GHSA-rv6r-3f5q-9rgx
Suggest an improvement- Source
- https://github.com/advisories/GHSA-rv6r-3f5q-9rgx
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-rv6r-3f5q-9rgx/GHSA-rv6r-3f5q-9rgx.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-rv6r-3f5q-9rgx
- Aliases
- Published
- 2022-03-03T19:02:08Z
- Modified
- 2024-11-18T23:01:29.559171Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- 8.7 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- Twisted SSH client and server deny of service during SSH handshake.
- Details
-
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
- 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@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
Affected packages
PyPI / twisted
Package
- Name
- twisted
- View open source insights on deps.dev
- Purl
- pkg:pypi/twisted