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PYSEC-2022-195

Description

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to version 22.4.0rc1, the Twisted Web HTTP 1.1 server, located in the `twisted.web.http` module, parsed several HTTP request constructs more leniently than permitted by RFC 7230. This non-conformant parsing can lead to desync if requests pass through multiple HTTP parsers, potentially resulting in HTTP request smuggling. Users who may be affected use Twisted Web's HTTP 1.1 server and/or proxy and also pass requests through a different HTTP server and/or proxy. The Twisted Web client is not affected. The HTTP 2.0 server uses a different parser, so it is not affected. The issue has been addressed in Twisted 22.4.0rc1. Two workarounds are available: Ensure any vulnerabilities in upstream proxies have been addressed, such as by upgrading them; or filter malformed requests by other means, such as configuration of an upstream proxy.


Affected Software


CPE Name Name Version
twisted 2.4.0
twisted 22.2.0rc1
twisted 19.2.0
twisted 21.7.0rc3
twisted 20.3.0rc1
twisted 10.1.0
twisted 16.6.0
twisted 15.2.0
twisted 19.7.0
twisted 16.7.0rc2
twisted 18.4.0
twisted 19.2.1
twisted 16.4.0
twisted 8.0.1
twisted 19.10.0
twisted 16.2.0
twisted 10.2.0
twisted 14.0.1
twisted 1.0.6
twisted 19.2.0rc1
twisted 11.0.0
twisted 16.5.0rc2
twisted 1.2.0
twisted 19.7.0rc1
twisted 21.7.0rc1
twisted 21.2.0rc1
twisted 19.10.0rc1
twisted 17.5.0
twisted 12.1.0
twisted 19.2.0rc2
twisted 18.7.0rc1
twisted 1.0.4
twisted 15.4.0
twisted 16.3.2
twisted 9.0.0
twisted 15.5.0
twisted 16.7.0rc1
twisted 16.4.1
twisted 20.3.0
twisted 16.1.1
twisted 1.0.1
twisted 17.9.0rc1
twisted 21.7.0rc2
twisted 18.9.0
twisted 15.0.0
twisted 22.1.0
twisted 18.9.0rc1
twisted 1.1.0
twisted 1.0.3
twisted 18.7.0
twisted 14.0.2
twisted 21.2.0
twisted 1.0.5
twisted 15.1.0
twisted 22.4.0rc1
twisted 17.1.0
twisted 17.9.0
twisted 14.0.0
twisted 16.1.0
twisted 18.4.0rc1
twisted 15.2.1
twisted 2.5.0
twisted 18.7.0rc2
twisted 15.3.0
twisted 16.6.0rc1
twisted 17.1.0rc1
twisted 8.0.0
twisted 13.1.0
twisted 22.2.0
twisted 21.7.0
twisted 13.0.0
twisted 1.0.7
twisted 16.0.0
twisted 16.5.0
twisted 8.2.0
twisted 8.1.0
twisted 16.3.0
twisted 10.0.0
twisted 1.1.1
twisted 12.3.0
twisted 2.1.0
twisted 16.3.1
twisted 12.2.0
twisted 12.0.0
twisted 13.2.0
twisted 22.1.0rc1
twisted 16.5.0rc1
twisted 11.1.0

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