CVE-2022-24801

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.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1009030&gt;

Notes