CVE-2016-2779

Name	CVE-2016-2779
Description	runuser in util-linux allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	815922

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
util-linux (PTS)	bullseye (security), bullseye	2.36.1-8+deb11u2	fixed
	bookworm	2.38.1-5+deb12u2	fixed
	bookworm (security)	2.38.1-5+deb12u1	fixed
	trixie	2.40.2-12	fixed
	sid	2.40.2-13	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Debian Bugs
util-linux	source	squeeze	(not affected)
util-linux	source	wheezy	(not affected)
util-linux	source	(unstable)	2.31.1-0.1	815922

Notes

[stretch] - util-linux <no-dsa> (Minor issue)
[jessie] - util-linux <no-dsa> (Minor issue)
[wheezy] - util-linux <not-affected> (runuser[.c] not yet present)
[squeeze] - util-linux <not-affected> (runuser[.c] not yet present)
Restricting ioctl on the kernel side seems the better approach, patches have been posted to kernel-hardening list
https://www.openwall.com/lists/oss-security/2016/02/27/1
https://marc.info/?l=util-linux-ng&m=145694736107128&w=2
2.31 introduces a new --pty option to separate privileged and unprivileged
shells (not enabled by default and the cli switch is necessary).