Vitaly Osipov wrote: > > this is a sample of your packet: > > #(1 - 29543) [2001-06-19 01:34:54] [arachNIDS/203] BACKDOOR Q access > IPv4: 255.255.255.255 -> x.x.x.x > hlen=5 TOS=0 dlen=43 ID=0 flags=0 offset=0 TTL=13 chksum=45614 > TCP: port=31337 -> dport: 515 flags=***A*R** seq=0 > ack=0 off=5 res=0 win=0 urp=0 chksum=25942 > Payload: length = 3 > > 000 : 63 6B 6F cko Yeah, those are the RST ones. They crack me up even more than the more common SYN ones. In order for the RST ones to do anything, the victim must not only respond to a packet with the broadcast address as the source, but it would have to respond to a RST which any sane TCP implementation will never, ever, ever do. I see a lot more of the SYN ones. They look like, 17:22:40.938837 255.255.255.255.31337 > AAA.BBB.CC4.192.515: S 100:100(0) win 512 (ttl 242, id 62128) 03:16:51.069740 255.255.255.255.31337 > AAA.BBB.CC5.161.515: S 100:100(0) win 512 (ttl 242, id 62128) Note the TCP sequence number and IP ID. They are always the same. (These two just happen to have the same TTL, but I get a distribution). -- Crist J. Clark Network Security Engineer crist.clarkat_private Globalstar, L.P. (408) 933-4387 FAX: (408) 933-4926 The information contained in this e-mail message is confidential, intended only for the use of the individual or entity named above. If the reader of this e-mail is not the intended recipient, or the employee or agent responsible to deliver it to the intended recipient, you are hereby notified that any review, dissemination, distribution or copying of this communication is strictly prohibited. If you have received this e-mail in error, please contact postmasterat_private ---------------------------------------------------------------------------- This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com
This archive was generated by hypermail 2b30 : Sat Jul 07 2001 - 10:18:44 PDT