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

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
07/08/2024
Created
07/26/2024
Added
07/25/2024
Modified
08/23/2024

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)

  • linuxrpm-upgrade-rhcos

References

  • https://attackerkb.com/topics/cve-2024-6409
  • CVE - 2024-6409
  • RHSA-2024:4457
  • RHSA-2024:4613
  • RHSA-2024:4716
  • RHSA-2024:4910
  • RHSA-2024:4955
  • RHSA-2024:4960
  • RHSA-2024:5444
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