Re: Session ID Analysis

["M.D.Mufambisi" <mufambisi () gmail com>]

thanks portswigger. I will do that. All im looking for is a scientific
way of indeed proving the non randomness of the token and if possible
even predict next tokens. i analysed 25000 tokens wat i just posted
here were a few so that u get an idea. I will send the entire file
soon.

On 8/13/10, PortSwigger <mail () portswigger net> wrote:
> Burp isn't basing its conclusion on the first 50 bytes which are invariant.
> It analyses the whole token, and bases its conclusion on the number of bits
> which pass the statistical tests for randomness. Read the help file for Burp
> Sequencer to understand exactly how it works.
>
> Even if a token contains a lot of invariant material, it can still exhibit
> strong entropy if there enough other bits which are sufficiently random. But
> you can't tell whether variant parts of a token are random just by looking -
> you need to run proper tests or, better, look at the source code for the
> algorithm.
>
> In this instance, the application is serving duplicated successive tokens to
> you, which will be affecting Burp's analysis. You need to gather samples
> from two locations simultaneously and first check whether the same token is
> ever issued to two different users. If so, this is a serious defect in
> itself. If not, then you should strip the duplicated successive tokens from
> your sample, and reload it into Sequencer to reanalyse:
>
> cat sessids.txt | uniq > sessids2.txt
>
> One other point: while Burp will let you run its analysis on a small sample,
> you should gather several thousand tokens to ensure the results of the
> statistical tests are at all reliable.
>
> Cheers
> PortSwigger
>
>
> On 12 Aug 2010, at 01:36, M.D.Mufambisi wrote:
>
> > Hi,
> >
> > I have been analysing session IDs generated by a test site (for
> > security practice) using burp. Burp reports that the randomnes of the
> > sessionids is extremely poor. having a look at the session Ids, i can
> > tell the first 50 or so bytes are about the same on all sessionIDs.
> > And the other 10 appear to change. I bet burp got to this conclusion
> > based on the first 50 bytes or so. Suppose the developer came and said
> > yes, the first 50bytes are based on a calculation by date (hence they
> > are all teh same) but the last 10 bytes are extremely random...how
> > would i be able to confirm or deny this? I will paste a couple of the
> > sessionIds here and I would be most grateful if I got ideas of what
> > the changing bytes could be. Ultimately i want to see if i will be
> > able to predict sessionIDs.
> >
> > May i also kindly have suggestions of software that i can use to find
> > solutions to the above or to analyse sessionIds. thanks. I will paste
> > a sample of the session Ids here for your perusal.
> >
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdexuhbbM/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdexuhbbM/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TcO5qjLLF8O/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TcO5qjLLF8O/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tdu9rhLHK9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tdu9rhLHK9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tde5qhLbF8ezAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tde5qhLbF8ezAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tculug7nL9unOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tculug7nL9unOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tculug7nL9unOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TeOhpgrfM8OjHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TeOhpgrfM8OjHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Td+lpjLPL9+fGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Td+lpjLPL9+fGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdelvhLbM/ebEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdelvhLbM/ebEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tc+ttgLHE9+zDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tc+ttgLHE9+zDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TcOpphLPK/e/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TcOpphLPK/e/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tdutph7jP/OrBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tdutph7jP/OrBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdepohrfL9OzAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdepohrfL9OzAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdepohrfL9OzAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TcuVsjbbI8+nOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TcuVsjbbI8+nOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TeORvjLXL/ejHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TeORvjLXL/ejHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Td+VshLDI/OfGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Td+VshLDI/OfGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdeVthrTE8ObEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+TdeVthrTE8ObEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tcu1jg7jJ/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tcu1jg7jJ/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdeRsgLfI8O/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdeRsgLfI8O/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcOVsgrLN9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcOVsgrLN9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcOVsgrLN9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TduRvjbHI8ezAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TduRvjbHI8ezAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tdu5qhrDO9unOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tdu5qhrDO9unOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdexjhrnJ8OjHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdexjhrnJ8OjHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcO1jgLTO9+fGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcO1jgLTO9+fGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tee5qgrjJ/ebEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tee5qgrjJ/ebEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+hphLLP9+zDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+hphLLP9+zDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdO5igrTN/e/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdO5igrTN/e/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdO5igrTN/e/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tc+9ijLDE/OrBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tc+9ijLDE/OrBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tee5tjLjO9OzAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tee5tjLjO9OzAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdupogbjF8+nOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdupogbjF8+nOPaw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdelrgLbO/ejHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdelrgLbO/ejHP6s=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcOprgrLF/OfGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcOprgrLF/OfGPqw=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TeepojLnP8ObEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TeepojLnP8ObEOa0=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+RvhrPM/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+RvhrPM/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+RvhrPM/OzDOqI=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdexohLnF8O/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TdexohLnF8O/CP6M=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcO1ohrTK9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcO1ohrTK9+rBMa4=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TduxrgbPF8ezAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TduxrgbPF8ezAMKM=
> > tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+9vjLLL9unOPaw=
> >
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-- 
Regards,

Munyaradzi D. Mufambisi, CISA, CISM, CISSP

------------------------------------------------------------------------
This list is sponsored by: Information Assurance Certification Review Board

Prove to peers and potential employers without a doubt that you can actually do a proper penetration test. IACRB CPT 
and CEPT certs require a full practical examination in order to become certified. 

http://www.iacertification.org
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