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TITLE:
Linux Kernel NFSv4 "MAY_EXEC" Security Bypass

SECUNIA ADVISORY ID:
SA35106

VERIFY ADVISORY:
http://secunia.com/advisories/35106/

DESCRIPTION:
A security issue has been reported in the Linux Kernel, which can be
exploited by malicious, local users to bypass certain security
restrictions.

The security issue is caused due to the "nfs_permission()" function
in fs/nfs/dir.c not correctly checking the "MAY_EXEC" permission.
This can be exploited to e.g. execute scripts on an NFSv4 share
without proper permissions, but requires that the server supports
atomic open.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Simon Vallet and Frank Filz

ORIGINAL ADVISORY:
Frank Filz:
http://article.gmane.org/gmane.linux.nfs/26592

Simon Vallet:
http://linux-nfs.org/pipermail/nfsv4/2006-November/005313.html
http://bugzilla.linux-nfs.org/show_bug.cgi?id=131

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