Cissper- As far as I can tell the test first trys a TCP and then a ICMP packet. Loose source routing is an IP option. Usually these types of packets are simply blocked or ignored. It looks like the test sees if it gets a response back and if it does then flags the vuln. The test doesn’t go so far as to specify host to route through. You can test this using the traceroute -g switch. When you do that you are saying (eg: -g host1) route my packet through host1. Another way to test the lsrr is to use hping -G --lsrr. Most likely your host is simply ignoring the lsrr flag and replying to the echo request. -Scott -----Original Message----- From: plugins-writers-bounces@private [mailto:plugins-writers-bounces@private] On Behalf Of cissper Sent: Tuesday, March 02, 2004 6:55 PM To: security-basics@private; plugins-writers@private; full-disclosure@private Subject: [Plugins-writers] loose source routing problem I am lost here! Almost every time when I perform a nessus scan I get this odd vulnerability: loose source routing identified. I really don’t know how that script works but I have to analyse if this is a false positive or not. When I perform a manual traceroute (UDP) to the destination host, I do not get all gateways listed. It looks similar to that (just as an example): 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 2 lilacâdmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 3 lilacâdmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 4 ccngwânerâcc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 5 ccnânerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 7 * * * 8 * * * How can the nessus plug-in reporting this vulnerability get through to the destination host with loose source routing when I can get through with ICMP and UDP??? Can anybody explain me how this plug-in works? I just think it doesn’t work properly and always provides a false positive! In addiation, can anyone show how to reproduce what the script does? Your help is very much appreciated regards cissper loose source routing, unreliable results Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com ------------------------------------------------------------------------ --- Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off any course! All of our class sizes are guaranteed to be 10 students or less to facilitate one-on-one interaction with one of our expert instructors. Attend a course taught by an expert instructor with years of in-the-field pen testing experience in our state of the art hacking lab. Master the skills of an Ethical Hacker to better assess the security of your organization. Visit us at: http://www.infosecinstitute.com/courses/ethical_hacking_training.htm ------------------------------------------------------------------------ ---- _______________________________________________ Plugins-writers mailing list Plugins-writers@private http://mail.nessus.org/mailman/listinfo/plugins-writers _______________________________________________ Plugins-writers mailing list Plugins-writers@private http://mail.nessus.org/mailman/listinfo/plugins-writers
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