CVE-2022-39202

Description

### Impact IRC allows you to specify multiple modes in a single mode command. Due to a bug in the underlying matrix-org/node-irc library, affected versions of matrix-appservice-irc perform parsing of such modes incorrectly, potentially resulting in the wrong user being given permissions. Mode commands can only be executed by privileged users, so this can only be abused if an operator is tricked into running the command on behalf of an attacker. ### Patches The vulnerability has been patched in matrix-appservice-irc 0.35.0. ### Workarounds Refrain from entering mode commands suggested by untrusted users. Avoid using multiple modes in a single command. ### References - https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity ### Credits Discovered and reported by [Val Lorentz](https://valentin-lorentz.fr/). ### For more information If you have any questions or comments about this advisory email us at [[email protected]](mailto:[email protected]).

How to fix CVE-2022-39202

To remediate CVE-2022-39202, upgrade the affected package to a fixed version below.

• —upgrade to 0.35.0 or later

Is CVE-2022-39202 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 0.35.0

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2022-39202
• PATCHgithub.com/matrix-org/matrix-appservice-irc
• WEBgithub.com/matrix-org/matrix-appservice-irc/commit/5f87dbed87b4b6dc49b7965ff152ee8535719e67
• WEBgithub.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-cq7q-5c67-w39w