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Segmentation Fault: SAK is 0x28 #72

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recolic opened this issue Jun 4, 2019 · 3 comments
Open

Segmentation Fault: SAK is 0x28 #72

recolic opened this issue Jun 4, 2019 · 3 comments

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@recolic
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recolic commented Jun 4, 2019

I run autoreconf --install ; ./configure ; make, then gdb src/mfcuk. then run -C -R 0:A. Then it booms.

I tried run -C -R -1, run -C -R 0, run -C -R 0 -s 250 -S 250. All of them booms at mfcuk.c:1512.

My mfcuk version: git-b333a7925a3be80d9496c88c9fef816777827a83

My libnfc version: libnfc 1.7.1+204+g4ae4cc8-1

Here's gdb logs:

mfcuk - 0.3.8
Mifare Classic DarkSide Key Recovery Tool - 0.3
by Andrei Costin, [email protected], https://andreicostin.com

WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_skgt.mfd'
WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_ratb.mfd'
WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_oyster.mfd'
[New Thread 0x7ffff78f8700 (LWP 14154)]

INFO: Connected to NFC reader: ACS ACR122U 00 00 / ACR122U215


VERIFY: 
	Key A sectors: 0
Thread 1 "mfcuk" received signal SIGSEGV, Segmentation fault.
0x00000000004089ec in main (argc=4, argv=0x7fffffffd518) at mfcuk.c:1512
1512	      for (j = 0; (j < crntNumVerifKeys) && (ptr_trailer->abtAccessBits[action_byte] & ACTIONS_VERIFY) && !(ptr_trailer->abtAccessBits[result_byte] & ACTIONS_VERIFY); j++) {
(gdb) info locals 
crntVerifKey = 0
action_byte = 0 '\000'
crntVerifTagType = 40 '('
crntNumVerifKeys = 1
mp = {mpa = {abtKey = "\000\000\000\000\000", abtAuthUid = "\000\000\000"}, mpd = {abtData = '\000' <repeats 15 times>}, mpv = {abtValue = "\000\000\000"}}
result_byte = 1 '\001'
ch = -1
strOutputFilename = '\000' <repeats 255 times>
keyOpt = "\000\000\000\000\000"
uidOpt = "\000\000\000"
ptr_trailer = 0x8000ffff9fb3
ptr_trailer_dump = 0x0
sector = 0
block = 4294967295
action = 2 '\002'
specific_key_type = 96 '`'
max_sectors = 40 '('
iSleepAtFieldOFF = 10
iSleepAfterFieldON = 50
token = 0x0
sep = 0x40b398 ":"
str = 0x0
iter = 2
context = 0x110f8e0
pnd = 0x1123cb0
ti = {nti = {nai = {abtAtqa = "\004", btSak = 40 '(', szUidLen = 4, abtUid = "\025\070#\350\000\000\000\000\000", szAtsLen = 0, abtAts = '\000' <repeats 253 times>}, nfi = {szLen = 69730308, btResCode = 0 '\000', abtId = "\000\000\025\070#\350\000", 
      abtPad = "\000\000\000\000\000\000\000", abtSysCode = "\000"}, nbi = {abtPupi = "\004\000(\004", abtApplicationData = "\000\000\000", abtProtocolInfo = "\000\000", ui8CardIdentifier = 21 '\025'}, nii = {abtDIV = "\004\000(\004", 
      btVerLog = 0 '\000', btConfig = 0 '\000', szAtrLen = 2537801479767457792, abtAtr = "\350", '\000' <repeats 31 times>}, nsi = {abtUID = "\004\000(\004\000\000\000"}, nci = {abtUID = "\004\000(\004", btProdCode = 0 '\000', btFabCode = 0 '\000'}, 
    nji = {btSensRes = "\004", btId = "(\004\000"}, nti = {szDataLen = 69730308, abtData = "\000\000\000\025\070#\350", '\000' <repeats 24 times>}, ndi = {abtNFCID3 = "\004\000(\004\000\000\000\000\000", btDID = 0 '\000', btBS = 21 '\025', 
      btBR = 56 '8', btTO = 35 '#', btPP = 232 '\350', abtGB = '\000' <repeats 47 times>, szGB = 0, ndm = NDM_UNDEFINED}}, nm = {nmt = NMT_ISO14443A, nbr = NBR_106}}
uiErrCode = 0
ui64KeyRecovered = 0
dump_loaded_tag = {uid = 0, type = 0 '\000', datetime = '\000' <repeats 13 times>, description = '\000' <repeats 127 times>, tag_basic = {amb = {{mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\000", 
          abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = '\000' <repeats 15 times>}, mbt = {abtKeyA = "\000\000\000\000\000", abtAccessBits = "\000\000\000", abtKeyB = "\000\000\000\000\000"}} <repeats 256 times>}}}
tag_on_reader = {uid = 356000744, type = 40 '(', datetime = '\000' <repeats 13 times>, description = '\000' <repeats 127 times>, tag_basic = {amb = {{mbm = {abtUID = "\025\070", <incomplete sequence \350>, btBCC = 0 '\000', btUnknown = 40 '(', 
          abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = "\025\070#\350\000(\000\000\000\000\000\000\000\000\000"}, mbt = {abtKeyA = "\025\070#\350\000(", abtAccessBits = "\000\000\000", 
          abtKeyB = "\000\000\000\000\000"}}, {mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = '\000' <repeats 15 times>}, mbt = {
          abtKeyA = "\000\000\000\000\000", abtAccessBits = "\000\000\000", abtKeyB = "\000\000\000\000\000"}} <repeats 255 times>}}}
tag_recover_verify = {uid = 356000744, type = 40 '(', datetime = '\000' <repeats 13 times>, description = '\000' <repeats 127 times>, tag_basic = {amb = {{mbm = {abtUID = "\025\070", <incomplete sequence \350>, btBCC = 0 '\000', btUnknown = 40 '(', 
          abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = "\025\070#\350\000(\000\000\000\000\000\000\000\000\000"}, mbt = {abtKeyA = "\025\070#\350\000(", abtAccessBits = "\000\000\000", 
          abtKeyB = "\000\000\000\000\000"}}, {mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = '\000' <repeats 15 times>}, mbt = {
          abtKeyA = "\000\000\000\000\000", abtAccessBits = "\000\000\000", abtKeyB = "\000\000\000\000\000"}}, {mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, 
        mbd = {abtData = '\000' <repeats 15 times>}, mbt = {abtKeyA = "\000\000\000\000\000", abtAccessBits = "\000\000\000", abtKeyB = "\000\000\000\000\000"}}, {mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\002", 
          abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = "\000\000\000\000\000\000\002\000\000\000\000\000\000\000\000"}, mbt = {abtKeyA = "\000\000\000\000\000", abtAccessBits = "\002\000\000", abtKeyB = "\000\000\000\000\000"}}, {
        mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = '\000' <repeats 15 times>}, mbt = {abtKeyA = "\000\000\000\000\000", 
          abtAccessBits = "\000\000\000", abtKeyB = "\000\000\000\000\000"}} <repeats 252 times>}}}
finger_tag = {amb = {{mbm = {abtUID = "\000\000\000", btBCC = 0 '\000', btUnknown = 0 '\000', abtATQA = "\000", abtUnknown = "\000\000\000\000\000\000\000"}, mbd = {abtData = '\000' <repeats 15 times>}, mbt = {abtKeyA = "\000\000\000\000\000", 
        abtAccessBits = "\000\000\000", abtKeyB = "\000\000\000\000\000"}} <repeats 256 times>}}
finger_score = 0
finger_score_highest = 0
finger_index_highest = 2
pm3_full_set_log = {0, 0, 0, 0, 0}
pm3_log_multisect_auth = 0
pm3_ks2 = 0
pm3_ks3 = 4294967295
pm3_revstate = 0x0
pm3_revstate_multisect_auth = 0x0
pm3_lfsr = 0
pm3_plfsr = 0x7fffffff8f08 ""
pm3_log_multisect_decrypted = "\000\000\000"
pm3_log_multisect_verified = "\000\000\000"
i = 0
j = 0
k = 96
st = 4203646
numDefKeys = 9
current_default_keys = 0x110f260
(gdb) print ptr_trailer->abtAccessBits[action_byte]
Cannot access memory at address 0x8000ffff9fb9
(gdb) print ptr_trailer->abtAccessBits[result_byte]
Cannot access memory at address 0x8000ffff9fba
(gdb) print ptr_trailer->abtAccessBits
Cannot access memory at address 0x8000ffff9fb9
(gdb) print ptr_trailer
$1 = (mifare_classic_block_trailer *) 0x8000ffff9fb3
(gdb) print ptr_trailer->abt
abtAccessBits  abtKeyA        abtKeyB        
(gdb) print ptr_trailer->abtKeyA
Cannot access memory at address 0x8000ffff9fb3
@recolic
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recolic commented Jun 5, 2019

Found the reason: The crntVerifTagType is 0x28, so it's not a valid IS_MIFARE_CLASSIC_1K or IS_MIFARE_CLASSIC_4K. Then get_trailer_block_for_sector returns 0xffffffff, then everything booms.

@recolic
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recolic commented Jun 5, 2019

gdb trace shows that tag_recover_verify.type is set at line 1467: tag_recover_verify.type = ti.nti.nai.btSak. (0x28)

@recolic recolic changed the title Segmentation Fault Segmentation Fault: tag_recover_verify.type is 0x28 Jun 5, 2019
@recolic recolic changed the title Segmentation Fault: tag_recover_verify.type is 0x28 Segmentation Fault: SAK is 0x28 Jun 5, 2019
@recolic
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recolic commented Jun 5, 2019 •
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