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Mageia 8 MGASA-2021-0571 Critical: OLM Buffer Overflow Mitigation

mageia
Calendar Grey December 19, 2021
Dist Mageia Esm H88
The notification outlines a critical patch for olm components targeting a memory overflow security issue within Matrix libolm.
Updated olm packages fix security vulnerability: The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow

Summary

Updated olm packages fix security vulnerability:
The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackerscan construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits (CVE-2021-44538).

References

- https://bugs.mageia.org/show_bug.cgi?id=29773

- https://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk

- https://www.cve.org/CVERecord?id=CVE-2021-44538

Topics%20covered

Topics Covered

security advisory buffer overflow critical attack prevention Mageia olm packages Matrix libolm

Resolution

SRPMS

- 8/core/olm-3.2.1-1.1.mga8

Severity
critical
Lowest
Low
Medium
High
Critical

Publication date: 19 Dec 2021
URL: https://advisories.mageia.org/MGASA-2021-0571.html
Type: security
CVE: CVE-2021-44538

Topics%20covered

Topics Covered

security advisory buffer overflow critical attack prevention Mageia olm packages Matrix libolm

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