mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-12 04:26:41 +08:00
133 lines
5.9 KiB
Markdown
133 lines
5.9 KiB
Markdown
|
mf_nonce_brute
|
||
|
|
==============
|
||
|
|
|
||
|
|
Nested authentificated sector key recovery tool
|
||
|
|
-----------------------------------------------
|
||
|
|
|
||
|
|
Compatible tags:
|
||
|
|
* Mifare Classic 1k (4k)
|
||
|
|
* Mifare Plus in SL1 mode
|
||
|
|
|
||
|
|
To recover keys to nested authentificated sectors you need a reader-card communication log. To get it use
|
||
|
|
hardware tools that able to sniff communication (for example Proxmark3 or HydraNFC).
|
||
|
|
|
||
|
|
This enhanced version:
|
||
|
|
First 2 bytes should be bruteforced in phase 2 with mf_key_brute tool that interacts with a card.
|
||
|
|
|
||
|
|
Sample trace:
|
||
|
|
```
|
||
|
|
93 70 fd ac f6 d8 7f 21 4f // select card with UID fdacf6d8
|
||
|
|
TAG 08 b6 dd // sak
|
||
|
|
60 04 d1 3d // wanna auth block 0x04 with A key
|
||
|
|
TAG ed 12 9c 74 // 1st auth clear text nt
|
||
|
|
55 53 9f cc 41 8d e8 f3 // nr', ar' (nr^ks1, ar^ks2 )
|
||
|
|
TAG 05 49 e1 65 // at' ( at^ks3 )
|
||
|
|
03 24 26 56 // wanna read block 0x04
|
||
|
|
TAG ac 69 ef 58 45 e1 c2 1d a9 47 a5 94 54 ef 5d c7 1e a9 // block 0x04 content
|
||
|
|
d4 3e a8 aa
|
||
|
|
TAG 8e 8e e3 e6 e9 e2 5f dd f6 08 ce fb 02 6a db 75 94 2f
|
||
|
|
79 77 68 3c
|
||
|
|
TAG e0 00 00 80 80 08 cc 80 08 9c 82 e0 68 64 60 30 91 60 // 18 bytes = 16 byte content + 2 bytes crc
|
||
|
|
ea 88 c3 c2 // 4 byte read cmd
|
||
|
|
TAG a3 76 dc df c1 42 e0 ee c6 75 a4 ca eb 0c da eb 46 a0 // 18 bytes = 16 byte content + 2 bytes crc ks8 + crc
|
||
|
|
2d 27 ab 6f // wanna auth to 0x04 block with key B
|
||
|
|
|
||
|
|
-------Until this line we can recover key or decrypt communication with no troubles (see mfkey64 tool)--------------------------------
|
||
|
|
|
||
|
|
TAG 52 6e af 8b // nested auth encrypted tag nonce that we dont know
|
||
|
|
8e 21 3a 29 a4 80 7e 02 // nr_enc = nr^ks1, ar_enc = ar^ks2
|
||
|
|
TAG b9 43 74 8d // at_enc = at^ks3
|
||
|
|
e2 25 f8 32 // probably next command (actually is read block cmd, but we dont know it yet)
|
||
|
|
TAG 1f 26 82 8d 12 21 dd 42 c2 84 3e d0 26 7f 6b 2a 81 a9 // probably data
|
||
|
|
ba 85 1d 36 // probably read cmd
|
||
|
|
TAG 62 a8 78 69 ee 36 22 16 1c ff 4b 4e 69 cb 27 c2 e8 7e // probably data
|
||
|
|
a7 b1 c8 da // probably read cmd
|
||
|
|
TAG b2 fc 6c 65 60 ec 35 83 87 56 e3 7e 3c bf 38 b8 73 21 // probably data
|
||
|
|
99 92 13 55 // probably read cmd
|
||
|
|
TAG 93 5b 65 a3 1d 8c 75 b8 3a 63 e2 31 f0 d0 a9 24 9a f6 // probably data
|
||
|
|
```
|
||
|
|
|
||
|
|
|
||
|
|
Phase 1
|
||
|
|
-------
|
||
|
|
|
||
|
|
Syntax:
|
||
|
|
`mf_nonce_brute <uid> <{nt}> <nt_par_err> <{nr}> <{ar}> <ar_par_err> <{at}> <at_par_err> [<{next_command}>]`
|
||
|
|
|
||
|
|
Example: if `nt` in trace is `8c! 42 e6! 4e!`, then `nt` is `8c42e64e` and `nt_par_err` is `1011`
|
||
|
|
|
||
|
|
Example with parity (from this trace http://www.proxmark.org/forum/viewtopic.php?pid=550#p550) :
|
||
|
|
|
||
|
|
```
|
||
|
|
+ 561882: 1 : 26
|
||
|
|
+ 64: 2 : TAG 04 00
|
||
|
|
+ 10217: 2 : 93 20
|
||
|
|
+ 64: 5 : TAG 9c 59 9b 32 6c UID
|
||
|
|
+ 12313: 9 : 93 70 9c 59 9b 32 6c 6b 30
|
||
|
|
+ 64: 3 : TAG 08 b6 dd
|
||
|
|
+ 923318: 4 : 60 00 f5 7b AUTH Block 0
|
||
|
|
+ 112: 4 : TAG 82 a4 16 6c Nonce Tag (NT)
|
||
|
|
+ 6985: 8 : a1 e4! 58 ce! 6e ea! 41 e0! NR , AR
|
||
|
|
+ 64: 4 : TAG 5c! ad f4 39! AT
|
||
|
|
+ 811513: 4 : 8e 0e! 5d! b9 AUTH Block 0 (nested)
|
||
|
|
+ 112: 4 : TAG 5a! 92 0d! 85! Nonce Tag (NT)
|
||
|
|
+ 6946: 8 : 98! d7 6b! 77 d6 c6 e8 70 NR , AR
|
||
|
|
+ 64: 4 : TAG ca 7e! 0b! 63! AT
|
||
|
|
+ 670868: 4 : 3e! 70 9c! 8a
|
||
|
|
+ 112: 4 : TAG 36! 41 24! 79
|
||
|
|
+ 9505: 8 : 1b! 8c 3a! 48! 83 5a 4a! 27
|
||
|
|
+ 64: 4 : TAG 40! 6a! 99! 4b
|
||
|
|
+ 905612: 4 : c9 7c 64! 13! !crc
|
||
|
|
+ 112: 4 : TAG b5! ab! 1d! 2b
|
||
|
|
+ 6936: 8 : 7e! d2 5c! ca! 4b! 50! 88! c4 !crc
|
||
|
|
+ 64: 4 : TAG bf dd 01 be!
|
||
|
|
+ 987853: 4 : 56 98 49 d6! !crc
|
||
|
|
```
|
||
|
|
=>
|
||
|
|
```
|
||
|
|
./mf_nonce_brute 9c599b32 82a4166c 0000 a1e458ce 6eea41e0 0101 5cadf439 1001 3e709c8a
|
||
|
|
| | | | | | | | |
|
||
|
|
+UID +nt_enc | +nr_enc +ar_enc | +at_enc | +encrypted next cmd
|
||
|
|
+nt_par_err +at_par_err +at_par_err
|
||
|
|
```
|
||
|
|
|
||
|
|
These two taken from above use the plaintext tagnonce `nt`=`82a4166c`, they still find a possible key candidate.
|
||
|
|
```
|
||
|
|
./mf_nonce_brute 9c599b32 82a4166c 0000 a1e458ce 6eea41e0 0101 5cadf439 1001
|
||
|
|
./mf_nonce_brute 9c599b32 82a4166c 0000 98d76b77 d6c6e870 0000 ca7e0b63 0111
|
||
|
|
```
|
||
|
|
|
||
|
|
This one uses the encrypted tagnonce `nt`=`5a920d85`, it finds a valid key.
|
||
|
|
```
|
||
|
|
./mf_nonce_brute 9c599b32 5a920d85 1011 98d76b77 d6c6e870 0000 ca7e0b63 0111
|
||
|
|
```
|
||
|
|
|
||
|
|
This one uses the encrypted tagnonce `nt`=`5a920d85` and the encrypted cmd `3e709c8a` to validate , it finds a valid key.
|
||
|
|
```
|
||
|
|
./mf_nonce_brute 9c599b32 5a920d85 1011 98d76b77 d6c6e870 0000 ca7e0b63 0111 3e709c8a
|
||
|
|
```
|
||
|
|
Full output:
|
||
|
|
```
|
||
|
|
$ ./mf_nonce_brute 9c599b32 5a920d85 1011 98d76b77 d6c6e870 0000 ca7e0b63 0111 3e709c8a
|
||
|
|
Mifare classic nested auth key recovery. Phase 1.
|
||
|
|
-------------------------------------------------
|
||
|
|
uid: 9c599b32
|
||
|
|
nt encrypted: 5a920d85
|
||
|
|
nt parity err: 1011
|
||
|
|
nr encrypted: 98d76b77
|
||
|
|
ar encrypted: d6c6e870
|
||
|
|
ar parity err: 0000
|
||
|
|
at encrypted: ca7e0b63
|
||
|
|
at parity err: 0111
|
||
|
|
next cmd enc: 3e709c8a
|
||
|
|
|
||
|
|
|
||
|
|
Starting 4 threads to bruteforce encrypted tag nonce last bytes
|
||
|
|
CMD enc(3e709c8a)
|
||
|
|
dec(6000f57b) <-- Valid cmd
|
||
|
|
|
||
|
|
Valid Key found: [ffffffffffff]
|
||
|
|
|
||
|
|
Time in mf_nonce_brute (Phase 1): 1763 ticks 2.0 seconds
|
||
|
|
```
|