CVE-2023-38686

CVSS 3.1 Score 9.3 of 10 (high)

Details

Published Aug 4, 2023
Updated: Aug 10, 2023
CWE ID 295

Summary

CVE-2023-38686 is a vulnerability in Sydent, an identity server for the Matrix communications protocol. Versions prior to 2.5.6 are affected by this vulnerability, which allows interception of Sydent's emails through a man-in-the-middle (MITM) attack if configured to send emails using TLS without verifying SMTP servers' certificates. Attackers with privileged network access can intercept room invitations and address confirmation emails. The vulnerability has been patched in Sydent 2.5.6, and organizations should ensure that the server certificate is trusted when applying the patch. As a workaround, one can prevent Sydent's emails from being sent by configuring the SMTP server to a loopback or non-routable address without a listening SMTP server. The vulnerability has a base severity score of 9.3 (CRITICAL) and high impact on confidentiality and integrity, according to the Common Vulnerability Scoring System (CVSS) version 3.1 rating provided by [email protected].

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