GHSA-xvg8-m4x3-w6xr
matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal
Quick fix
GHSA-xvg8-m4x3-w6xr — matrix-js-sdk: upgrade to the fixed version with the command below.
npm install matrix-js-sdk@34.11.1Details
### Summary
matrix-js-sdk before 34.11.0 is vulnerable to client-side path traversal via crafted MXC URIs. A malicious room member can trigger clients based on the matrix-js-sdk to issue arbitrary authenticated GET requests to the client's homeserver.
### Details
The Matrix specification demands homeservers to [perform validation](https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5) of the `server-name` and `media-id` components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a similar check must also be performed on the client to prevent *client-side* path traversal. matrix-js-sdk fails to perform this validation.
### Patches
Fixed in matrix-js-sdk 34.11.1.
### Workarounds
None.
### References
- https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5 - https://blog.doyensec.com/2024/07/02/cspt2csrf.html
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-xvg8-m4x3-w6xr[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2024-50336[ADVISORY]
- https://github.com/matrix-org/matrix-js-sdk[PACKAGE]
- https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html[WEB]
- https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5[WEB]