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Debian 11 Bullseye DLA-4057-1 Critical: OpenSSH MitM Attack

debian lts
Calendar Grey February 18, 2025
Dist Debian Esm H88
Debian LTS Advisory DLA-4057-2 for OpenSSH addresses critical security flaws related to a potential interception vulnerability. Immediate upgrade recommended.
The Qualys Threat Research Unit (TRU) discovered that the OpenSSH client is vulnerable to a machine-in-the-middle attack if the VerifyHostKeyDNS option is enabled (disabled by defa...
Topics%20covered

Topics Covered

security advisory critical software update debian DoS threat attack openssh machine-in-the-middle

Summary

Details can be found in the Qualys advisory at
https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt

For Debian 11 bullseye, this problem has been fixed in version
1:8.4p1-5+deb11u4.

We recommend that you upgrade your openssh packages.

For the detailed security status of openssh please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/openssh

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
critical
Lowest
Low
Medium
High
Critical

Package: openssh
Version: 1:8.4p1-5+deb11u4
CVE ID: CVE-2025-26465

Topics%20covered

Topics Covered

security advisory critical software update debian DoS threat attack openssh machine-in-the-middle

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