CVE - CVE-2023-38686

CVE-ID
CVE-2023-38686	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://docs.python.org/3/library/ssl.html?highlight=ssl#security-considerations URL:https://docs.python.org/3/library/ssl.html?highlight=ssl#security-considerations MISC:https://github.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261 URL:https://github.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261 MISC:https://github.com/matrix-org/sydent/pull/574 URL:https://github.com/matrix-org/sydent/pull/574 MISC:https://github.com/matrix-org/sydent/releases/tag/v2.5.6 URL:https://github.com/matrix-org/sydent/releases/tag/v2.5.6 MISC:https://github.com/matrix-org/sydent/security/advisories/GHSA-p6hw-wm59-3g5g URL:https://github.com/matrix-org/sydent/security/advisories/GHSA-p6hw-wm59-3g5g MISC:https://github.com/python/cpython/issues/91826 URL:https://github.com/python/cpython/issues/91826 MISC:https://peps.python.org/pep-0476/ URL:https://peps.python.org/pep-0476/
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20230724	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20230724)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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