CVE-2023-38686

描述

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.

如何修補 CVE-2023-38686

要修補 CVE-2023-38686,請將受影響套件升級到下列已修補版本。

• —升級至 2.5.6 或更新版本
• —升級至 1cd748307c6b168b66154e6c4db715d4b9551261 或更新版本

CVE-2023-38686 正在被利用嗎?

低 — EPSS 為 0.2%,目前沒有觀察到大規模利用活動。

受影響套件(2)

• from 0, < 2.5.6
• from 0, < 1cd748307c6b168b66154e6c4db715d4b9551261 | from 0, < 2.5.6

CVSS 分數

參考連結(11)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2023-38686
• PATCHgithub.com/matrix-org/sydent
• WEBdocs.python.org/3/library/ssl.html?highlight=ssl#security-considerations
• WEBgithub.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261