CVE-2024-6409

Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9

Published Jul 8, 2024 CVSS 3.1 · 7 High EPSS 27.9% KEV · Not listed
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.

Remediation

Vendor Workaround

The process is identical to CVE-2024-6387, by disabling LoginGraceTime. See that CVE page for additional details.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redhat rhel Els
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4.13::el8
cpe:/a:redhat:openshift:4.13::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4.14::el8
cpe:/a:redhat:openshift:4.14::el9
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:4.15::el8
cpe:/a:redhat:openshift:4.15::el9
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 6, 2026, 8:34 PM
Reserved
Jun 28, 2024, 6:10 PM
Status
Deferred
Published
Jul 8, 2024, 6:15 PM
Modified
Nov 6, 2026, 9:17 PM
Severity
Moderate
Public date
Jul 8, 2024, 5:45 PM