Detections
Analytics
CVE-2021-34813
critical
Description
Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.
References
https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm
https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3
https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b