CVE-2021-34813 — Out-of-bounds Write in OLM

CWE-787 — Out-of-bounds Write7 documents7 sources
Severity
9.8CRITICALNVD
EPSS
4.5%
top 10.91%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Matrix OLM
Timeline
PublishedJun 16
Latest updateDec 7

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶NVDmatrix/olm< 3.2.3
▶Debianmatrix/olm< 3.2.3~dfsg-3+2

Patches

Patch: gitlab.matrix.org ↗Patch: matrix.org ↗Patch: gitlab.matrix.org ↗

🔴Vulnerability Details

3
GHSA
GHSA-269w-9hm6-g22q: Matrix libolm before 3↗2022-05-24
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OSV
CVE-2021-34813: Matrix libolm before 3↗2021-06-16
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CVEList
CVE-2021-34813: Matrix libolm before 3↗2021-06-16
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📋Vendor Advisories

2
Ubuntu
Olm vulnerability↗2021-12-15
▶
Debian
CVE-2021-34813: olm - Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a clien...↗2021
▶

📄Research Papers

1
arXiv
The Matrix Reloaded: A Mechanized Formal Analysis of the Matrix Cryptographic Suite↗2024-12-07
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CVE-2021-34813 — Out-of-bounds Write in Matrix OLM | cvebase