CVE-2016-2856

Name	CVE-2016-2856
Description	pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk. NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
glibc (PTS)	bullseye	2.31-13+deb11u11	fixed
	bullseye (security)	2.31-13+deb11u10	fixed
	bookworm	2.36-9+deb12u9	fixed
	bookworm (security)	2.36-9+deb12u7	fixed
	trixie	2.40-3	fixed
	sid	2.40-4	fixed

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

Package	Type	Release	Fixed Version	Urgency
eglibc	source	(unstable)	(unfixed)
glibc	source	jessie	2.19-18+deb8u4
glibc	source	(unstable)	2.21-1	low

Notes

[squeeze] - eglibc <no-dsa> (Minor issue)
[wheezy] - eglibc <no-dsa> (Minor issue)
http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403
http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958
https://www.openwall.com/lists/oss-security/2016/03/07/2