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util-linux: Local privilege escalation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200710-18 / util-linux
Release Date October 18, 2007
Latest Revision October 18, 2007: 01
Impact high
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-apps/util-linux < 2.12r-r8 >= 2.12r-r8 All supported architectures

Related bugreports: #195390


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

2.  Impact Information


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


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.


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.

3.  Resolution Information


There is no known workaround at this time.


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

Code Listing 3.1: Resolution

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

4.  References


Page updated October 18, 2007

Summary: This is a Gentoo Linux Security Advisory

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