Preface: TCP SYN with URG flagLogo -Internet Security Systems

TCP SYN with URG flag

advICE :Intrusions : 2000317
 FAQ
Oh my gosh, I'm being HACKED!!!
How do I report the hacker to my ISP?
I'm seeing lots of attacks, is this normal?

Summary The intruder sends an unusual combination of bits in the TCP connection header.

Details

Some TCP/IP implementations will hang when receiving many such frames.

 more information
Bugtraq Advisory  
 

 parametric information
portThe TCP destination port
flagsThe TCP flags from the offending frame. The flags are: S (SYN), F (FIN), R (RESET), P (PUSH), A (ACK), U (URGENT), 4 (low-order unused bit), 8 (high-order unused bit)
optionsThe TCP options from the offending frame. The options are displayed as "option-value", separated by commas. No-ops are not displayed

 
Version appeared: 2.1 

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