[SA21820] Linux Kernel ULE Packet Handling Denial of Service

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TITLE:
Linux Kernel ULE Packet Handling Denial of Service

SECUNIA ADVISORY ID:
SA21820

VERIFY ADVISORY:
http://secunia.com/advisories/21820/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

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

DESCRIPTION:
Ang Way Chuang has reported a vulnerability in Linux Kernel, which
can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error in the ULE
(Unidirectional Lightweight Encapsulation) decapsulation code when
processing ULE packets. This can be exploited to crash the system by
sending a malicious ULE packet with an SNDU (Sub Network Data Unit)
size of 0.

The vulnerability has been reported in version 2.6.17.11. Other
versions may also be affected.

SOLUTION:
Secunia is currently not aware of an official version fixing the
vulnerability.

PROVIDED AND/OR DISCOVERED BY:
Ang Way Chuang

ORIGINAL ADVISORY:
http://lkml.org/lkml/2006/8/20/278

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