Re: Session ID Analysis

[Steve Pinkham <steve.pinkham () gmail com>]

First glance shows (at least one) problem.
Sending the same sessionID a few times in a row is a huge problem, and
will put burp analyzer in a tizzy, for good reason.

You don't get any less random then the same cookie over and over again.
Burp should easily show you this in the statistical analysis, but in
this case you only need your eyeballs.

On 08/11/2010 08:36 PM, 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=
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> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tdu9rhLHK9+rBMa4=
> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tdu9rhLHK9+rBMa4=
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> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37D1DSfcgLqokBpnTBSEX+F+Tde5qhLbF8ezAMKM=
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> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+TcO1jgLTO9+fGPqw=
> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tee5qgrjJ/ebEOa0=
> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Tee5qgrjJ/ebEOa0=
> tQ0mWP3eTWy2dsm9ZEOvRB7djuKHP8lob8S37DxKSfcgLqokBpnTBSEX+F+Td+hphLLP9+zDOqI=
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>
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-- 
 | Steven Pinkham, Security Researcher    |
 | http://www.mavensecurity.com           |
 | GPG public key ID CD31CAFB             |

------------------------------------------------------------------------
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
------------------------------------------------------------------------