CVE-2022-21716
Published: August 31, 2023Last modified: August 31, 2023
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | py3-twisted | Not affected (22.10.0-r1) |
| Stream | py3-twisted | Not affected (22.10.0-r3) |
References
- https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9
- https://github.com/twisted/twisted/releases/tag/twisted-22.2.0
- https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
- https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
- https://security.gentoo.org/glsa/202301-02
- https://twistedmatrix.com/trac/ticket/10284
- https://www.oracle.com/security-alerts/cpuapr2022.html