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TCP Null Scan using Scapy

开发者 https://www.devze.com 2023-01-23 16:21 出处:网络
Can someone guide me on how to send packets in Scapy to an ip address, with all flags in the TCP header set to null ? I have so far tried sending packets without specifying which flags to set, but it

Can someone guide me on how to send packets in Scapy to an ip address, with all flags in the TCP header set to null ? I have so far tried sending packets without specifying which flags to set, but it seems to set the Syn flag everytime I send the packet.

I would like to know i开发者_如何学运维t so that I can learn more about TCP Null Scans. Would be grateful for ur help and guidance.


I haven't used Scapy, but from a quick scan of the documentation there is an example of creating a TCP packet while specifying which flags to set, on this page of the docs:

http://www.secdev.org/projects/scapy/doc/usage.html#simple-one-liners
sr( IP(dst="192.168.1.*")/TCP(dport=80,flags="S") )

Perhaps you could try a command like that, with an empty string ""? i.e. TCP(dport=80,flags="") ?


If you don't want to actually send a TCP header, you'd be better off just setting the protocol of the IP packet and gluing a string of zeros on top of it.

sr( IP(dst="192.168.1.", proto="TCP")/"\0"*50)

Edit: I'm not actually positive on the syntax, you might have to use the protocol number instead of "TCP"


Thank you Andy and Jdizzle for the suggestions.

I tried out what Andy Recommended earlier itself, but the packet somehow seemed to have the Syn Flag set, when i checked it on wireshark.

The good news is, i solved the problem, the flags can be set to null, at the instance when you create the packet to be sent.

create a packet --> a=TCP() and then setting the flag to zero by --> a.flags=0 there are many other attributes that you can preset in this manner before preparing the packet to be sent over the network. You can view these attributes by --> ls(a)

where a=the name of the packet.

This worked successfully !

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