TITLE:
FUSE "fusermount" Mountpoint Handling Vulnerability

SECUNIA ADVISORY ID:
SA17691

VERIFY ADVISORY:
http://secunia.com/advisories/17691/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
FUSE 2.x
http://secunia.com/product/5204/

DESCRIPTION:
Thomas Biege has reported a vulnerability in FUSE, which potentially
can be exploited by malicious, local users to perform certain actions
on a vulnerable system with escalated privileges.

The vulnerability is caused due to "fusermount" failing to properly
handle user supplied mountpoints that contain certain characters such
as newline, tab, and backslash. This can be exploited to corrupt the
"/etc/mtab" file and potentially allowing the attacker to set
unauthorized mount options.

Successful exploitation requires that "fusermount" is suid root. This
is the default on some Linux distributions.

SOLUTION:
Update to version 2.4.2.
http://sourceforge.net/project/showfiles.php?group_id=121684&package_id=132802

PROVIDED AND/OR DISCOVERED BY:
Thomas Biege

ORIGINAL ADVISORY:
http://sourceforge.net/project/shownotes.php?release_id=373087

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