CVE-2023-38686— Matrix Sydent 信任管理问题漏洞

Sydent does not verify email server certificates

Sydent is an identity server for the Matrix communications protocol. Prior to version 2.5.6, if configured to send emails using TLS, Sydent does not verify SMTP servers' certificates. This makes Sydent's emails vulnerable to interception via a man-in-the-middle (MITM) attack. Attackers with privileged access to the network can intercept room invitations and address confirmation emails. This is patched in Sydent 2.5.6. When patching, make sure that Sydent trusts the certificate of the server it is connecting to. This should happen automatically when using properly issued certificates. Those who use self-signed certificates should make sure to copy their Certification Authority certificate, or their self signed certificate if using only one, to the trust store of your operating system. As a workaround, one can ensure Sydent's emails fail to send by setting the configured SMTP server to a loopback or non-routable address under one's control which does not have a listening SMTP server.

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

证书验证不恰当

Matrix Sydent 信任管理问题漏洞

Matrix Sydent是英国Matrix基金会的一款Matrix身份验证服务器API的实现。 Sydent 2.5.6之前版本存在信任管理问题漏洞，该漏洞源于允许拥有网络特权访问权限的攻击者拦截Sydent的电子邮件。

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