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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[-] infeeeee@lemm.ee 2 points 5 months ago

It says 4.4 to 8.4 versions are not vulnerable. A lot of old distro releases are on these versions, Debian 10, 11, Ubuntu 20.04 LTS is not affected https://pkgs.org/download/openssh-server

this post was submitted on 01 Jul 2024

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