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SEC Consult SA-20241107-0 :: Multiple Vulnerabilities in HASOMED Elefant and Elefant Software Updater Unsafe eval() in TestRail CLI IT Security and Insecurity Portal www.waraxe.us Forum Index -> General discussion -> Can someone explain something about DNS? View previous topic :: View next topic Can someone explain something about DNS? Posted: Sun Sep 07, 2008 2:17 pm ZiPo Advanced user Joined: Jul 08, 2008 Posts: 86 First of all i am total noob considering DNS stuff. I know some basic, i understand why DNS is used and i have read a lot on that subject but there are few things that i don't quite understand (ok ok there is a lot that i dont understand...but slowly learing). Anyway the questions are: 1. DNS communicate with browser over UDP protocol, if that is true then I am able to custom craft the packet that need to be send containing all the data that i want to send including faked IP? Probably this will not work, not fot the IP part at least 2.How does that packet looks like, or where could i learn more about the packet that is sent from my web browser to the nearest DNS? Maybe i got all of this wrong, and I understand that there is no real use of crafting packet and send it to the DNS cos if it communicate over UDP and i insert some fake IP DNS will reply to the IP provided and not to me. However if you can give me some links to read or share some info on subjects mentioned above i would be grateful. Thank you in advance. Posted: Sun Sep 07, 2008 5:30 pm waraxe Site admin Joined: May 11, 2004 Posts: 2407 Location: Estonia, Tartu You can start from here: http://en.wikipedia.org/wiki/DNS_cache_poisoning http://www.trusteer.com/files/Windows_DNS_Cache_Poisoning.pdf http://www.lurhq.com/dnscache.pdf http://www.securityfocus.com/brief/807 Basically, old-style DNS responses can be faked by attacker ... Posted: Sun Sep 07, 2008 6:11 pm ZiPo Advanced user Joined: Jul 08, 2008 Posts: 86 Thanks a lot Waraxe Posted: Wed Sep 10, 2008 9:15 pm ZiPo Advanced user Joined: Jul 08, 2008 Posts: 86 Hi again I figured out DNS (now i know a little bit more then before) and i managed to craft nice UDP packet with Adress request and spoffed IP, however i hit another wall (Ingress filtering). Is there any way to avoid/bypass around that one without hacking into my ISP gateway. Finding another ISP is an option, but i just wonder if there is any known way to do this? Thanks in advance Posted: Wed Sep 10, 2008 10:56 pm waraxe Site admin Joined: May 11, 2004 Posts: 2407 Location: Estonia, Tartu Any serious ISP will apply measures against IP src address spoofing. But you can always pwn some remote machine in third world country, where IT security is not so good and try to send spoofed packets from there. Posted: Thu Sep 11, 2008 5:21 am ZiPo Advanced user Joined: Jul 08, 2008 Posts: 86 Yes i was thinking about that also. Thank you Waraxe. 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