Expected behaviour for Null, FIN and XMAS scans

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Expected behaviour for Null, FIN and XMAS scans

L2 Linker

Running through a few very basics tests to prove Zone Protection etc with a customer, what is the expected default behaviour for reconaissance scans such as Null, FIN and XMAS scans?

 

Currently I can get the following nmap commands to run without issue and no logs beyond ping or icmp.

nmap -sX

nmap -sF

nmap -sN

 

What would be the appropriate measure to block/alert these? assuming there is a cryptic box top tick under the ZPP dialogs

2 accepted solutions

Accepted Solutions

Cyber Elite
Cyber Elite

'rogue' flags are removed from packets without needing a Zone Protection Profile in place

Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization

View solution in original post

Confirming that a packet capture on the "victim" machine shows no packets with TCP flags for ACK, FIN or PSH set when performing Christmas Tree. Packet capture on Firewall at stage "Receive" shows that the packets are indeed received by the firewall.

 

nmap command used:

nmap -sX -v [host]

View solution in original post

3 REPLIES 3

Cyber Elite
Cyber Elite

'rogue' flags are removed from packets without needing a Zone Protection Profile in place

Tom Piens
PANgurus - Strata specialist; config reviews, policy optimization

It's probably somewhere subtle, but is this documented anywhere?

Confirming that a packet capture on the "victim" machine shows no packets with TCP flags for ACK, FIN or PSH set when performing Christmas Tree. Packet capture on Firewall at stage "Receive" shows that the packets are indeed received by the firewall.

 

nmap command used:

nmap -sX -v [host]

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