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critical9.8

CVE-2021-44538

The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow.

Impact

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. The known affected products are Element Web And SchildiChat Web.

Affected products

VendorProductAffected versions
MatrixElement
before 1.9.7
MatrixJavascript Sdk
from 2.4.2 before 15.2.1
MatrixOlm
from 3.1.4 before 3.2.8
SchildiSchildichat
before 1.9.7-sc1
Cinny ProjectCinny
before 1.6.0
DebianDebian Linux
Versions 9.0, 10.0, 11.0

Weakness classification

CWE-119

References