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CVE-2013-2207

Published: 09 October 2013

pt_chown in GNU C Library (aka glibc or libc6) before 2.18 does not properly check permissions for tty files, which allows local users to change the permission on the files and obtain access to arbitrary pseudo-terminals by leveraging a FUSE file system.

From the Ubuntu security team

Martin Carpenter discovered that pt_chown in the GNU C Library did not properly check permissions for tty files. A local attacker could use this to gain administrative privileges or expose sensitive information.

Priority

Low

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr)
Released (2.19-0ubuntu6.8)
Patches:
Upstream: http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e4608715e6e1dd2adc91982fd151d5ba4f761d69
glibc
Launchpad, Ubuntu, Debian
Upstream Needed

Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(2.23-0ubuntu1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Notes

AuthorNote
mdeslaur
patch disables building of pt_chown
We can't just remove pt_chown from older releases, as
unfortunately a lot of stuff still needs it, like lxc for
example. We'll need to identify them first and fix them at the
same time.

While this CVE was originally marked as fixed in 2.17-93ubuntu2,
it got reverted in 2.17-93ubuntu4.

References

Bugs