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.
https://www.oracle.com/security-alerts/cpuapr2022.html
https://twistedmatrix.com/trac/ticket/10284
https://security.gentoo.org/glsa/202301-02
https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html
https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
https://github.com/twisted/twisted/releases/tag/twisted-22.2.0
https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9
Published: 2022-03-03
Updated: 2024-11-25
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: High
Base Score: 8.7
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Severity: High