Sunday, August 26, 2007

Wfuzz, proxys and webserver scanning...

Today i was performing a pentest on a very big network. After struggling a bit i managed to upload files to a web server, an antivirus was running so many known tools didn't work, so it's time for more creativity. I pulled the http-proxy, a python based proxy developed by Edge-security, and compiled it into binary with py2exe, created an self-extracting zip, and uploaded to the server. I configured the proxy to listen on the port 53, as they leave that port unfiltered, neat :P

Well, so far so good, now i needed to know which machines were running webservers. I could have programmed a python scanner and upload it, but i was running out of time, so i went for wfuzz, the swiss knife for application testing (every body says their tool is a swiss knife), i used this command line to scan for web servers in the internal LAN through the proxy:

me ----> Server w/proxy ---->LAN

wfuzz -x serverip:53 -c -z range -r 1-254 --hc XXX -t 5 http://10.10.1.FUZZ

Some wfuzz switchs:

-x set proxy
--hc is used to hide the XXX error code from the results, as machines w/o webserver will fail the request (this is added on the new version).

With this command line, i will get every web server on the segment 10.10.1.X, i had to repeat this line for every segment the compromised server could reach, just that easy, fast and fun.

The http-proxy i used is part of the next framework that is being baked at Edge-security, stay tuned..

See you soon, Laramies.

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