CVE-2022-24801: Inconsistent Interpretation of HTTP Requests in twisted.web
(updated )
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:
- The Content-Length header value could have a
+or-prefix. - Illegal characters were permitted in chunked extensions, such as the LF (
\n) character. - Chunk lengths, which are expressed in hexadecimal format, could have a prefix of
0x. - HTTP headers were stripped of all leading and trailing ASCII whitespace, rather than only space and HTAB (
\t).
This non-conformant parsing can lead to desync if requests pass through multiple HTTP parsers, potentially resulting in HTTP request smuggling.
References
- github.com/advisories/GHSA-c2jg-hw38-jrqq
- github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2022-195.yaml
- github.com/twisted/twisted
- github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043ac
- github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1
- github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqq
- lists.debian.org/debian-lts-announce/2022/05/msg00003.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6
- nvd.nist.gov/vuln/detail/CVE-2022-24801
- www.oracle.com/security-alerts/cpujul2022.html
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