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FUSE "fusermount" Mountpoint Handling Vulnerability

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Release Date:  2005-11-23    Views:  14,409

Secunia Advisory SA17691

Where:

Local system

Impact:

Privilege escalation

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

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.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Thomas Biege

Original Advisory:
http://sourceforge.net/project/shownotes.php?release_id=373087

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: FUSE "fusermount" Mountpoint Handling Vulnerability

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