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Python agent release notes

Release date: June 3, 2024

Language versions currently supported: Python 3.8 - 3.12

Bug fixes:

  • When handling an invalid multipart form data boundary, the agent logged an unnecessarily loud exception. (PYT-3118)

  • When the agent session ID was unset, agent findings were not sent correctly to Contrast. (PYT-3339)

  • When JIT compiling functions with numba, agent instrumentation would cause a ValueError. (PYT-3342)

Release date: May 30, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Support for reporting attack events to Syslog through local configuration. Accepting configuration via the UI will follow soon.

  • Improved performance for slicing, our most common propagation operation.

  • Significant performance improvements for stack trace generation.

  • Bump zipp from 3.18.1 to 3.18.2.

  • contrast-agent package now has an optional .[debug] variant. This currently includes experimental tracing tools to debug performance issues.

Bug fixes:

  • When accessing instrumented functions that are stored on class attributes, the agent throws exceptions. (PYT-3321)

Release date: May 20, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Updated agent-lib to the latest version.

  • Refactored route discovery and route observation to prepare for moving route discovery to a background thread.

  • Moved direct agent dependencies to a static file.

  • Sensitive data masking of application activity does not occur if there are no attacks.

  • When an application is instrumented with Contrast, route observation for expected response codes will be ignored.

  • Added deprecation warning for Python 3.8 support for EOL in October 2024.

  • Added framework to Route Discovery.

Bug fixes:

  • When instrumenting string some subclasses’ initialization, the agent could cause a RecursionError. (PYT-3295)

  • When calling enumfields.from_db_value, agent instrumentation caused unnecessary latency and CPU usage. (PYT-3321)

  • When the library reader processes distributions, the name is converted to all lowercase characters. (PYT-3326)

Release date: May 7, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Store dataflow event history as a graph instead of a list.

  • Removed PERMIT Protect rule mode.

  • Improved performance of import_patch.

Bug fixes:

  • When handling certain unexpected types, we were unable to convert strings to lowercase when sending data to Contrast. (PYT-3282)

Release date: April 25, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Startup communication between the Python Agent and Contrast has changed. As a result, EOP users must have EOP 3.11.2+ for Python Agent 8.0.0+. For EOP versions before 3.11.2, pin the agent dependency to 7.x. For example: pip install -U 'contrast-agent<8'.

  • Added error handling for possible AgentStartup 500 response.

  • Disabled funchook by default.

Bug fixes:

  • When Contrast Protect found an attack, a duplicate PROBE event was also sent to Contrast. (PYT-3255)

  • When handling certain unexpected types, Contrast Assess sometimes failed to propagate dataflow through rewritten operations. (PYT-3248)

  • When a non-str object was passed to an SQLi sink, Contrast Protect incorrectly threw an internal exception. (PYT-3228)

Release date: April 9, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Improved error message when contrast-python-run is not passed as a command.

  • Optimized rewrites.

  • Moved library discovery from first request to startup to improve response latency.

Bug fixes:

  • When the agent received a request with Unicode characters in the path, it would raise exceptions that interrupted reporting. (PYT-3134)

  • When the agent received a request with invalid utf-8 characters, it would raise exceptions that interrupted reporting. (PYT-3135)

  • When the agent instrumented Falcon apps that use Cython, some request properties were not tracked as sources. (PYT-3218)

  • When instrumenting exec and eval calls, different compiler flags were used, resulting in undefined names. (PYT-3250)

Release date: March 20, 2024

Language versions currently supported: Python 3.8 - 3.12

Bug fixes:

  • When analyzing a StaticFiles endpoint in a FastAPI app, the agent did not correctly record route information. (PYT-2917)

  • When using Gunicorn with gevent or eventlet, the runner instrumentation would cause a RecursionError. (PYT-3212)

Release date: March 14, 2024

Language versions currently supported: Python 3.8 - 3.12

Bug fixes:

  • When analyzing a request that led to a 404 response in Flask, Assess incorrectly reported a new Route. (PYT-3209)

Release date: March 8, 2024

Language versions currently supported: Python 3.8 - 3.12

Bug fixes:

  • When the application provided a relative Location response header, Contrast incorrectly converted the value to an absolute location. (PYT-3208)

Release date: February 22, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Added support for Django 4.2.x and 5.x.

  • Use agent-lib for SQLi infilter analysis.

  • Added release step for updating agent-operator-images.

  • Added support for Flask 3.x.

  • Opt of out telemetry in pipelines.

  • Make unit tests pass with integration test environment variables set.

  • Moved all dependabot config to dependabot.yml.

  • Optimized structlog utility headers.

  • Use agent-lib at cmdi infilter.

  • Use requests.Session to reuse HTTP connections from ReportingClient.

  • Verify support for escapeseq in Django 5.0.

  • Created all missing parent directories in agent.logger.path.

Bug fixes:

  • When analyzing non-HTML response bodies, Contrast Assess did not handle exceptions gracefully. (PYT-2870)

  • Fixed bad interaction between policy-based rewrites and patch policy. (PYT-3064)

  • When configured to use a proxy server, the agent prevented successful network configuration if the URL scheme of the proxy did not match the target server. (PYT-3189)

Release date: January 23, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Removed support for EOL frameworks Django 1, Django 2, Pyramid less than 1.10, Flask less than 1.0, Falcon less than 2.0.

  • Removed support for Python 3.7.

  • Automatically delete libcontrast logs after pytest run.

  • Utilized importlib.metadata in library reader patched state.

  • Added dependabot ignore for OpenAI.

  • Updated Teamserver URLs.

Bug fixes:

  • When aging off-tracked strings under heavy request load, the agent sometimes logged a KeyError. (PYT-3057)

  • When the agent was run with a virtual environment in the CWD, stack traces reported to the ContrastUI were not trimmed correctly. (PYT-3125)

  • When a Django application retrieved a user using a db-based session, Assess could incorrectly find an unsafe-code-execution vulnerability. (PYT-3165)

Release date: January 9, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Updated vendored importlib-metadata.

  • Updated structlog to latest version.

  • Updated test_fstring.py test_self_documenting_fstring_format to latest style.

  • Stabilized environment vars for loader.

  • Dependabot Update flask-sqlalchemy requirement to 3.1.

  • Added integration tests for api.certificate settings.

  • Updated / added support for sqlalchemy 2.0.

Release date: January 2, 2024

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • Stopped reporting library manifest on application update.

  • Removed support for:

    • Bottle versions earlier than 0.12

    • FastAPI versions earlier than 0.71.x

    • Falcon versions earlier than 3.0

    • Django versions earlier than 3.2

  • Port relevant code from importlib.metadata.

  • Utilize importlib.metadata in library reader catch-up analysis.

  • Allowed Assess and Protect concurrency.

  • Updated structlog dependency.

  • Updated Werkzeug to 3.0.

  • Use args and kwargs attributes on mock call objects instead of indexing.

  • Dependabot updated coverage requirement from ==7.2.* to ==7.3.*.

  • Updated Black to the latest version.

  • Bump typing-extensions dependency to latest version.

  • Remove code marked with py37.

Archive

Release date: November 30, 2023

Language versions currently supported: Python 3.8 - 3.12

New and improved:

  • End of support for language version 3.7.

  • Updated mysql-connector to the latest version.

Release date: November 29, 2023

Language versions currently supported: Python 3.7 - 3.12

New and improved:

  • Release of language version 3.12.

  • Added the reporting of active configuration and source of the settings.

  • Added support for agent.logger.stdout in the common configuration.

  • Enabled sys.monitoring INSTRUCTION-level events.

  • We no longer throw an exception when trying to log effective config to disk when agent log path is set to STDOUT.

Release date: November 21, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Updated hardcoded key list to exclude SCHEMA.

Bug fixes:

  • When instrumenting a Django application with manual middleware installation, the agent did not automatically discover routes. (PYT-3085)

Release date: November 17, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When running Assess in a Django application, the agent incorrectly marked the URL scheme as a source of untrusted data. (PYT-3082)

Release date: October 18, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When a normal static resource is accessed in FastAPI, the agent reports PathTraversal. (PYT-3021)

  • When analyzing requests in Assess mode, the agent caused a memory leak. (PYT-3050)

Release date: October 11, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Updated logging to use the latest standard for getting thread ID and improved logged message with non-JSON response from Contrast.

Bug fixes:

  • When using Genshi with the Contrast Runner, the agent caused an exception if % appeared in a template. (PYT-3005)

  • When lxml.etree.fromstring was called with a known safe parser, Assess incorrectly reported an XXE vulnerability. (PYT-3013)

Release date: September 7, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Removed the deprecated attack timing feature from Protect.

  • Swap ApplicationProxies for function_wrappers.

  • Updated URL normalization of request data based on specification.

  • Created detailed help message for Agent Runner.

  • Added propagation policy for pathlib.

  • Configuration logged to disk after startup.

  • Logging of a failing runtime connection result.

Bug fixes:

  • Fix anyio pinned version for old FastAPI framework test. (PYT-3001)

  • When CacheControlsRule exceptions are present the agent still reports Anti-Caching Controls vulnerability. (PYT-2997)

  • Fixed warnings in unit test suite: "Directory not empty": Attempt #2. (PYT-2996)

Release date: August 14, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Release of Contrast Runner, a new command-line interface for instrumenting Python applications.

  • Removed the deprecated_middleware module and all associated code.

  • Policy-based rewrites are now applied immediately after registering the rewriter in the runner.

  • String hooks are now applied early enough in environments where funchook is not enabled.

  • Bump ruamel-yaml dependency to latest version.

  • Added ssrf trigger policy for requests library.

  • Added a deprecation warning when using specific middleware classes.

  • Added support for the latest FastAPI (0.96.*).

  • Added the agent.python.enable_automatic_middleware configuration option to disable automatic middleware instrumentation.

  • Enabled error-free installation on M1/arm architecture.

  • Removed policy-based rewrites (including hidden configuration option) and added propagation policy for posixpath.

  • Bump typing-extensions dependency to latest version.

  • Implemented automatic instrumentation for middleware AIOHTTP, Bottle, Falcon (ASGI), Falcon (WSGI), FastAPI, Flask, Pyramid, Quart.

  • Removed JSON policy, contrast.agent.policy.loader and any associated unused code.

  • Removed trace logging.

  • Updated propagation policy for builtins module.

  • Added propagation policy for genericpath module.

  • Added/updated propagation policy for _codecs module.

  • Updated contrast.__init__ to directly use pkg_resources.

  • Removed Django-specific middleware (ASGI and WSGI), Falcon-specific middleware (ASGI and WSGI), and Pyramid-specific middleware.

  • Removed Protect response overwrite.

Bug fixes:

  • When Protect reports an attack coming from HTTP form data, the source is incorrectly listed as query string has been resolved. (PYT-2974)

  • Fixed the vulnpy pipeline. (PYT-2955)

  • Fixed quart auto-instrumentation for app.run(). (PYT-2929)

  • Fix to automatically instrument flask apps that are started with the dev server using app.run(). (PYT-2918)

  • Fixed AttributeError: BoundLogger object has no attribute trace. (PYT-2790)

Release date: August 4, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Implemented a prompt-injection trigger policy for the OpenAI API.

Release date: July 26, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Added the api.certificate.ignore_cert_errors configuration option for ignoring certification errors.

Release date: July 26, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Added deprecation warning for Python 3.7 support.

  • Revisited the use of setuptools-scm for versioning.

Release date: June 27, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • Agent crashes when non-string is passed to _evaluate_body_json. (PYT-2930)

Release date: May 31, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When telemetry is enabled and the connection fails, the agent blocks the main application thread. (PYT-2872)

Release date: May 25, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Updated instrumentation to avoid errors in certain edge cases.

Release date: May 16, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Removed trailing slashes from configured Contrast API URL.

Release date: May 15, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When using the rewriter with an instrumented application that uses Pandas, an exception occurs. (PYT-2856)

Release date: May 11, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When the ASGI scope contained a client value of None, the agent raised an exception during source tracking. (PYT-2853)

Release date: May 9, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Updated PyPI deploy action.

  • Moved agent initialization out of runner and back into middleware.

  • Add integration test for Assess dataflow using runner with uwsgi.

  • Bump typing-extensions dependency to the latest version.

  • Bump ruamel-yaml dependency to the latest version.

  • Bump isort dependency to the latest version.

  • Bump structlog dependency to latest version.

  • Moved all packages in contrast.extern to new contrast_vendor package.

  • Removed flask-specific middleware.

  • Automatic middleware hooks now set and log the detected framework.

  • Removed fastAPI-specific middleware.

  • Added policy for urllib.parse propagators and sanitizers.

Bug fixes:

  • When the ASGI scope contained a client value of None, the agent raised an exception. (PYT-2850)

  • When running in Protect mode, the agent incorrectly identified normal header values as attacks. (PYT-2834)

  • When processing an HTTP 1.1 chunked response, the agent prevents the entire response from being sent to the client. (PYT-2822)

  • When analyzing certain objects with custom __bool__ implementations, the agent raised an exception. (PYT-2757)

  • When performing Assess analysis, the agent occasionally failed to correctly determine if an unknown object was iterable. (PYT-2756)

Release date: April 25, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When processing certain JSON request bodies, Contrast Protect did not correctly adjust input types before performing analysis. (PYT-2824)

  • When analyzing mysql-connector installations missing a C extension, Contrast Assess failed to instrument the entire library. (PYT-2820)

Release date: April 21, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • Fixed issue when using the agent in a Python 3.7 environment that does not have typing-extensions installed, the agent logger raises an exception. (PYT-2814)

Release date: April 11, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Removed all bottle-specific logic from BottleMiddleware.

  • Updated RuntimeError in setup.py to include a workaround for aarch/arm systems.

  • Removed quart-specific middleware.

  • Added a lock for agent state initialization.

  • Added support for the latest FastAPI (0.93.*).

  • Changed the AgentLib log level.

  • Integrated the Protect Library.

Bug fixes:

  • Fixed AttributeError: Constant object had no elts attribute. (PYT-2740)

  • Fixed UnicodeDecodeError: utf-8 codec could not decode byte 0xff in position 0: invalid start byte. (PYT-2725)

  • Fixed TypeError: module, class, method, function, traceback, frame, or code object was expected, got partial. (PYT-2664)

  • Fixed SystemError: <built-in function in_scope> returned a result with an error set. (PYT-2659)

  • Fixed flaky pipeline step for server activity. No more flaky failures in flask-agent-direct-teamserver-response. (PYT-2651)

Release date: March 30, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When trying to identify the current platform on startup, the agent raised an exception. (PYT-2777)

Release date: March 20, 2023

Language versions currently supported: Python 3.7 - 3.11

Bug fixes:

  • When instrumenting Bottle and Falcon applications, middlewares closer to the application than ContrastMiddleware were bypassed. (PYT-2727)

Release date: March 15, 2023

Language versions currently supported: Python 3.7 - 3.11

New and improved:

  • Upgraded externed wrapt from 1.14.1 to 1.15.0.

  • Upgraded agent-lib to 0.5.2

  • Added propagation policy for posixpath (os.path)

  • Bump pinned version of contrast-agent-lib to v0.4.0

  • Updated copywrite message

  • Removed the bypass option for messages

  • Updated flask-sqlalchemy to 3.0.*

  • Added support for Quart 0.18 / Werkzeug 2.2

  • When app server exits, Telemetry will send any messages in queue

  • Deprecated SR

  • Added support for Python 3.11

Bug fixes:

  • AttributeError: 'Settings' object has no attribute 'last_update_service'. (PYT-2563)

  • AttributeError: 'NoneType' object has no attribute 'disabled_assess_rules'. (PYT-2559)

  • AttributeError: 'NoneType' object has no attribute 'reportable_format'. (PYT-2552)

Release date: March 15, 2023

Language versions currently supported: Python 3.7 - 3.10

No updates

Release date: March 13, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When the regex split result contains None, an exception occurs in the propagator. (PYT-2644)

  • When unicode-escape is used as encoding, LookupError occurs in path-traversal sink. (PYT-2553)

Release date: March 9, 2023

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Bump contrast-agent-lib version to 0.5.2.

Release date: March 1, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When too many assess regex propagation events occurred in a single request, the agent continued to propagate regardless of assess.max_propagation_events. (PYT-2676)

Release date: February 15, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When evaluating the protect deserialization rule for pickled data, the agent easily found false positives. (PYT-2646)

Release date: January 23, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When performing Django's safe_join on a PosixPath object, the agent raised a TypeError. (PYT-2592)

Release date: January 18, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When the Contrast Service was too slow to start on server startup, the Agent failed to instrument the application. (PYT-2582)

Release date: January 11, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When the agent failed to connect to the Contrast Service, it raised an AttributeError when handling the first request to the application. (PYT-2574)

Release date: January 6, 2023

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When untrusted data was safely passed to subprocess functions using shell=False, the agent incorrectly reported a command injection vulnerability. (PYT-2557)

Release date: November 17, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Added support for URL exclusions when communicating directly with Contrast.

  • Added configuration support for input exclusions directly from Contrast.

  • Integrated AgentLib Request End for contrast_c::check_cmd_injection_query

  • Upgraded externed typing extensions to latest version.

Bug fixes:

  • When ASGI websocket endpoints are used with the agent enabled, the app crashes. (PYT-2517)

Release date: October 31, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When starting the Contrast Service without a path, the Agent defaults to STDOUT rather than the default file path. (PYT-2505)

  • Reduced frequency of server activity messages. (PYT-2484)

Release date: October 19, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When attempting to rewrite the target of an append, the agent incorrectly passes self rather than the original Attribute. (PYT-2496)

Release date: October 18, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Added support for FastAPI 0.85. (PYT-2456)

  • Implemented PII masking in the agent. (PYT-2462)

  • Added a CONTRAST__AGENT__PYTHON__REWRITE option that disables rewriting. (PYT-2485)

Release date: October 3, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When running the agent, getting specifications in rewriter throws AttributeError. (PYT-2480)

Release date: September 28, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When running the agent, rewriter cannot find specifications path. (PYT-2476)

Release date: September 21, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • Fixed issue for when an agent receives a websocket request and a KeyError was returned. (PYT-2470)

Release date: September 20, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • Fixed issue where an application instrumented with the agent in an environment without lxml installed crashed. (PYT-2464)

Release date: September 1, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Falcon ASGI support is now available in Python agent 5.14.0.

  • Added support for Django 4.

Bug fixes:

  • When attempting to rewrite code for instrumentation, certain code patterns result in infinite loops, resulting in application crashes. (PYT-2444)

Release date: July 11, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When agent.service.logger was configured to log to an unwritable path, the Contrast Service wrote DEBUG logs to stdout regardless of the configured log level.

Release date: June 21, 2022

Language versions currently supported: Python 3.7 - 3.10

Release date: June 13, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When sampling settings are translated from Contrast, a String vs Enum mismatch causes them to be improperly applied. (PYT-2286)

  • When sqli protect rule isn't enabled, a NoneType error is logged (Telemetry-reported Error). (PYT-2311)

Release date: June 7, 2022

Language versions currently supported: Python 3.7 - 3.10

Release date: May 30, 2022

Language versions currently supported: Python 3.7 - 3.10

Release date: May 27, 2022

Language versions currently supported: Python 3.7 - 3.10

Release date: May 25, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Telemetry exceptions - production issues from live customer environments will be reported to our servers to help remediate bugs.

Release date: April 14, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Expanded FastAPI support to version 0.75.*.

Bug fixes:

  • When assess configuration specifies sampling.baseline, the agent incorrectly analyzes fewer baseline requests than expected. (PYT-2238)

Release date: April 11, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When an assess-instrumented function throws any exception, the agent logs it at ERROR level even when recoverable. (PYT-2234)

Release date: April 7, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Modified the agent to better support asynchronous functionality added by event.

Release date: April 5, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Introduction of the Assess Sampling feature to facilitate performance tuning.

Bug fixes:

  • When a Django request's path is missing a required "/", the agent does not mark the route as observed. (PYT-2222)

Release date: March 30, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When Django creates a redirect response to append a trailing "/" to the URL path, the agent incorrectly finds an unvalidated redirect (PYT-2218)

Release date: March 28, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When the agent encounters an issue during assess dataflow tracking, an error level, rather than debug, log message is created, potentially filling log tools. (PYT-2196)

Release date: March 23, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When processing a request without a context, a missing None check results in an AttributeError. (PYT-2168)

  • When Protect is disabled either locally or in Contrast, the agent disables it. (PYT-2186)

Release date: March 16, 2022

Language versions currently supported: Python 3.7 - 3.10

Bug fixes:

  • When a Django app serves a jinja template, the agent consumes the response (PYT-2166)

  • When an aiohttp application in Protect mode receives a ContrastServiceException, an error that crashed the app occurs (PYT-2167)

  • When an aiohttp, Fastapi, or Bottle app is onboarded, an incorrect framework name is reported (PYT-2171)

Release date: March 1, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • The Python agent now supports FastAPI 0.74.

Release date: February 16, 2022

Language versions currently supported: Python 3.7 - 3.10

New and improved:

  • Added web application framework support for AioHttp.

Release date: February 11, 2022

Language versions currently supported: Python 3.7 - 3.9

New and improved:

  • Support for asynchronous web application framework - AioHTTP.

Release date: February 1, 2022

Language versions currently supported: Python 3.7 - 3.9

Bug fixes:

  • When a protect-instrumented method receives non-UTF-8 encoded bytes, the agent fails to perform protect analysis. (PYT-2028)

Release date: January 13, 2022

Language versions currently supported: Python 3.7 - 3.9

Bug fixes:

  • When an application calls an instrumented method with a keyword-argument named "self", the agent throws an exception. (PYT-1998)

Release date: January 7, 2022

Language versions currently supported: Python 3.7 - 3.9

Note

Python versions 2.7.X, 3.5.X and 3.6.X are no longer supported after the Python agent 4.14.3.

Release date: December 15, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Note

Python versions 2.7.X, 3.5.X and 3.6.X are no longer supported after the Python agent 4.14.3.

Release date: December 6, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Bug fixes:

  • When handling many concurrent requests in Protect mode, the agent failed to perform path-traversal postfilter analysis. (PYT-1964)

Release date: November 30, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Note

As of Python 4.14.1, the agent will be bundled with Contrast Service version 2.27.2.

Release date: November 23, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Expanded web application framework support for Pyramid 2.

  • Telemetry is now enabled in the Python agent in order to gather valuable data about the agent’s functionality. The data is all anonymous, no personal information is collected.

Release date: November 18, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • We no longer report vulnerabilities when the value of url_scheme is used in a trigger.

  • The Python agent now supports the web framework FastAPI.

Release date: October 21, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Expanded web server support for uWSGI.

  • Expanded web server support for gUnicorn.

  • Expanded web server support for Uvicorn.

  • Architectural improvements for propagation and associated extension hooks.

Release date: September 16, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Bug fixes:

  • When the agent was installed in Python 2.7, the latest version of the protobuf dependency caused agent startup failure as it dropped support for older Python versions. (PYT-1757)

Release date: September 1, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Bug fixes:

  • When a Bottle or Django app received a request with certain encoded chars in the path, the agent raised a UnicodeEncodeError. (PYT-1742)

Release date: August 24, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Implemented event limit specifications to improve performance.

Bug fixes:

  • When the agent tried to detect the application framework, it always picked the default one. (PYT-1707)

Release date: July 29, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Performance improvements from refactoring and other optimizations.

Release date: July 8, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Bug fixes:

  • When a framework test was executed in an environment in which the agent was installed, then load ordering between the test code and agent code causes an inability to track some objects. (PYT-1574)

Release date: July 1, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Remove specific support of the Pylons framework given its merger with the Pyramid framework.

  • Expand support of the Flask framework to include the new 2.X major version.

Bug fixes:

  • When a vulnerability payload is too large, TeamServer cannot process the finding and rejects it. (PYT-1488)

Release date: May 21, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Added support for built-in sanitization and validation in the Falcon 2.X and Pyramid Web Application Frameworks to improve vulnerability detection when Assess is enabled.

  • The agent now reports all dependencies used by the application, even those without Python files.

  • The agent now supports TRACE level logging to assist with diagnostic investigations.

  • The agent has been refactored to provide performance improvement during vulnerability detection and reporting when Assess is enabled.

  • The agent now supports MarkupSafe 2.0 as used for cross-site scripting (XSS) vulnerability protection when observing data flow when Assess is enabled.

Release date: April 28, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Bug fixes:

  • When customer uploads large file to instrumented falcon route, agent performs too much analysis, causing request to fail to complete. (PYT-1476)

Release date: April 21, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Important note:

  • The Python agent now supports the web framework Bottle.

New and improved:

  • Incremental changes were made to reduce memory usage when Assess is enabled.

  • Added Assess support through pathlib.Path objects.

  • Pycassa library is no longer supported by the agent.

  • Added additional Assess support for Command Injection vulnerabilities in os and subprocess modules.

  • Added additional Assess support for marshal and shelve modules.

  • Added additional Assess support for Path Traversal vulnerabilities in os, pathlib, and shutil modules.

  • Added os.path.basename as sanitizer for Path Traversal.

Bug fixes:

  • When propagating through string methods with the KEEP action, Assess fails internally on length - 1 return values. (PYT-1466)

  • When running Assess on some alpine docker containers, the agent fails to instrument string methods, preventing application startup. (PYT-1450)

Release date: March 25, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • The agent now propagates through str multiplication.

  • The PyramidMiddleware is now a WSGI-based middleware.

  • User input that is later encoded as Base64 will now have proper dataflow context.

Bug fixes:

  • When attempting to instrument strings in Assess, not enough memory is allocated in some environments. (PYT-1350)

Release date: March 16, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Refactored the patch manager for better instrumentation.

  • The agent will now fully shutdown if told to do so by the service.

  • Improved agent startup time and memory usage when Assess is enabled.

  • The agent now reports its effective instrumentation mode to the service.

  • Upgraded bundled service in the agent to the latest version.

Bug fixes:

  • When casting an object with a __str__ method to a non-str, the agent would lose propagation through the cast propagator. (PYT-1312)

  • When trying to instrument an application using SQLAlchemy, an error would be thrown if MySQLdb had no attribute called Cursor. (PYT-1332)

  • When trying to retrieve properties for an object, exceptions could be thrown if the agent attempted retrieval in an unsafe manner. (PYT-1333)

Release date: February 25, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Refactored the agent's approach for handling objects with attached properties.

  • Updated Django support to prevent over tagging of path values within a request.

  • Upgraded service version bundled within the agent.

  • Updated dataflow action to prevent potentially unsafe propagation of tags.

Bug fixes:

  • When reporting a vulnerability while using legacy Django middleware, the agent would not run its final tasks if a trigger raises an error. (PYT-1257)

  • When trying to track dataflow through an action on a bytes object, the agent could fail. (PYT-1281)

Release date: February 5, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Bug fixes:

  • When trying to format to lowercase hex, the format propagator would fail. We fixed this edge case. (PYT-1227)

Release date: January 29, 2021

Language versions currently supported: Python 2.7 and 3.5 - 3.9

Important note:

  • Support for Python 2.7 will be deprecated in 2021.

New and improved:

  • Added support for the Assess ReDoS rule.

  • Reduced the calls to retrieving Python loaded modules to improve performance.

  • Improved representation of dataflow with events containing keyword arguments.

Bug fixes:

  • The agent failed to process GET requests when handing user input from requests containing non-UTF-8 strings. Updated string handling to account for this. (PYT-1242)

  • When users uploaded files in a Flask application, the amount of resultant dataflow events in internal web framework code caused significant performance degradation. Given the lack of risk fo exploitation with this method, we expanded ignored methods for Flask, preventing these events and subsequent degradation. (PYT-1247)

Release date: December 17, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.9

New and improved:

  • Added support for Python 3.9.

  • Agent does not unpack method arguments when passing them into Assess rules.

  • Agent now ignores .so files from loaded modules when patching.

  • Added route coverage support for DjangoRestFramework routers.

  • Added capability of deadzoning methods to improve accuracy.

  • Assess stacktraces can now be configured with assess.stacktraces.

  • Corrected possible string tracker age off KeyError on key deletion.

Release date: November 20, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Bug fixes:

  • Service and agent were using different environment variable to set the config.path. Updated CONTRAST_CONFIG_PATH value parsing to look for a file and not a directory with the YAML file. (SUP-2257, PYT-1161)

Release date: November 20, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

New and improved:

  • Added additional debug logging on request start and finish.

  • Improved library analysis support to include parsing SOURCES.txt.

  • Updated timing of logging of the environment of an application.

  • Added logging of configuration values on any logger change.

  • Fixed propagation scope leak for generators.

Bug fixes:

  • Agent crashed in a scenario where free() could be called twice because of patching by Gevent.. (PYT-1164)

Release date: November 4, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

New and improved:

  • The agent now reports enhanced library usage on startup and at the end of each request. After a request is received by the agent, we report new files loaded for an installed package.

  • The agent will not report unsupported distribution types for packages.

  • Updated the heartbeat thread to no longer accidentally propagate and cause an error.

Release date: October 28, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

New and improved:

  • Added configurable Django Rest Framework (DRF) response-rendering deadzone to fix timeout errors in DRF applications.

Release date: October 23, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

New and improved:

  • Improved NoSQL Injection support for Assess and Protect.

  • NoSQLi now handles MongoDB ObjectID types.

  • Added html.escape as a sanitizer in Assess.

  • Added WARN level logging if the configuration required to connect to the Contrast Service is missing.

  • Added INFO level configuration state logging, including ENV and YAML values.

  • Added YAML validation and, if invalid syntax is detected, WARN level logging indicating such.

  • Added INFO level application identification logging

  • Removed strict compiler flags from extension build.

  • Reduced latency in Django Rest Framework's response handling.

  • Investigated excessive DB_WRITE propagation.

Release date: October 5, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Bug fixes:

  • Failed to repatch module due to __dict__ changing size while iterating over it. (PYT-1085)

Release date: September 21, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Bug fixes:

  • Inability to patch held references to older versions of modules prevents instrumentation of referenced, rather than directly invoked, methods, such as in Werkzeug version 0.16.0.

Release date: September 17, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

New and improved:

  • Added support for Assess rules:

    • HttpOnly cookie flag disabled

    • Session cookie has no secure flag

    • Overly long session timeout

    • XPath injection rule

    • Trust boundary violation rules in Django, Flask, Pyramid and Pylons

  • Removed HTTP request methods as a dataflow source.

  • Added support for Assess configurations assess.enable_scan_response and assess.rules.disabled_rules.

Release date: September 1, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Bug fixes:

  • Unable to instrument applications on OSX using locally built Python versions due to maxprot setting. (PYT-1025)

Release date: August 31, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Bug fixes:

  • Hardcoded analysis rules were accidentally disabled. (PYT-1027)

Release date: August 25, 2020

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Bug fixes:

  • When the agent was disabled, attempting to start without the Contrast service, resulted in application crash in Flask applications. (PYT-1012)

Release date: August 24, 2020

Language versions currently supported: Python 2.7 and 3.5-3.8

New features and improvements:

  • Instrument compile as part of the Unsafe Code Execution rule.

  • Decouple ServiceClient from SettingsState

  • Use normalized_response_headers in DTM instead of response_headers.

  • Refactored XSS postfilter logic for checking allowed content type.

  • Updated MongoDB update_methods to account for all arguments.

  • Replaced FlowMap Technology Analysis.

  • Verifed that SR handles empty observed route url.

  • Merge all rules apply_rule into one implementation.

  • Do not report handled exceptions in INFO/ERROR logs

  • Upgraded Python agent to use SR 2.11.x.

Bug fixes:

  • Fix and update regex used for protect XXE rule (PYT-94)

  • Fix error in DB write propagator. (PYT-971)

  • Agent fails to identify itself with new SR instance after the original SR instance goes down. (PYT-715)

Language versions currently supported: Python 2.7 and 3.5-3.8

Bug fixes:

  • List pip and pkg_resources as dependencies and/or include as external modules. (PYT-974)

Language versions currently supported: Python 2.7 and 3.5-3.8

Bug fixes:

  • Do not report observed route if signature is missing/empty. (PYT-970)

Language versions currently supported: Python 2.7 and 3.5-3.8

Agent versions released during the past month: 3.0.1, 3.1.0, 3.1.1, 3.1.2, 3.2.0

New features and improvements:

  • Added route coverage support for Django 3.0.

  • Added Falcon 2.0 support.

  • Improved accuracy of library file usage.

  • Improved propagation through regular expressions in Assess.

Important notes:

  • The team made significant internal cleanup to Request representation

Bug fixes:

  • Fixed a bug where regex propagation was throwing an exception under certain conditions.

  • Fixed a bug related to agent handling of very short JSON keys and values.

  • Updated protobuf dependency requirement in response to incompatibility issues with older versions.

  • Fixed an issue where the agent raised an internal exception for applications using certain features of pyasn1.

  • Fixed a bug where Django applications were unable to properly parse the Content-Type header if a charset was explicitly provided.

  • Improved error handling around stack trace construction.

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Agent versions released during the past month: 2.10.0

New features and improvements:

  • Falcon 2.0 is supported and is in beta

  • Upgraded Contrast Service to 2.8.1

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Agent versions released during the past month: 2.10.0

New features and improvements:

  • Added support for Django Rest Framework

  • Added copyright to all agent files

  • Removed the agent's external dependency on the wrapt package

  • Improved INFO level logging for easier tracking of applications with multiple processes

Bug fixes:

  • When running the agent with protobuf-3.6.1 sometimes the application crashed, which has now been resolved with a newer protobuf version.

Language versions currently supported: Python 2.7 and 3.5 - 3.8

Agent versions released during the past month: 2.8.1, 2.8.2, 2.8.3, 2.9.0

New features and improvements:

  • Added initial support for Stored XSS rule in Assess for django framework.

  • Added Unvalidated Redirect support for Assess for pyramid and webob objects.

  • Made updates to reduce number of false positives from Reflected XSS rule in Assess.

  • Removed the agent’s external dependency on the six package.

Bug fixes:

  • When running the agent under Python 2.7 on Ubuntu 16.10 some instrumentation failed to apply, which has now been resolved.

  • When applications used str.format in certain edge cases, the agent lost dataflow propagation, which has now been resolved.