| Name | CVE-2021-40823 |
| Description | A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 866502, 994213 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| node-matrix-js-sdk (PTS) | buster | 0.9.2-1 | vulnerable |
| bullseye | 9.3.0+~cs9.9.16-2 | vulnerable |
| sid | 9.11.0+~cs9.9.16-2 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[bullseye] - node-matrix-js-sdk <no-dsa> (Minor issue)
[buster] - node-matrix-js-sdk <no-dsa> (Minor issue)
https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing/
https://github.com/matrix-org/matrix-js-sdk/commit/894c24880da0e1cc81818f51c0db80e3c9fb2be9 (v12.4.1)