Mask Your Web Server for Enhanced Security
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by Joe Lima
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Get Your Headers Straight
The number and sequence of your HTTP headers and the presence or absence of certain platform-specific headers provide handy ways for more sophisticated hackers to fingerprint your Web server. A relatively unexplored area of server profiling, this will become a more common exploit as administrators start to implement countermeasures against obvious HTTP vulnerabilities like the Server header. For IIS users, a custom ISAPI filter can alter the Microsoft-specific header order or sequence to emulate, say, a default Apache installation. Apache users can accomplish any header order emulation they wish by experimenting with the location and order of Header directives in mod_headers.

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