GLSA 202407-09: OpenSSH: Remote Code Execution

http://security.gentoo.org/

Severity:	high
Title:	OpenSSH: Remote Code Execution
Date:	07/01/2024
Bugs:	#935271
ID:	202407-09

Synopsis

A vulnerability has been discovered in OpenSSH, which can lead to remote code execution with root privileges.

Background

OpenSSH is a free application suite consisting of server and clients that replace tools like telnet, rlogin, rcp and ftp with more secure versions offering additional functionality.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/openssh	< 9.7_p1-r6	>= 9.7_p1-r6	All supported architectures

Description

A vulnerability has been discovered in OpenSSH. Please review the CVE identifier referenced below for details.

Impact

A critical vulnerability in sshd(8) was present in Portable OpenSSH versions that may allow arbitrary code execution with root privileges. Successful exploitation has been demonstrated on 32-bit Linux/glibc systems with ASLR. Under lab conditions, the attack requires on average 6-8 hours of continuous connections up to the maximum the server will accept. Exploitation on 64-bit systems is believed to be possible but has not been demonstrated at this time. It's likely that these attacks will be improved upon.

Workaround

There is no known workaround at this time. Note that Gentoo has backported the fix to the following versions: net-misc/openssh-9.6_p1-r5 net-misc/openssh-9.7_p1-r6

Resolution

All OpenSSH users should upgrade to the latest version and restart the sshd server (to ensure access for new sessions and no vulnerable code keeps running).

          # emerge --sync
          # emerge --ask --oneshot --verbose ">=net-misc/openssh-9.7_p1-r6"

With OpenRC:


          # rc-service sshd restart

With systemd:


          #  systemctl try-restart sshd.service

References

CVE-2024-6387

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202407-09.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.