CVE-2022-21716 – twisted

Package

Manager: pip
Name: twisted
Vulnerable Version: >=21.7.0 <22.2.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: 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

EPSS: 0.00966 pctl0.75683

Details

Twisted SSH client and server deny of service during SSH handshake. ### Impact 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`. ### Patches The issue was fix in GitHub commit https://github.com/twisted/twisted/commit/98387b39e9f0b21462f6abc7a1325dc370fcdeb1 A fix is available in Twisted 22.2.0. ### Workarounds * Limit access to the SSH server only to trusted source IP addresses. * Connect over SSH only to trusted destination IP addresses. ### References Reported at https://twistedmatrix.com/trac/ticket/10284 Discussions at https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx ### For more information Found by vin01

Metadata

Created: 2022-03-03T19:02:08Z
Modified: 2024-11-25T18:33:22Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-rv6r-3f5q-9rgx/GHSA-rv6r-3f5q-9rgx.json
CWE IDs: ["CWE-120", "CWE-770"]
Alternative ID: GHSA-rv6r-3f5q-9rgx
Finding: F002
Auto approve: 1