CVE-2023-38700: matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms
First published: Fri Aug 04 2023(Updated: )
### Impact It was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. ### Patches Please upgrade to 1.0.1. ### Workarounds You can set the `matrixHandler.eventCacheSize` config value to `0` to workaround this bug. However, this may impact performance. ### 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).
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Matrix Matrix Irc Bridge | <1.0.1 | |
| npm/matrix-appservice-irc | <=1.0.0 | 1.0.1 |
Remedy
https://github.com/matrix-org/matrix-appservice-irc/commit/8bbd2b69a16cbcbeffdd9b5c973fd89d61498d75
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Reference Links
- https://github.com/matrix-org/matrix-appservice-irc/releases/tag/1.0.1
- https://github.com/matrix-org/matrix-appservice-irc/commit/8bbd2b69a16cbcbeffdd9b5c973fd89d61498d75
- https://github.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-c7hh-3v6c-fj4q
- https://nvd.nist.gov/vuln/detail/CVE-2023-38700
- https://github.com/advisories/GHSA-c7hh-3v6c-fj4q (Advisory)
Frequently Asked Questions
What is CVE-2023-38700?
CVE-2023-38700 is a vulnerability in the matrix-appservice-irc Node.js IRC bridge for Matrix.
What is the impact of CVE-2023-38700?
The impact of CVE-2023-38700 is that it allows an attacker to leak part of a targeted message event from another bridged room.
How can I fix CVE-2023-38700?
To fix CVE-2023-38700, please upgrade to version 1.0.1 of matrix-appservice-irc.
Are there any workarounds for CVE-2023-38700?
Yes, you can set the `matrixHandler.eventCacheSize` config value to `0` as a workaround for CVE-2023-38700.
What is the severity of CVE-2023-38700?
CVE-2023-38700 has a severity level of low.
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