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TITLE:
util-linux umount "-r" Re-Mounting Security Issue

SECUNIA ADVISORY ID:
SA16785

VERIFY ADVISORY:
http://secunia.com/advisories/16785/

CRITICAL:
Not critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
util-linux 2.x
http://secunia.com/product/5692/

DESCRIPTION:
David Watson has reported a security issue in util-linux, which
potentially can be exploited by malicious, local users to gain
escalated privileges.

The problem is that non-root users can call umount with the "-r" flag
on user-mountable volumes. This can be exploited to cause a
user-mountable volume to be re-mounted read-only and cause the
nosuid, noexec, and nodev flags to be cleared.

This can further be exploited to call a setuid binary on the
user-mountable volume.

Successful exploitation requires privileges to unmount a
user-mountable file system.

The security issue has been reported in versions 2.8 through 2.12q,
2.13-pre1, and 2.13-pre2.

SOLUTION:
The security issue has been fixed in version 2.12r-pre1 and
2.13-pre3.

PROVIDED AND/OR DISCOVERED BY:
David Watson

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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