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CVE
PUBLISHED

CVE-2024-6409

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

Assignerredhat
Reserved2024-06-28
Published2024-07-08
Updated2024-07-13

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.



HIGH: 7.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

Problem types

Signal Handler Race Condition

Product status

Default status
unaffected

Default status
affected

0:8.7p1-38.el9_4.4 before *
unaffected

Default status
affected

0:8.7p1-38.el9_4.4 before *
unaffected

Default status
unaffected

Default status
unaffected

Default status
unaffected

Default status
affected

Timeline

2024-07-01:Reported to Red Hat.
2024-07-08:Made public.

References

http://www.openwall.com/lists/oss-security/2024/07/08/2

http://www.openwall.com/lists/oss-security/2024/07/09/2

http://www.openwall.com/lists/oss-security/2024/07/09/5

http://www.openwall.com/lists/oss-security/2024/07/10/1

http://www.openwall.com/lists/oss-security/2024/07/10/2

https://access.redhat.com/errata/RHSA-2024:4457 (RHSA-2024:4457) vendor-advisory

https://access.redhat.com/security/cve/CVE-2024-6409 vdb-entry

https://almalinux.org/blog/2024-07-09-cve-2024-6409/

https://bugzilla.redhat.com/show_bug.cgi?id=2295085 (RHBZ#2295085) issue-tracking

https://bugzilla.suse.com/show_bug.cgi?id=1227217

https://explore.alas.aws.amazon.com/CVE-2024-6409.html

https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0

https://security-tracker.debian.org/tracker/CVE-2024-6409

https://security.netapp.com/advisory/ntap-20240712-0003/

https://sig-security.rocky.page/issues/CVE-2024-6409/

https://ubuntu.com/security/CVE-2024-6409

https://www.suse.com/security/cve/CVE-2024-6409.html

cve.org CVE-2024-6409

nvd.nist.gov CVE-2024-6409

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