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Fedora 42: openssh 2025-1e92156b24 Security Advisory Updates

fedora
Calendar Grey March 21, 2025
Dist Fedora Esm H88
Update for openssh in Fedora 42 addresses important regressions to prevent MITM and memory exhaustion attacks.
Automatic update for openssh-9.9p1-9.fc42

Summary

SSH (Secure SHell) is a program for logging into and executing

commands on a remote machine. SSH is intended to replace rlogin and

rsh, and to provide secure encrypted communications between two

untrusted hosts over an insecure network. X11 connections and

arbitrary TCP/IP ports can also be forwarded over the secure channel.

OpenSSH is OpenBSD's version of the last free version of SSH, bringing

it up to date in terms of security and features.

This package includes the core files necessary for both the OpenSSH

client and server. To make this package useful, you should also

install openssh-clients, openssh-server, or both.

Update Information:

Automatic update for openssh-9.9p1-9.fc42. Changelog * Tue Feb 18 2025 Dmitry Belyavskiy - 9.9p1-9 - Fix regression of Match directive processing - Fix missing error codes set and invalid error code checks in OpenSSH. It prevents memory exhaustion attack and a MITM attack when VerifyHostKeyDNS is on (CVE-2025-26465, CVE-2025-26466). * Sat Feb 1 2025 Björn Esser - 9.9p1-8.1 - Add explicit BR: libxcrypt-devel * Wed Jan 29 2025 FeRD (Frank Dana) - 9.9p1-8 - Replace deprecated (since 8.7) ChallengeResponseAuthentication with KbdInteractiveAuthentication, in redhat sshd config

Topics%20covered

Topics Covered

security advisory Fedora update information openssh memory exhaustion MITM attack

Change Log

* Tue Feb 18 2025 Dmitry Belyavskiy - 9.9p1-9 - Fix regression of Match directive processing - Fix missing error codes set and invalid error code checks in OpenSSH. It prevents memory exhaustion attack and a MITM attack when VerifyHostKeyDNS is on (CVE-2025-26465, CVE-2025-26466). * Sat Feb 1 2025 Björn Esser - 9.9p1-8.1 - Add explicit BR: libxcrypt-devel * Wed Jan 29 2025 FeRD (Frank Dana) - 9.9p1-8 - Replace deprecated (since 8.7) ChallengeResponseAuthentication with KbdInteractiveAuthentication, in redhat sshd config

References

Fedora Update Notification FEDORA-2025-1e92156b24 2025-03-21 00:15:51.822879+00:00
Name : openssh Product : Fedora 42 Version : 9.9p1 Release : 9.fc42 URL : https://www.openssh.org/portable.html Summary : An open source implementation of SSH protocol version 2 Description : SSH (Secure SHell) is a program for logging into and executing commands on a remote machine. SSH is intended to replace rlogin and rsh, and to provide secure encrypted communications between two untrusted hosts over an insecure network. X11 connections and arbitrary TCP/IP ports can also be forwarded over the secure channel.
OpenSSH is OpenBSD's version of the last free version of SSH, bringing it up to date in terms of security and features.
This package includes the core files necessary for both the OpenSSH client and server. To make this package useful, you should also install openssh-clients, openssh-server, or both.

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2025-1e92156b24' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
important
Lowest
Low
Medium
High
Critical

Name: openssh
Product: Fedora 42
Version: 9.9p1
Release: 9.fc42
URL: https://www.openssh.org/portable.html
Summary: An open source implementation of SSH protocol version 2

Topics%20covered

Topics Covered

security advisory Fedora update information openssh memory exhaustion MITM attack

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