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CVE-2021-34813

Published: 16 June 2021

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.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
olm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal
Released (3.1.3+dfsg-2ubuntu0.1~esm1)
Available with Ubuntu Pro
groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Not vulnerable
(3.2.3)
kinetic Not vulnerable
(3.2.3)
lunar Not vulnerable
(3.2.3)
mantic Not vulnerable
(3.2.3)
noble Not vulnerable
(3.2.3)
trusty Does not exist

upstream
Released (3.2.3)
xenial Does not exist

Patches:
upstream: https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b
upstream: https://gitlab.matrix.org/matrix-org/olm/-/commit/e82f2601b0dc2a69d3167499ee969555267b7aa6

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H