in November`99 more or less... i've discovered 5 type of new stealth scan, with the modification of flags used normally on XMAS stealth scan. the five type of packets that can be used for stealth scanning, and isn't logged from the normal tcplogd/scanlogger have this flag: URG PUSH URG+FIN PUSH+FIN URG+PUSH this flag on packet, such FIN, XMAS (fin+urg+psh), and NULL scan (no one flag set) cause the reply RST+ACK if port is closed, and no reply if port is open. this is efective only against *nix system i don't think that is an important tecnical notice... but most tcp logger must be upgraded/reconfigurated. i've coded patch for nmap-2.12, check http://vecna.unix.kg Bye. vecna
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:28:40 PDT