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regreSSHion: RCE in OpenSSH's server, on glibc-based Linux systems (CVE-2024-6387) (www.qualys.com)

submitted 4 months ago by [email protected] to c/[email protected]

5 comments fedilink hide all child comments

The following summary from Debian's security list:

The Qualys Threat Research Unit (TRU) discovered that OpenSSH, an implementation of the SSH protocol suite, is prone to a signal handler race condition. If a client does not authenticate within LoginGraceTime seconds (120 by default), then sshd's SIGALRM handler is called asynchronously and calls various functions that are not async-signal-safe. A remote unauthenticated attacker can take advantage of this flaw to execute arbitrary code with root privileges. This flaw affects sshd in its default configuration.

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[–] [email protected] 1 points 4 months ago* (last edited 4 months ago) (1 children)

indeed, but your SSH ports should not be hanging out in the wind for any old IP to hit.

[–] [email protected] 3 points 4 months ago

openssh is typically quite robust, this is a rare exception