util-linux: Local privilege escalation — GLSA 200710-18

The mount and umount programs might allow local attackers to gain root privileges.

Affected Packages

sys-apps/util-linux on all architectures
Affected versions < 2.12r-r8
Unaffected versions >= 2.12r-r8

Background

util-linux is a suite of Linux programs including mount and umount, programs used to mount and unmount filesystems.

Description

Ludwig Nussel discovered that the check_special_mountprog() and check_special_umountprog() functions call setuid() and setgid() in the wrong order and do not check the return values, which can lead to privileges being dropped improperly.

Impact

A local attacker may be able to exploit this vulnerability by using mount helpers such as the mount.nfs program to gain root privileges and run arbitrary commands.

Workaround

There is no known workaround at this time.

Resolution

All util-linux users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-apps/util-linux-2.12r-r8"

References

Release Date
October 18, 2007

Latest Revision
October 18, 2007: 01

Severity
high

Exploitable
local

Bugzilla entries