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Fedora 41: FEDORA-2025-18cb3f852d critical: OpenSSH Match Directive Issue

fedora
Calendar Grey February 20, 2025
Dist Fedora Esm H88
Recent updates on the OpenSSH security advisory for Fedora 41 address match directive vulnerabilities, enhancing security and mitigating risks from misconfigurations
Fix regression of Match directive processing

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:

Fix regression of Match directive processing

Topics%20covered

Topics Covered

security advisory software update Fedora critical severity attack prevention OpenSSH attack mitigation match processing match directive

Change Log

* Tue Feb 18 2025 Dmitry Belyavskiy - 9.9p1-3 - 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).

References

Fedora Update Notification FEDORA-2025-18cb3f852d 2025-02-20 02:26:22.548385+00:00 Name : openssh Product : Fedora 41 Version : 9.9p1 Release : 3.fc41 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-2025-18cb3f852d' 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
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Name: openssh
Product: Fedora 41
Version: 9.9p1
Release: 3.fc41
URL: https://www.openssh.org/portable.html
Summary: An open source implementation of SSH protocol version 2

Topics%20covered

Topics Covered

security advisory software update Fedora critical severity attack prevention OpenSSH attack mitigation match processing match directive

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