high
7
CWE
364 362
EPSS
0.046%
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2024-6409: Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9

First published: Mon Jul 01 2024(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
debian/openssh
1:8.4p1-5+deb11u3
1:9.2p1-2+deb12u3
1:9.8p1-8
F5 BIG-IP Service Proxy for Kubernetes>=1.7.0<=1.9.2
F5 BIG-IP Next Cloud-Native Network Functions>=1.1.0<=1.3.1

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-6409?

    CVE-2024-6409 is considered to be a high severity vulnerability due to its potential to allow remote attackers to exploit the race condition in OpenSSH's server.

  • How do I fix CVE-2024-6409?

    To remediate CVE-2024-6409, update OpenSSH to one of the patched versions: 1:8.4p1-5+deb11u3, 1:9.2p1-2+deb12u3, or 1:9.8p1-8.

  • Which software is affected by CVE-2024-6409?

    CVE-2024-6409 affects OpenSSH server versions, as well as specific versions of F5 BIG-IP Next SPK and F5 BIG-IP Next CNF.

  • Can CVE-2024-6409 be exploited remotely?

    Yes, CVE-2024-6409 can be exploited remotely by attackers without authentication for a limited time.

  • What type of vulnerability is CVE-2024-6409?

    CVE-2024-6409 is classified as a race condition vulnerability related to signal handling in the OpenSSH server.

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