From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed May 01 2013 - 17:36:44 CDT

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TITLE:
FreeBSD NFS Server READDIR Request Processing Security Issue

SECUNIA ADVISORY ID:
SA53241

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/53241/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=53241

RELEASE DATE:
2013-05-01

DISCUSS ADVISORY:
http://secunia.com/advisories/53241/#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/53241/

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=53241

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 FreeBSD, which can be exploited
by malicious users to cause a DoS (Denial of Service) or potentially
compromise a vulnerable system.

The security issue is caused due to the NFS server not properly
verifying the file system entity type when processing READDIR
requests in the "nfsrvd_readdir()" function
(sys/fs/nfsserver/nfs_nfsdport.c) and can be exploited to force the
underlying file system to e.g. process a regular file as a directory
and subsequently cause a DoS condition or potentially execute
arbitrary code with kernel privileges.

Successful exploitation may allow execution of arbitrary code, but
requires the NFS server to use e.g. an UFS filesystem on a
little-endian server or a ZFS filesystem.

The security issue is reported in version 9.1.

SOLUTION:
Update FreeBSD or apply the patch.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Adam Nowacki.

ORIGINAL ADVISORY:
http://security.FreeBSD.org/advisories/FreeBSD-SA-13:05.nfsserver.asc

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
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