CVE-2024-50336: matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal
First published: Tue Nov 12 2024(Updated: )
### 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
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| npm/matrix-js-sdk | <34.11.1 | 34.11.1 |
| Thunderbird | <128.5.2 | 128.5.2 |
| Thunderbird | <134 | 134 |
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Reference Links
- https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-xvg8-m4x3-w6xr
- https://nvd.nist.gov/vuln/detail/CVE-2024-50336
- https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5
- https://github.com/advisories/GHSA-xvg8-m4x3-w6xr (Advisory)
- https://bugzilla.mozilla.org/show_bug.cgi?id=1929264
- https://www.mozilla.org/en-US/security/advisories/mfsa2024-69/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-04/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2024-50336?
CVE-2024-50336 has been classified as a moderate severity vulnerability due to the potential for client-side path traversal.
How do I fix CVE-2024-50336?
To fix CVE-2024-50336, upgrade the matrix-js-sdk to version 34.11.1 or later.
Who is affected by CVE-2024-50336?
Clients using matrix-js-sdk versions prior to 34.11.0 are affected by CVE-2024-50336.
What kind of impact does CVE-2024-50336 have?
CVE-2024-50336 allows a malicious room member to issue arbitrary authenticated GET requests to the client's homeserver.
Which software packages are affected by CVE-2024-50336?
CVE-2024-50336 affects matrix-js-sdk, Mozilla Thunderbird, and specific versions of these packages.
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