Red Hat: CVE-2024-6409: openssh: Possible remote code execution due to a race condition in signal handling affecting Red Hat Enterprise Linux 9 (Multiple Advisories)

Red Hat: CVE-2024-6409: openssh: Possible remote code execution due to a race condition in signal handling affecting Red Hat Enterprise Linux 9 (Multiple Advisories)

Severity

7

CVSS

(AV:N/AC:H/Au:N/C:P/I:P/A:C)

Published

07/08/2024

Created

07/16/2024

Added

07/16/2024

Modified

09/03/2024

Description

A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.

Solution(s)

• redhat-upgrade-openssh
• redhat-upgrade-openssh-askpass
• redhat-upgrade-openssh-askpass-debuginfo
• redhat-upgrade-openssh-clients
• redhat-upgrade-openssh-clients-debuginfo
• redhat-upgrade-openssh-debuginfo
• redhat-upgrade-openssh-debugsource
• redhat-upgrade-openssh-keycat
• redhat-upgrade-openssh-keycat-debuginfo
• redhat-upgrade-openssh-server
• redhat-upgrade-openssh-server-debuginfo
• redhat-upgrade-openssh-sk-dummy-debuginfo
• redhat-upgrade-pam_ssh_agent_auth
• redhat-upgrade-pam_ssh_agent_auth-debuginfo

References

• CVE-2024-6409
• RHSA-2024:4457
• RHSA-2024:4716