CVE-2022-21716
Description
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 22.2.0, Twisted SSH client and server implement is able to accept an infinite amount of data for the peer's SSH version identifier. This ends up with a buffer using all the available memory. The attach is a simple as `nc -rv localhost 22 < /dev/zero`. A patch is available in version 22.2.0. There are currently no known workarounds.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | affected | | |
| sles | affected | | |
| debian | bookworm | fixed | 22.2.0-1 |
| debian | bullseye | fixed | 20.3.0-7+deb11u1 |
| debian | forky | fixed | 22.2.0-1 |
| debian | sid | fixed | 22.2.0-1 |
| debian | trixie | fixed | 22.2.0-1 |
References
- https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
- https://nvd.nist.gov/vuln/detail/CVE-2022-21716
- https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9
- https://github.com/twisted/twisted/commit/98387b39e9f0b21462f6abc7a1325dc370fcdeb1
- https://github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2022-160.yaml
- https://github.com/twisted/twisted
- https://github.com/twisted/twisted/releases/tag/twisted-22.2.0
- https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html
- 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
- 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://security.gentoo.org/glsa/202301-02
- https://twistedmatrix.com/trac/ticket/10284
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.suse.com/security/cve/CVE-2022-21716.html
- https://security-tracker.debian.org/tracker/CVE-2022-21716
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.