loose source routing problem

[cissper <cissper () yahoo com au>]

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



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