Researchers Hack Web Application Firewalls
OWASP Europe presentation demonstrates tools that fingerprint the brand of WAF, as well as bypass it altogetherA pair of researchers at the OWASP Europe 2009 conference on Wednesday showed how some Web application firewalls (WAFs) are prone to attack.
Wendel Henrique, a member of SpiderLabs (Trustwave's advanced securityteam), and Sandro Gauci, founder and CSO for EnableSecurity, also foundsome WAFs vulnerable to the same types of exploits they are supposed toprotect Web apps from, such as cross-site scripting (XSS) attacks.
The researchers used a tool they developed, called WafW00f, todetect and fingerprint the presence -- and in some cases, the brand --of a WAF running in front of a Web application. A second tool createdby Henrique and Gauci, called WafFun, let them exploit and bypass WAFsrunning in blacklisting and whitelisting modes. With a combination ofWafW00f and WafFun, the researchers are able to execute attacks on theWAF invisibly so they can successfully hack the Web-facing applicationsitting behind it.
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"If an attacker knows what product and version, it's easy toexploit it. One of the things [WAF] vendors claim is that they[operate] in stealth [mode]," Henrique says. "But in practice, theyhave a lot of different behaviors that they create...and you can usethose behaviors to identify what WAF is in place."
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