Bug 1978135 (CVE-2021-34813) - CVE-2021-34813 libolm: allows a malicious Matrix homeserver to crash a client
Summary: CVE-2021-34813 libolm: allows a malicious Matrix homeserver to crash a client
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-34813
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1978136
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-01 08:05 UTC by Dhananjay Arunesh
Modified: 2021-10-28 05:30 UTC (History)
1 user (show)

Fixed In Version:
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Last Closed: 2021-10-28 05:30:14 UTC
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Description Dhananjay Arunesh 2021-07-01 08:05:02 UTC 
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://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3
https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm
https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b
Comment 1 Dhananjay Arunesh 2021-07-01 08:05:26 UTC 
Created libolm tracking bugs for this issue:

Affects: epel-8 [bug 1978136]
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