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

submitted 5 months ago by thomask 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 4 points 5 months ago

That looks horrible.

[-] qprimed@lemmy.ml 1 points 5 months ago* (last edited 5 months ago)

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

[-] cron@feddit.org 3 points 5 months ago

openssh is typically quite robust, this is a rare exception

this post was submitted on 01 Jul 2024

38 points (100.0% liked)

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