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Fedora 40: FEDORA-2025-62f6cb2785 Moderate: OpenSSH Memory Exhaustion Fix

fedora
Calendar Grey February 24, 2025
Dist Fedora Esm H88
Essential patches for OpenSSH in Fedora 40 address memory overload and MITM vulnerabilities. Ensure to implement suggested security measures.
Fix missing error codes set and invalid error code checks in OpenSSH

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 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).

Topics%20covered

Topics Covered

security advisory Fedora security fix vulnerability memory exhaustion OpenSSH MITM attack error codes

Change Log

* Tue Feb 18 2025 Dmitry Belyavskiy - 9.6p1-2 - 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-2025-62f6cb2785 2025-02-24 01:25:12.732945+00:00 Name : openssh Product : Fedora 40 Version : 9.6p1 Release : 2.fc40 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-2025-62f6cb2785' 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

Name: openssh
Product: Fedora 40
Version: 9.6p1
Release: 2.fc40
URL: https://www.openssh.org/portable.html
Summary: An open source implementation of SSH protocol version 2

Topics%20covered

Topics Covered

security advisory Fedora security fix vulnerability memory exhaustion OpenSSH MITM attack error codes

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