Re: bugfix : wrong IPIDs generation algorithm

[Thierry Zoller <Thierry () Zoller lu>]

Thanks Guillaume,

I  came  across  this  bug  recently  and was surprised nmap failed at
recognising a simple incremental  IPID gen stack.

GP> Hi,

GP> While working on a tool called IpMorph (it's purpose is to fool all
GP> active and passive OSFP tools) i noticed Nmap didn't always properly
GP> analyse the IPIDs generation algorithm. Notably, in the array of IPIDs
GP> Nmap gathers, the second one was sometimes replaced by the last one,
GP> resulting in a difference way over 1 between the first two IPIDs, thus
GP> resulting in Nmap concluding the IPIDs were generated in an unknown
GP> manner instead of incrementally.

GP> I noticed in osscan2.cc what looks like an copy-paste error, so I fixed
GP> that, and now all works fine. You will find the patch attached.

GP> Sincerely,
GP> Guillaume PRIGENT




-- 
http://secdev.zoller.lu
Thierry Zoller


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