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