Security Basics mailing list archives
HTTP tunneling to bypass proxy filter
From: "uglyhunK" <uglyhunK () hippiecluB org>
Date: Sat, 19 Apr 2008 19:09:01 +0530
Recently I was challenged by network admin to bypass corporate HTTP proxy filter. Easier option would have been to download one of many HTTP tunnel clients but that is ruled out as all the sites are blocked. I didn't want to email the installation file as there is a strict monitoring policy to using email and "leaving no traces" is one of the primary conditions. Only option left was to write my own HTTP tunneling client and being a developer I have access to JDK. Server component is written in PHP and it works like a charm; all the communication is encoded in base64 (though not the best way to obfuscate data). It took me just 10 days to successfully bypass the proxy filter and access literally all the websites except https ones. Just for the info, this is @ one of the largest American banks. So, I won the first round and now I threw a challenge @ him to identify this kinda of tunneled data and block it successfully. I'm not sure if he can do this, but, would like to know from you guys if there is any way for the admin to block me from using custom tunnel client. -uglyhunK
Current thread:
- HTTP tunneling to bypass proxy filter uglyhunK (Apr 21)
- RE: HTTP tunneling to bypass proxy filter Brandon Louder (Apr 21)
- RE: HTTP tunneling to bypass proxy filter Hayes, Ian (Apr 22)
- Re: HTTP tunneling to bypass proxy filter Tsu (Apr 22)
- Re: HTTP tunneling to bypass proxy filter Siddharth Upmanyu (Apr 22)
- Re: HTTP tunneling to bypass proxy filter Siddharth Upmanyu (Apr 22)
- Re: HTTP tunneling to bypass proxy filter Francisco Neira Basso (Apr 22)
- Re: HTTP tunneling to bypass proxy filter p1g (Apr 23)
- Re: HTTP tunneling to bypass proxy filter Francisco Neira Basso (Apr 22)
- <Possible follow-ups>
- RE: HTTP tunneling to bypass proxy filter uglyhunK (Apr 22)
- Re: Re: HTTP tunneling to bypass proxy filter uglyhunK (Apr 24)
- Re: Re: HTTP tunneling to bypass proxy filter Albert R. Campa (Apr 29)
(Thread continues...)
- RE: HTTP tunneling to bypass proxy filter Brandon Louder (Apr 21)