CVE-2022-39203
Parsing issue in matrix-org/node-irc leading to room takeovers
Impact
### Impact Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. ### Patched The vulnerability has been patched in matrix-appservice-irc 0.35.0. ### Workarounds Disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config. ### 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 [security@matrix.org](mailto:security@matrix.org).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | matrix-appservice-irc | < 0.35.0 | 0.35.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Matrix | Matrix Irc Bridge | before 0.35.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-xvqg-mv25-rwvw
- https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity/
- https://github.com/advisories/GHSA-xvqg-mv25-rwvw
- https://nvd.nist.gov/vuln/detail/CVE-2022-39203