Today Positive Technologies' expert Dmitry Sklyarov will explain how Intel ME 11.x stores its state on the flash and the other types of file systems that are supported by ME 11.x in London during his talk on Black Hat conference. Here is his articles about recovering Huffman tables in Intel ME 11.x
Many Intel ME 11.x modules are stored in Flash memory in compressed form [1]. Two different compression methods are used: LZMA and Huffman encoding [2]. LZMА can be decompressed using publicly available tools [3], but reversing Huffman encoding is a much more difficult challenge. Unpacking of Huffman encoding in ME is implemented in hardware, so writing the equivalent code in software is a far from trivial task—assuming it can be accomplished at all.
Many Intel ME 11.x modules are stored in Flash memory in compressed form [1]. Two different compression methods are used: LZMA and Huffman encoding [2]. LZMА can be decompressed using publicly available tools [3], but reversing Huffman encoding is a much more difficult challenge. Unpacking of Huffman encoding in ME is implemented in hardware, so writing the equivalent code in software is a far from trivial task—assuming it can be accomplished at all.
