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Posted in Security Hacks, Software Hacks Tagged Ghidra, router hacking Post navigation From this point dropping in one’s own configuration files should be no problem after encrypting them to make the firmware happy. Inside was a reference to the global key string, which when tossed into OpenSSL and after some fiddling turned out to decrypt the XML configuration file in des-ecdb mode. Searching for this filename string in the rest of the extracted files led to /lib/libcmm.so.ĭropping this shared library file into Ghidra to disassemble its code, found a function suspiciously called decryptFile. As the owner of the hardware, this was of course unacceptable and thus got a firmware image from the TP-Link site to see what could be gleaned from it in terms of encryption keys and other hints.Īfter obtaining the TP-Link-provided BIN file, the application of binwalk helpfully extracted the files embedded in it, followed by John the ripper decrypting the passwords in the /etc/passwd.bak file, and ultimately finding the encrypted /etc/default_config.xml file. Naturally this can all be done when staying inside the vendor-provided marked lines, which in this case meant ignoring the encrypted configuration files. This was the experience had when he got a TP-Link TL-MR3020 V3 for a mere 18 British Pounds, intending to use this 4G-capable router to increase internet reliability. Who doesn’t know the struggle? Buying an interesting piece of hardware for a song and a dance, and then finding that the device’s firmware and/or configuration file is locked down with various encryption or obfuscation methods.