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Debian LTS Advisory DLA-2927-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                      Sylvain Beucler
February 19, 2022                             https://wiki.debian.org/LTS
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Package        : twisted
Version        : 16.6.0-2+deb9u1
CVE ID         : CVE-2020-10108 CVE-2020-10109 CVE-2022-21712
Debian Bug     : 953950

It was discovered that Twisted, a Python event-based framework for
internet applications, is affected by HTTP request splitting
vulnerabilities, and may expose sensitive data when following
redirects. An attacker may bypass validation checks and retrieve
credentials.

CVE-2020-10108

    HTTP request splitting vulnerability. When presented with two
    content-length headers, it ignored the first header. When the
    second content-length value was set to zero, the request body was
    interpreted as a pipelined request.

CVE-2020-10109

    HTTP request splitting vulnerability. When presented with a
    content-length and a chunked encoding header, the content-length
    took precedence and the remainder of the request body was
    interpreted as a pipelined request.

CVE-2022-21712

    Twisted exposes cookies and authorization headers when following
    cross-origin redirects. This issue is present in the
    `twisted.web.RedirectAgent` and
    `twisted.web.BrowserLikeRedirectAgent` functions.

For Debian 9 stretch, these problems have been fixed in version
16.6.0-2+deb9u1.

We recommend that you upgrade your twisted packages.

For the detailed security status of twisted please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/twisted

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS