Tricky exploit - a penetration test puzzle

[Ronen Z <ronen () quaji com>]

In a recent application security audit for a web-site I came across a big,
blaring breach.

while it's always fun to find a good vulnerability, it turned out to be
quite tricky to actually exploit it. The trickiness was not due to good
security practices but to pure (un)luck (depending on whose point of view).
It seemed every angle I tried was off by just a tiny bit.

Eventually I managed to find an interesting multiphase exploit vector, and I
think it makes for some interesting tinkering/reading.  I've created a
mock-up replica of the vulnerable web-site to allow for testing and
analysis. After reading the vulnerability introductory section you may wish
to try your wit against the mock-site and find it yourself, before reading
on to the detailed exploit write-up.


Write up here:
http://blog.quaji.com/2011/02/tricky-exploit-penetration-test-puzzle.html


Ronen Zilberman

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