Prototype pollution in matrix-react-sdk

Impact

In certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the Object.prototype, disrupting matrix-react-sdk functionality, causing denial of service and potentially affecting program logic.

(This is part 2, where CVE-2022-36060 / GHSA-2x9c-qwgf-94xr is part 1. Part 2 covers remaining vectors not covered by part 1, found in a codebase audit scheduled after part 1.)

Patches

This is fixed in matrix-react-sdk 3.69.0

Workarounds

None.

References

• Release blog post
• The advisory GHSA-2x9c-qwgf-94xr (CVE-2022-36060) refers to an initial set of vulnerable locations discovered and patched in matrix-react-sdk 3.53.0. We opted not to disclose that advisory while we performed an audit of the codebase and are now disclosing it jointly with this one.

For more information

If you have any questions or comments about this advisory please email us at security at matrix.org.