CVE-2022-21716: Twisted SSH client and server deny of service during SSH handshake.
(updated )
The Twisted SSH client and server implementation naively accepted an infinite amount of data for the peer’s SSH version identifier.
A malicious peer can trivially craft a request that uses all available memory and crash the server, resulting in denial of service. The attack is as simple as nc -rv localhost 22 < /dev/zero.
References
- github.com/advisories/GHSA-rv6r-3f5q-9rgx
- github.com/pypa/advisory-database/tree/main/vulns/twisted/PYSEC-2022-160.yaml
- github.com/twisted/twisted
- github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9
- github.com/twisted/twisted/commit/98387b39e9f0b21462f6abc7a1325dc370fcdeb1
- github.com/twisted/twisted/releases/tag/twisted-22.2.0
- github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
- lists.debian.org/debian-lts-announce/2022/03/msg00009.html
- 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-2022-21716
- security.gentoo.org/glsa/202301-02
- twistedmatrix.com/trac/ticket/10284
- www.oracle.com/security-alerts/cpuapr2022.html
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