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

submitted 2 months ago by thomask@lemmy.sdf.org to c/cybersecurity@sh.itjust.works

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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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[–] cron@feddit.org 3 points 2 months ago

openssh is typically quite robust, this is a rare exception