GLSA 201803-02: util-linux: User-assisted execution of arbitrary code

http://security.gentoo.org/

Severity:	high
Title:	util-linux: User-assisted execution of arbitrary code
Date:	03/07/2018
Bugs:	#649812
ID:	201803-02

Synopsis

A vulnerability was discovered in util-linux, which could potentially lead to the execution of arbitrary code.

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-apps/util-linux	< 2.30.2-r1	>= 2.30.2-r1	All supported architectures

Description

It was discovered that the umount bash-completion as provided by util-linux does not escap mount point paths.

Impact

An attacker controlling a volume label could entice a user with privileges to mount/umount filesystems to use umount command with auto completion, possibly resulting in execution of arbitrary code with root privileges.

Workaround

Disable Bash-completion or remove “/usr/share/bash-completion/completions/umount”.

Resolution

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

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=sys-apps/util-linux-2.30.2-r1"

References

CVE-2018-7738

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201803-02.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.