Vulnerability Details CVE-2021-34813
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.045
EPSS Ranking 88.6%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5
References
- https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b
- 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://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3
- https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm
Products affected by CVE-2021-34813
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cpe:2.3:a:matrix:olm:0.1.0
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cpe:2.3:a:matrix:olm:1.0.0
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cpe:2.3:a:matrix:olm:1.1.0
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cpe:2.3:a:matrix:olm:1.2.0
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cpe:2.3:a:matrix:olm:1.3.0
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cpe:2.3:a:matrix:olm:2.0.0
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cpe:2.3:a:matrix:olm:2.1.0
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cpe:2.3:a:matrix:olm:2.2.0
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cpe:2.3:a:matrix:olm:2.2.1
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cpe:2.3:a:matrix:olm:2.2.2
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cpe:2.3:a:matrix:olm:2.3.0
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cpe:2.3:a:matrix:olm:3.0.0
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cpe:2.3:a:matrix:olm:3.1.0
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cpe:2.3:a:matrix:olm:3.1.1
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cpe:2.3:a:matrix:olm:3.1.2
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cpe:2.3:a:matrix:olm:3.1.3
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cpe:2.3:a:matrix:olm:3.1.4
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cpe:2.3:a:matrix:olm:3.1.5
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cpe:2.3:a:matrix:olm:3.2.0
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cpe:2.3:a:matrix:olm:3.2.1
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cpe:2.3:a:matrix:olm:3.2.2