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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.

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Matrix libolm 缓冲区错误漏洞

Matrix libolm是一个加密库。 Matrix libolm 3.2.7 之前的 olm_session_describe 函数存在安全漏洞，攻击者可以构建一个精心设计的消息序列来操纵接收方会话的状态，对于某些缓冲区大小，在调用 olm_session_describe 时会发生缓冲区溢出。

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