When the PassThru command of ext.dll is invoked the BadBlue server
takes the rest of the URI received by the client and copies it in a
stack buffer of 4096 bytes using strcpy() and causing a buffer
overflow.
Using the upload feature is possible for an attacker to upload a
specific file outside the destination folder with also the possibility
of overwriting existent files, included ext.ini which contains all the
configuration of the server.
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