Secunia Security Advisory - 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.
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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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