CVE-2024-6409
Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9
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Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9
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.
Reserved 2024-06-28 | Published 2024-07-08 | Updated 2025-05-22 | Assigner redhat| 2024-07-01: | Reported to Red Hat. |
| 2024-07-08: | Made public. |
Red Hat would like to thank Solar Designer (CIQ/Rocky Linux) for reporting this issue.
access.redhat.com/errata/RHSA-2024:4457 (RHSA-2024:4457)
access.redhat.com/errata/RHSA-2024:4613 (RHSA-2024:4613)
access.redhat.com/errata/RHSA-2024:4716 (RHSA-2024:4716)
access.redhat.com/errata/RHSA-2024:4910 (RHSA-2024:4910)
access.redhat.com/errata/RHSA-2024:4955 (RHSA-2024:4955)
access.redhat.com/errata/RHSA-2024:4960 (RHSA-2024:4960)
access.redhat.com/errata/RHSA-2024:5444 (RHSA-2024:5444)
access.redhat.com/security/cve/CVE-2024-6409
bugzilla.redhat.com/show_bug.cgi?id=2295085 (RHBZ#2295085)
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