Published: 16/06/2021 Updated: 23/06/2021

CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10

CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9

VMScore: 668

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Matrix libolm prior to 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.

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Debian Bug report logs - #989997 olm: CVE-2021-34813 Package: src:olm; Maintainer for src:olm is Matrix Packaging Team <pkg-matrix-maintainers@listsaliothdebianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Thu, 17 Jun 2021 13:48:01 UTC Severity: important Tags: security, upstream Found in vers ...

Matrix libolm before 323 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 ...

CWE-787 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 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989997 https://nvd.nist.gov

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CVE-2021-34813

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