Security Activity Bulletin

TCP/IP and UDP Network Traffic with a Source Port of 0

 
Threat Type:IntelliShield: Applied Mitigation Bulletin
IntelliShield ID:19935
Version:2
First Published:2010 February 17 16:59 GMT
Last Published:2010 March 15 12:31 GMT
Port: 0
Urgency:Weakness Found
Credibility:Confirmed
Severity:Harassment
 
Version Summary:

Malformed UDP network traffic with a source port of 0 may also indicate malicious activity.

 

Description
 

Malformed TCP/IP and UDP?network traffic may have a source port of 0.? TCP and UDP port 0 is a reserved port and should not normally be assigned.? Traffic with this configuration may indicate malicious or abnormal activity.? Intrusion detection or intrusion prevention devices may detect and/or block such traffic using signatures.? Administrators should be aware that ongoing transmissions of TCP/IP and UDP packets with a source port of 0 could indicate ongoing attacks, such as spoofing or an attempt to identify a targeted host's operating system.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
24199/0TCP Source Port 0S4772010 Mar 12 
24199/1UDP Source Port 0S4772010 Mar 12 
 
Alert History
 

Version 1, February 17, 2010, 11:59 AM: Malformed network traffic with a source port of 0 may indicate malicious activity.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
IntelliShieldSecurity Activity Bulletin Original Release Base

Associated Products:
N/A




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