Python agent release notes

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.

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.

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.

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)

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

Implemented event limit specifications to improve performance.

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

Performance improvements from refactoring and other optimizations.

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)

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.

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

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.

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

The Python agent now supports the web framework Bottle.

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.

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)

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.

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

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.

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)

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.

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)

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

Support for Python 2.7 will be deprecated in 2021.

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.

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)

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.

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)

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.

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

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.

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

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.

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

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.

Added support for Assess rules:

Removed HTTP request methods as a dataflow source.

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

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

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

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

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.

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)

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

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

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.

The team made significant internal cleanup to Request representation

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.

Falcon 2.0 is supported and is in beta

Upgraded Contrast Service to 2.8.1

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

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

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.

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.