Vulnerability Monitor

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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.

Published

2021-06-16T18:15:09.730

Last Modified

2024-11-21T06:11:15.373

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	matrix	olm	< 3.2.3	Yes

References

https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Patch, Vendor Advisory ([email protected])
https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Release Notes, Vendor Advisory ([email protected])
https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm Exploit, Patch, Vendor Advisory ([email protected])
https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm Exploit, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)