Rule:  

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Sid:
281

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Summary:
This event is generated when an attempt is made to issue a Denial of Service (DoS) attack that causes some Ascend routers to reboot.

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Impact:
Denial of Service. Traffic between network segments or between internal and external networks can be disrupted.

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Detailed Information:
Some Ascend routers run configuration software that is able to locate other Ascend routers by broadcasting on UDP port 9 (discard).  This port is listened on by the Java Configurator tool.  A packet with a specially crafted payload can cause the routers to reboot.

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Affected Systems:
Lucent Ascend MAX Router 5.0 and previous
Lucent Ascend Pipeline Router 6.0 and previous
Lucent Ascend Pipeline Router 6.0 and previous

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Attack Scenarios:
Ascend routers can be forced to reboot remotely without authorization. Since the offending packet is UDP (which is not connection oriented), the sending address can be easily spoofed.  

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Ease of Attack:
Simple.  An exploit is available.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
An upgrade is available from the manufacturer.  Filtering traffic to port 9 will also prevent this exploit.

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Contributors:
Original Rule Writer Unknown
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by Steven Alexander<alexander.s@mccd.edu>

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Additional References:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0060

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