CVE-2022-21716 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9 https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx https://twistedmatrix.com/trac/ticket/10284 https://github.com/twisted/twisted/releases/tag/twisted-22.2.0 https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html https://www.oracle.com/security-alerts/cpuapr2022.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5