Full Disclosure mailing list archives
Re: Re: ICMP Destination Unreachable Port Unreachable
From: "Adriel T. Desautels" <simon () snosoft com>
Date: Tue, 15 Aug 2006 18:53:09 -0400
Darren, I did notice what type of packet it was and I also know what the packet signifies. The issue that I am having is that there has never been any outbound UDP activity to the host that is replying to this network. The payloads of the ICMP packets are a bit weird too, containing either X'es or |'s or encoded strings. What I am trying to figure out is if anyone here recognizes these types of payloads and knows what could be generating them? so just to be clear... I want info about the payload not about ICMP! Darren Bounds wrote:
Dude, In case you've failed to notice, this is an ICMP port unreachable message. It's sent in response to a UDP packet destined for an unavailable UDP port. The port '0' referenced in the event source/destination is meaningless as ICMP doesn't use source and destination ports (it is always '0'). The payload of the ICMP unreachable message contains original IP header (of the initial UDP packet) and at least 64 bits (8 bytes) of original data datagram. The size of data echoed will vary depending on the implementation. On 8/15/06, Dude VanWinkle <dudevanwinkle () gmail com> wrote:On 8/15/06, Julio Cesar Fort <julio () rfdslabs com br> wrote:Dude VanWinkle,<snip> ----------------------------- Looks to me like they are using port 0. http://www.grc.com/port_0.htm -JP*NEVER TRUST* Steve Gibson. I bet he smokes crack. See http://attrition.org/errata/charlatan.html#gibson for more details.thanks for the tip! Still, I cant seem to help but think there is something to this port 0 thingy http://www.networkpenetration.com/port0.html <snip> 3. Port 0 OS Fingerprinting --------------------------- As port 0 is reserverd for special use as stated in RFC 1700. Coupled with the fact that this port number is reassigned by the OS, no traffic should flow over the internet using this port. As the specifics are not clear different OS's have differnet ways of handling traffic using port 0 thus they can be fingerprinted. -------------------------------------------- I guess that is just a reaction to traffic and not actual traffic via port 0, but still nifty info -JP _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/------------------------------------------------------------------------ _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
-- Regards, Adriel T. Desautels SNOsoft Research Team Office: 617-924-4510 || Mobile : 857-636-8882 ---------------------------------------------- Vulnerability Research and Exploit Development BullGuard Anti-virus has scanned this e-mail and found it clean. Try BullGuard for free: www.bullguard.com _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- ICMP Destination Unreachable Port Unreachable Adriel T. Desautels (Aug 15)
- Re: ICMP Destination Unreachable Port Unreachable Dude VanWinkle (Aug 15)
- <Possible follow-ups>
- Re: ICMP Destination Unreachable Port Unreachable Richard Bejtlich (Aug 15)
- Re: ICMP Destination Unreachable Port Unreachable Peter Dawson (Aug 15)
- Re: ICMP Destination Unreachable Port Unreachable Julio Cesar Fort (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Dude VanWinkle (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Adriel T. Desautels (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Robert Kim Wireless Internet Advisor (Aug 16)
- Re: Re: ICMP Destination Unreachable Port Unreachable Darren Bounds (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Adriel T. Desautels (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Darren Bounds (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Adriel T. Desautels (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Dude VanWinkle (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Dude VanWinkle (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Darren Bounds (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Scott Renna (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Adriel T. Desautels (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Valdis . Kletnieks (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Adriel T. Desautels (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Valdis . Kletnieks (Aug 15)
- Re: Re: ICMP Destination Unreachable Port Unreachable Barrie Dempster (Aug 16)