MGASA-2021-0571

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MGASA-2021-0571

Summary: Updated olm packages fix security vulnerability

Details: 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. Attackers can 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://advisories.mageia.org/MGASA-2021-0571.html, 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