CVE-2022-24801: HTTP Request Smuggling in twisted.web
First published: Mon Apr 04 2022(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: 1. The Content-Length header value could have a `+` or `-` prefix. 2. Illegal characters were permitted in chunked extensions, such as the LF (`\n`) character. 3. Chunk lengths, which are expressed in hexadecimal format, could have a prefix of `0x`. 4. 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. ### Impact You may be affected if: 1. You use Twisted Web's HTTP 1.1 server and/or proxy 2. You also pass requests through a different HTTP server and/or proxy The specifics of the other HTTP parser matter. The original report notes that some versions of Apache Traffic Server and HAProxy have been vulnerable in the past. HTTP request smuggling may be a serious concern if you use a proxy to perform request validation or access control. The Twisted Web client is not affected. The HTTP 2.0 server uses a different parser, so it is not affected. ### Patches The issue has been addressed in Twisted 22.4.0rc1 and later. ### Workarounds Other than upgrading Twisted, you could: * Ensure any vulnerabilities in upstream proxies have been addressed, such as by upgrading them * Filter malformed requests by other means, such as configuration of an upstream proxy ### Credits This issue was initially reported by [Zhang Zeyu](https://github.com/zeyu2001).
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Twistedmatrix Twisted | <22.4.0 | |
| Debian Debian Linux | =9.0 | |
| Fedoraproject Fedora | =35 | |
| Fedoraproject Fedora | =36 | |
| Oracle ZFS Storage Appliance Kit | =8.8 | |
| pip/twisted | <22.4.0 | 22.4.0 |
| Twisted Twisted | <22.4.0 |
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Reference Links
- https://github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043ac
- https://github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1
- https://github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqq
- https://lists.debian.org/debian-lts-announce/2022/05/msg00003.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
- https://nvd.nist.gov/vuln/detail/CVE-2022-24801
- https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2022-195.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6
- https://github.com/advisories/GHSA-c2jg-hw38-jrqq (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6
Frequently Asked Questions
What is CVE-2022-24801?
CVE-2022-24801 is a vulnerability in the Twisted Web HTTP 1.1 server that allows for non-conformant parsing of HTTP request constructs.
How does CVE-2022-24801 affect Twisted?
CVE-2022-24801 affects Twisted versions prior to 22.4.0rc1.
What is the severity of CVE-2022-24801?
CVE-2022-24801 has a severity rating of 8.1 (High).
How can I fix CVE-2022-24801?
To fix CVE-2022-24801, update your Twisted installation to version 22.4.0rc1 or newer.
Where can I find more information about CVE-2022-24801?
More information about CVE-2022-24801 can be found in the Twisted repository at the following links: [GitHub Commit](https://github.com/twisted/twisted/commit/592217e951363d60e9cd99c5bbfd23d4615043ac), [Release Tag](https://github.com/twisted/twisted/releases/tag/twisted-22.4.0rc1), [Security Advisory](https://github.com/twisted/twisted/security/advisories/GHSA-c2jg-hw38-jrqq).
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