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TITLE:
FUSE "fusermount" Arbitrary Unmount Security Issue

SECUNIA ADVISORY ID:
SA42961

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42961/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42961

RELEASE DATE:
2011-01-21

DISCUSS ADVISORY:
http://secunia.com/advisories/42961/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/42961/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=42961

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A security issue has been reported in FUSE,  which can be exploited
by malicious, local users to cause a DoS (Denial of Service).

The security issue is caused due an error within the "fusermount"
utility when performing unmount operations, which can be exploited to
e.g. unmount arbitrary mounts via symlink attacks.

The security issue is reported in version 2.8.5. Other versions may
also be affected.

SOLUTION:
Fixed in the GIT repository.

Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

PROVIDED AND/OR DISCOVERED BY:
halfdog

ORIGINAL ADVISORY:
http://www.halfdog.net/Security/FuseTimerace/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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

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