Security Vulnerability: remote code execution in openssh aka CVE-2024-6387 aka "regreSSHion"
This document (000021482) is provided subject to the disclaimer at the end of this document.
Environment
For a comprehensive overview of affected products please review the SUSE CVE announcement .
Situation
Security Researchers from Qualys have identified a openssh remote code execution in openssh versions before 4.4 and starting from 8.5 to 9.7. The problem is a race condition in handling signals and syscall logging,which is however very hard to trigger and unlikely exploitable within reasonable times.
Only SUSE Linux Enterprise 15 SP6, SUSE Linux Micro 6.0, openSUSE Leap 15.6 and openSUSE Tumbleweed were affected by this problem.
Only SUSE Linux Enterprise 15 SP6, SUSE Linux Micro 6.0, openSUSE Leap 15.6 and openSUSE Tumbleweed were affected by this problem.
Resolution
Please install the security updates as soon they become available.
Status
Security Alert
Additional Information
Workaround
In the "/etc/sysconfig/ssh" filed in the SSHD_OPTS line add the "-e" option, like:
The -e option will not use the affected syslog() function to the journal, but instead log to stderr to systemd and so in turn to journald.
References: https://www.suse.com/security/cve/CVE-2024-6387.html
Researcher Blog: https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server
In the "/etc/sysconfig/ssh" filed in the SSHD_OPTS line add the "-e" option, like:
SSHD_OPTS="-e"And restart the sshd.service.
The -e option will not use the affected syslog() function to the journal, but instead log to stderr to systemd and so in turn to journald.
References: https://www.suse.com/security/cve/CVE-2024-6387.html
Researcher Blog: https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server
Disclaimer
This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.
- Document ID:000021482
- Creation Date: 02-Jul-2024
- Modified Date:02-Jul-2024
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- SUSE Linux Enterprise Desktop
- SUSE Linux Enterprise Server
- SUSE Linux Enterprise Server for SAP Applications
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