Aztech router DSL600EU IP and ARP spoof

The Aztech DSL600EU is vulnerable to IP|ARP spoof.

Example:

Webinterface disabled in WAN to LAN or EXT to IN zone but
the port 80 is not blocked, one malicious client can be send
one SYN inundation and calculate the sequence number (IP
spoof) and conect to the web interface.

By AchedDamiman