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AirWatchMDMJailbreakBypass.txt
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AirWatchMDMJailbreakBypass.txt
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AirWatch MDM solution has "jailbreak" detection, the binary was decrypted and disassembled to
identify how the detection works. It was found this detection was shit (technical term) and
could be bypassed using the following exploits.
Rename /Applications/Cydia.app and /etc/apt or alternatively modify one byte of the string
in a decrypted binary and repack to run on a jailbroken device.
For lulz the vulnerable function is shown here.
-- prdelka (13/11/12)
__text:00062A14 ; =============== S U B R O U T I N E =======================================
__text:00062A14
__text:00062A14 ; Attributes: bp-based frame
__text:00062A14
__text:00062A14 sub_62A14 ; DATA XREF: -[AWCompromiseDetection detectCompromiseStatus]+9Ao
__text:00062A14 ; -[AWCompromiseDetection detectCompromiseStatus]+B6o
__text:00062A14
__text:00062A14 var_28 = -0x28
__text:00062A14 var_24 = -0x24
__text:00062A14 var_20 = -0x20
__text:00062A14 var_1C = -0x1C
__text:00062A14
__text:00062A14 PUSH {R4-R7,LR}
__text:00062A16 ADD R7, SP, #0xC
__text:00062A18 PUSH.W {R8,R10,R11}
__text:00062A1C SUB SP, SP, #0x10
__text:00062A1E MOV R10, R0
__text:00062A20 MOV R5, R2
__text:00062A22 UXTB R0, R1
__text:00062A24 CMP R0, #1
__text:00062A26 IT EQ
__text:00062A28 CMPEQ R5, #0
__text:00062A2A BNE.W loc_62B4C
__text:00062A2E MOV R1, (selRef_defaultManager - 0x62A42) ; selRef_defaultManager
__text:00062A36 MOV R0, (classRef_NSFileManager - 0x62A44) ; classRef_NSFileManager
__text:00062A3E ADD R1, PC ; selRef_defaultManager
__text:00062A40 ADD R0, PC ; classRef_NSFileManager
__text:00062A42 LDR R1, [R1] ; "defaultManager"
__text:00062A44 LDR R0, [R0] ; _OBJC_CLASS_$_NSFileManager
__text:00062A46 BLX _objc_msgSend
__text:00062A4A MOV R4, R0
__text:00062A4C MOV R0, (selRef_fileExistsAtPath_ - 0x62A5C) ; selRef_fileExistsAtPath_
__text:00062A54 MOVW R2, #0xC80E
__text:00062A58 ADD R0, PC ; selRef_fileExistsAtPath_
__text:00062A5A MOVT.W R2, #0x13
__text:00062A5E ADD R2, PC ; "/Applications/Cydia.app"
__text:00062A60 LDR R5, [R0] ; "fileExistsAtPath:"
__text:00062A62 MOV R0, R4
__text:00062A64 MOV R1, R5
__text:00062A66 BLX _objc_msgSend
__text:00062A6A STR R0, [SP,#0x28+var_1C]
__text:00062A6C MOVW R2, #0xC804
__text:00062A70 MOV R0, R4
__text:00062A72 MOVT.W R2, #0x13
__text:00062A76 MOV R1, R5
__text:00062A78 ADD R2, PC ; "/etc/apt/"
__text:00062A7A MOVS R4, #4
__text:00062A7C BLX _objc_msgSend
__text:00062A80 STR R0, [SP,#0x28+var_20]
__text:00062A82 MOVW R1, #0x487C
__text:00062A86 MOVS R3, #0
__text:00062A88 MOVT.W R1, #0x13
__text:00062A8C MOV R0, (cfstr_Test - 0x62AA4) ; "test"
__text:00062A94 MOVW R2, #0xC7E8
__text:00062A98 ADD R1, PC ; selRef_writeToFile_atomically_encoding_error_
__text:00062A9A MOVT.W R2, #0x13
__text:00062A9E STR R4, [SP,#0x28+var_28]
__text:00062AA0 ADD R0, PC ; "test"
__text:00062AA2 STR R3, [SP,#0x28+var_24]
__text:00062AA4 ADD R2, PC ; "/var/mobile/mobile.dat"
__text:00062AA6 LDR R1, [R1] ; "writeToFile:atomically:encoding:error:"
__text:00062AA8 MOVS R3, #0
__text:00062AAA BLX _objc_msgSend
__text:00062AAE MOV R11, R0
__text:00062AB0 BLX _fork
__text:00062AB4 MOV R6, R0
__text:00062AB6 CMP R6, #0
__text:00062AB8 BEQ.W loc_62CC8
__text:00062ABC MOV R1, (selRef_delegate - 0x62ACC) ; selRef_delegate
__text:00062AC4 LDR.W R0, [R10,#0x14]
__text:00062AC8 ADD R1, PC ; selRef_delegate
__text:00062ACA LDR.W R8, [R1] ; "delegate"
__text:00062ACE MOV R1, R8
__text:00062AD0 BLX _objc_msgSend
__text:00062AD4 MOV R1, (selRef_respondsToSelector_ - 0x62AE8) ; selRef_respondsToSelector_
__text:00062ADC MOV R2, (selRef_compromiseDetection_succeededWithResponse_ - 0x62AEA) ; selRef_compromiseDetection_succeededWithResponse_
__text:00062AE4 ADD R1, PC ; selRef_respondsToSelector_
__text:00062AE6 ADD R2, PC ; selRef_compromiseDetection_succeededWithResponse_
__text:00062AE8 LDR R1, [R1] ; "respondsToSelector:"
__text:00062AEA LDR R5, [R2] ; "compromiseDetection:succeededWithRespon"...
__text:00062AEC MOV R2, R5
__text:00062AEE BLX _objc_msgSend
__text:00062AF2 TST.W R0, #0xFF
__text:00062AF6 BEQ.W loc_62CC0
__text:00062AFA LDR.W R0, [R10,#0x14]
__text:00062AFE MOV R1, R8
__text:00062B00 BLX _objc_msgSend
__text:00062B04 MOVS R4, #0
__text:00062B06 MOVW R9, #0xF4B4
__text:00062B0A CMP R6, #1
__text:00062B0C MOVT.W R9, #0x13
__text:00062B10 MOV R1, (selRef_performSelector_withObject_ - 0x62B1E) ; selRef_performSelector_withObject_
__text:00062B18 ADD R9, PC ; "Not Compromised"
__text:00062B1A ADD R1, PC ; selRef_performSelector_withObject_
__text:00062B1C MOV.W R6, #0
__text:00062B20 IT LT
__text:00062B22 MOVLT R6, #1
__text:00062B24 LDR R2, [SP,#0x28+var_1C]
__text:00062B26 LDR R3, [SP,#0x28+var_20]
__text:00062B28 LDR R1, [R1] ; "performSelector:withObject:"
__text:00062B2A ORRS R2, R3
__text:00062B2C MOV R3, (cfstr_Compromised - 0x62B3C) ; "Compromised"
__text:00062B34 ORR.W R2, R2, R11
__text:00062B38 ADD R3, PC ; "Compromised"
__text:00062B3A TST.W R2, #0xFF
__text:00062B3E IT EQ
__text:00062B40 MOVEQ R4, #1
__text:00062B42 TST R4, R6
__text:00062B44 IT NE
__text:00062B46 MOVNE R3, R9
__text:00062B48 MOV R2, R5
__text:00062B4A B loc_62CBC