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Implementing a Custom X86 Encoder
This paper describes the process of implementing a custom encoder for the x86 architecture. To help set the stage, the McAfee Subscription Manager ActiveX control vulnerability, which was discovered by eEye, will be used as an example of a vulnerability that requires the implementation of a custom encoder. In particular, this vulnerability does not permit the use of uppercase characters. To help make things more interesting, the encoder described in this paper will also avoid all characters above 0x7f. This will make the encoder both UTF-8 safe and tolower safe.
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