Hello Don Lewis, 22.01.00 13:58, you wrote: explanation and code for stream.c issues; D> } Intruder sends SYN packet and then sends, lets say 1000 ACK packets to D> } the same port from same port and source address. SYN packet will open D> } ipfilter to pass all others packets. This attack doesn't need D> } randomization for each packet. D> Instead of producing RST responses, this will produce ACKs. Your earlier D> comment about this prompted my comment in another thread about the D> possible need to rate limit ACK packets. This will not produce ACK packets, if ACK send by intruder doesn't conform sequence number in the SYN/ACK response of victim. Original stream.c used packet.tcp.th_ack = 0; i changed to packet.tcp.th_ack = random(); for ACK packets. But it's not principial - victim will reply RST for this packet in most cases. +=-=-=-=-=-=-=-=-=+ |Vladimir Dubrovin| | Sandy Info, ISP | +=-=-=-=-=-=-=-=-=+
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:29:57 PDT