Vulnerability identifier: #VU59080

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-44538

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
olm
Universal components / Libraries / Libraries used by multiple products

Vendor: Matrix.org

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a boundary error within the olm_session_describe() function in libolm. A remote attacker send specially crafted messages to the application that is using the affected library, trigger buffer overflow and perform a denial of service (DoS) attack

Mitigation
Install updates from vendor's website.

Vulnerable software versions

olm: 3.0.0 - 3.2.7

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CPE

• cpe:2.3:a:matrix_org:libolm:3.2.6:*:*:*:*:*:*:*

External links
http://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk
http://gitlab.matrix.org/matrix-org/olm/-/tags

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?