CVE Vulnerability

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.

7.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.8 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Release Notes Vendor Advisory
https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm Exploit Patch
https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Patch Vendor Advisory
Configurations

Configuration 1

cpe:2.3:a:matrix:olm:*:*:*:*:*:*:*:*
Information

Published : 2021-06-16 06:15

Updated : 2021-06-23 02:29

NVD link : CVE-2021-34813

Mitre link : CVE-2021-34813

Products Affected
No products.
CWE
CWE-787