File: 100000164.txt

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Rule: 

--
Sid: 
100000164

-- 
Summary: 
This event is generated when an ICMP packet crafted to exploit a denial of 
service vulnerability in the Linux kernel is detected.

--
Impact:
A denial of service will be caused against vulnerable hosts. If an attacker 
sends a continuous stream of such packets, the host can be prevented from 
functioning properly for a prolonged period of time.

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Detailed Information:
Linux kernel versions below 2.6.13 contain a flaw which will result in a null 
pointer dereference when processing ICMP packets that contain invalid SCTP 
data. In order to be vulnerable, a host must have SCTP enabled.

--
Affected Systems:
Any Linux system with a kernel version < 2.6.13 with SCTP enabled.

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Attack Scenarios:
An attacker could use a script to send malformed packets to a vulnerable host.

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Ease of Attack:
Simple, as a publicly available exploit script exists.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Upgrade Linux systems' kernel to version 2.6.13 or higher. Alternately, disable 
SCTP or use a firewall to block ICMP traffic at your network's border.

--
Contributors:
rmkml
Sourcefire Research Team

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Additional References
Other:
http://oss.sgi.com/projects/netdev/archive/2005-07/msg00142.html

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