150 Ways To Bypass Web Application Firewalls In One Tool


 

A tool for testing if Web application firewalls (WAFs) are vulnerable to around 150 protocol-level evasion techniques was released at the Black Hat USA 2012 security conference on Wednesday.

The tool and the research that went into its creation are the work of Ivan Ristic, director of engineering at security vendor Qualys and the original author of the popular ModSecurity Web application firewall.

Web application firewalls are designed to protect Web applications from known attacks, such as SQL injection attacks, that are commonly used to compromise websites. They do this by intercepting requests sent by clients and enforcing strict rules about their formatting and payload.

However, there are various methods for sneaking malicious requests that violate these rules past WAFs by modifying certain parts of their headers or the paths of requested URLs. These are known as protocol-level evasion techniques, and WAFs are not properly equipped to deal with them at the moment because the techniques are not very well documented, Ristic said.

The researcher tested the evasion techniques he found primarily against ModSecurity, an open source Web application firewall, but it’s reasonable to assume that other WAFs are vulnerable to some of them as well.

In fact, Ristic said he shared a few of the techniques with others during the research stage and that they had tested them successfully against some commercial WAF products.

Erwin Huber Dohner, head of research and development at Switzerland-based WAF vendor Ergon Informatik, confirmed after seeing Ristic’s presentation that the evasion methods are a problem for the industry.

Source: Tool released at Black Hat contains 150 ways to bypass Web application firewalls | Security – InfoWorld.

The question is will this public release of research kick-start a discussion as Mr. Ristic hopes?

 

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About brvanlanen

Just a thirty-something guy currently hanging it up in the greater Green Bay area. My post-high school educational background is mainly in the Information Technology field. Specifically I have an A.A.S. in Computer Network Systems and a B.S. in Information Systems Security, both from ITT Technical Institute, in addition to A and MCDST certifications. In my free time I enjoy spending time with my family, cooking and sports. My Christian faith is also important to me as a Missouri-Synod Lutheran and all my children attend a Lutheran grade school. When it comes to political leanings I am a conservative first and foremost which you will discover rather quickly. As for sports I am a huge fan of the Green Bay Packers.

Posted on July 30, 2012, in attacks, Cybersecurity, Security, Web and tagged , , , , , , . Bookmark the permalink. Comments Off on 150 Ways To Bypass Web Application Firewalls In One Tool.

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