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29 November 2012


I agree that injecting XSS code into request headers such as User-Agent is not new. The purpose of this post is to highlight that attackers are still using it and that security vendors must take care to prevent this type of attack if viewing attack data in a web-based console (reference:

Preventing this type of attack is one reason why Trustwave's WebDefend WAF does not use a web-based admin console.

This is an ancient trick. People were abusing a lack of escaping in the access log viewer of Netscape Commerce Server back in 1995 to inject text to advertise various things to webmasters.

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