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TITLE:
Linux Kernel XDR Encode/Decode Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA16406

VERIFY ADVISORY:
http://secunia.com/advisories/16406/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Florian Weimer has reported a vulnerability in the Linux kernel,
which can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the
"xdr_xcode_array2()" function when encoding or decoding XDR arrays.
This can be exploited to cause a buffer overflow via specially
crafted XDR data for the nfsacl protocol.

The vulnerability has been reported in version 2.6.12. Other versions
may also be affected.

SOLUTION:
The vulnerability has been fixed in versions 2.6.13-rc1 and later.

PROVIDED AND/OR DISCOVERED BY:
Florian Weimer

ORIGINAL ADVISORY:
Kernel.org:
http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.13-rc1

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About:
This Advisory was delivered by Secunia as a free service to help
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