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TITLE:
XFS Acl Recursive Symlink Processing Security Issue

SECUNIA ADVISORY ID:
SA37907

VERIFY ADVISORY:
http://secunia.com/advisories/37907/

DESCRIPTION:
A security issue has been reported in XFS Acl, which can be exploited
by malicious, local users to perform certain actions with escalated
privileges.

The security issue is caused due to the "-P" command-line parameter
failing to restrict symlink processing on recursive "setfacl" or
"getfacl" operations. This can be exploited to potentially e.g.
change the permissions of normally restricted files via symlink
attacks.

The security issue is reported in version 2.2.47. Other versions may
also be affected.

SOLUTION:
Restrict local access to trusted users only.

Fixed in the development repository.

PROVIDED AND/OR DISCOVERED BY:
Reported Johan Ymerson in an XFS Acl bug report.

ORIGINAL ADVISORY:
http://oss.sgi.com/bugzilla/show_bug.cgi?id=790

OTHER REFERENCES:
http://www.openwall.com/lists/oss-security/2009/12/23/2

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