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Decoding seems to take place in the exact same buffer ! Return address HTTP encoded Return address selection ! Several address selection strategies tested ! Last address obtained (about 50% success) ! Randomly selected address (about 50%-60% success) ! Highest memory location (about 0%-10% success) ! Lowest memory location (about 90% success) ! Most frequently seen address (about 30%-40% success) Researching binary IOS ! Cisco supports serial gdb ! ROM Monitor (rommon) allows limited debugging !

Decoding seems to take place in the exact same buffer ! Return address HTTP encoded Return address selection ! Several address selection strategies tested ! Last address obtained (about 50% success) ! Randomly selected address (about 50%-60% success) ! Highest memory location (about 0%-10% success) ! Lowest memory location (about 90% success) ! Most frequently seen address (about 30%-40% success) Researching binary IOS ! Cisco supports serial gdb ! ROM Monitor (rommon) allows limited debugging !

Ability to fill multiple memory areas with our binary data (Ring buffer) ! HTTP Overflow ! Direct frame pointer and return address overwrite What we can do now ! Send full binary shell code ! Calculate the address of the code using IO memory block header information ! Select the shell code that is most likely not modified ! Directly redirect execution in the provided shell code ! Own the box Combining 1. Send the maximum URL length allowed by IOS 2. Send 2GB of additional URL elements in correct sized chunks 3.

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