CVE-2023-38691— matrix-appservice-bridge doesn't verify the sub parameter of an openId token exhange, allowing unauthorized access to provisioning APIs

matrix-appservice-bridge doesn't verify the sub parameter of an openId token exhange, allowing unauthorized access to provisioning APIs

matrix-appservice-bridge provides an API for setting up bridges. Starting in version 4.0.0 and prior to versions 8.1.2 and 9.0.1, a malicious Matrix server can use a foreign user's MXID in an OpenID exchange, allowing a bad actor to impersonate users when using the provisioning API. The library does not check that the servername part of the `sub` parameter (containing the user's *claimed* MXID) is the the same as the servername we are talking to. A malicious actor could spin up a server on any given domain, respond with a `sub` parameter according to the user they want to act as and use the resulting token to perform provisioning requests. Versions 8.1.2 and 9.0.1 contain a patch. As a workaround, disable the provisioning API.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

认证机制不恰当

Matrix-appservice-bridge 授权问题漏洞

Matrix-appservice-bridge是开源的一个服务。用于Matrix通信程序的应用服务的桥接。 Matrix-appservice-bridge存在授权问题漏洞，该漏洞源于恶意Matrix服务器可以在OpenID交换中使用外部用户的MXID，从而允许攻击者在使用配置API时冒充用户。受影响的产品和版本：Matrix-appservice-bridge 4.0.0及更高版本，8.1.2之前版本，9.0.1之前版本。

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