BadBlue web server versions 2.15 and below have a vulnerability that allows remote attackers to gain administrative control of a server. The ext.dll that allows pages parsing with the LoadPage command attempts to prevent remote users from accessing .hts pages by checking the 'referer' HTTP header of requests, and also verifying that all requests for .hts pages originate from 127.0.0.1 (the loopback). By appending certain illegal characters to the requested filename, it is possible to cause BadBlue to interpret .hts files from a remote system, thereby yielding administrative control of the server to the attacker.
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