TITLE:
Linux Kernel SNMP NAT Helper Denial of Service

SECUNIA ADVISORY ID:
SA20225

VERIFY ADVISORY:
http://secunia.com/advisories/20225/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

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

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

The vulnerability is caused due to some errors within the
"snmp_trap_decode()" function when handling certain SNMP packets.
This can be exploited to cause memory corruption due to incorrect
freeing of memory, which can potentially cause the system to crash.

Successful exploitation requires that the "ip_nat_snmp_basic" module
is loaded and that traffic NAT is enabled on port 161 or 162.

SOLUTION:
Update to version 2.6.16.18.
http://kernel.org/

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
Kernel.org:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.18
http://www.kernel.org/git/?p=linux/kernel/git/stable/linux-2.6.16.y.git;a=commit;h=1db6b5a66e93ff125ab871d6b3f7363412cc87e8

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