CVE-2024-42369
matrix-js-sdk will freeze when a user sets a room with itself as a its predecessor
Impact
### Impact A malicious homeserver can craft a room or room structure such that the predecessors form a cycle. The matrix-js-sdk's `getRoomUpgradeHistory` function will infinitely recurse in this case, causing the code to hang. This method is public but also called by the 'leaveRoomChain()' method, so leaving a room will also trigger the bug. Even if the CVSS score would be 4.1 ([AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L&version=3.1)) we classify this as High severity issue. ### Patches This was patched in matrix-js-sdk 34.3.1. ### Workarounds Sanity check rooms before passing them to the matrix-js-sdk or avoid calling either `getRoomUpgradeHistory` or `leaveRoomChain`. ### References N/A.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | matrix-js-sdk | < 34.3.1 | 34.3.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Matrix | Javascript Sdk | before 34.3.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/matrix-org/matrix-js-sdk/commit/a0efed8b881b3db6c9f2c71d6a6e74c2828978c6
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-vhr5-g3pm-49fm
- https://github.com/advisories/GHSA-vhr5-g3pm-49fm
- https://nvd.nist.gov/vuln/detail/CVE-2024-42369