|06 Nov 2013||#1|
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Spike in traffic with TCP source port zero has researchers worried
A significant increase this weekend in TCP traffic with source port zero detected could be part of reconnaissance efforts in preparation for more serious attacks, according to security researchers from Cisco Systems.
There’s usually no service on a system that listens on port 0 (zero), because according to the Transport Protocol port assignments by the Internet Assigned Numbers Authority (IANA), port zero is a “reserved port” and should not be used. Therefore receiving TCP (Transmission Control Protocol) traffic with a source port of zero is unusual.
“Generally speaking port zero traffic can be indicative of a possible reconnaissance attack, and may be a precursor to more serious penetration attempts,” Craig Williams, technical lead in the threat research team at Cisco, said Monday in a blog post.
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