Penetration Testing mailing list archives
Re: loose source routed IP packets
From: "Don Parker" <dparker () rigelksecurity com>
Date: Wed, 25 Feb 2004 15:10:43 -0500 (EST)
Hi there, I am a little confused here actually. Is the operating system itself accepting the lsrr packets? or is it the gateway router/firewall accepting it? I found last year that all win32 tcp/ip stacks do accept lsrr packets by default *but* will only reverse the first hop in that series. I raised this issue with MS Security last year and was told it would be fixed in the next service pack. We shall see if they did. I am most curious as to what o/s it is your talkign about here as most linux and unix installs disallow lsrr packets by default. Cheers! Don ------------------------------------------- Don Parker, GCIA Intrusion Detection Specialist Rigel Kent Security & Advisory Services Inc www.rigelksecurity.com ph :613.249.8340 fax:613.249.8319 -------------------------------------------- On Feb 25, <christophstrizik () yahoo com au> wrote: Dear fellows During one of my pen-tests I encountered the following vulnerability: The remote host accepts loose source routed IP packets. The feature was designed for testing purpose. An attacker may use it to circumvent poorly designed IP filtering and exploit another flaw. However, it is not dangerous by itself. Solution : drop source routed packets on this host or on other ingress routers or firewalls. Risk factor : Low Nessus ID : 11834 \\\\\\\\\\\\\\\\\\\\\\\\\\\\ I think there is some sort of filtering device between the source and destination host. I also suspect that the filtering device just drops the packets and the nessus plug-in assumes the packet could be successfully delivered. Anybody any hints on that one? Kind regards, Christoph --------------------------------------------------------------------------- ---------------------------------------------------------------------------- --------------------------------------------------------------------------- ----------------------------------------------------------------------------
Current thread:
- loose source routed IP packets christophstrizik (Feb 25)
- <Possible follow-ups>
- Re: loose source routed IP packets Don Parker (Feb 25)
- Re: loose source routed IP packets Chris . McNab (Feb 26)