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TITLE:
Open Virtual Machine Tools RLIMIT_FSIZE Security Issue

SECUNIA ADVISORY ID:
SA43798

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43798/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43798

RELEASE DATE:
2011-03-16

DISCUSS ADVISORY:
http://secunia.com/advisories/43798/#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/43798/

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=43798

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 Open Virtual Machine Tools,
which can be exploited by malicious, local users to cause a DoS
(Denial of Service).

The security is caused due to the "mount.vmhgfs" utility not properly
handling the SIGXFSZ signal when e.g. adding new file system
descriptions to "/etc/mtab", which can be exploited to e.g. corrupt
the /etc/mtab file by setting a low RLIMIT_FSIZE limit.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Dan Rosenberg

ORIGINAL ADVISORY:
http://www.openwall.com/lists/oss-security/2011/03/04/9
http://www.openwall.com/lists/oss-security/2011/03/15/6

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.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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