[CAL-2011-0071]Adobe Shockwave Player Parsing cupt atom heap overflow

Discover: instruder of code audit labs of vulnhunt.com
CAL: CAL-2011-0071
CVE: CVE-2012-0758

http://blog.vulnhunt.com/index.php/2012/02/15/cal-2011-0071_adobe-shockwave-player-parsing-cupt-atom-heap-overflow/

adobe security bulletins
http://www.adobe.com/support/security/bulletins/apsb12-02.html

1 Affected Products

adobe shockwave 11.6.3.633
adobe Shockwave 11.6.1.629 and prior

2 Vulnerability Details

When adobe shockwave player parsing a dir type file,
it takes a dword from the dir file,and then take some
Computing this computing will leding to Integer overflow,
allocate a small memory,this Cause a heap overflow.

3 Analysis

asm in dirapi.dll 11.6.1.629

text:6809FC7A push esi
text:6809FC7B push edi
text:6809FC7C push ebp
text:6809FC7D call IML32_1414_get_a_dword //get a
dword form dir file
text:6809FC82 mov esi, eax //if eax=66666680
some like this,after esi+esi4 Will cause a heap overflow
text:6809FC84 lea eax, [esi+esi4] // Integrated
overflow
text:6809FC87 push 1
text:6809FC89 lea ecx, ds:24h[eax*8]
text:6809FC90 push ecx
text:6809FC91 call IML32_1111 ;
text:6809FC96 push eax
text:6809FC97 mov [esp+14h+arg_4], eax
text:6809FC9B call IML32_1114 //allocate memory
text:6809FCA0 mov edi, eax
text:6809FCA2 test edi, edi
text:6809FCA4 jz short loc_6809FD03
text:6809FCA6 mov [edi+1Ch], esi
text:6809FCA9 test esi, esi
text:6809FCAB jbe short loc_6809FCCB
text:6809FCAD lea esi, [edi+28h]
text:6809FCB0
text:6809FCB0 loc_6809FCB0: ; CODE XREF:
sub_6809FC60+69j
text:6809FCB0 push ebp
text:6809FCB1 call IML32_1414_get_a_dword ////write
the dword to the heap
text:6809FCB6 push 20h
text:6809FCB8 push esi
text:6809FCB9 push ebp
text:6809FCBA mov [esi-4], eax
text:6809FCBD call IML32_1409
text:6809FCC2 inc ebx
text:6809FCC3 add esi, 28h ////heap buffer overflow
text:6809FCC6 cmp ebx, [edi+1Ch]
text:6809FCC9 jb short loc_6809FCB0 //Cycle

c code like

     v6 = v4 + 40;
     do
     {
       *(_DWORD *)(v6 - 4) = IML32_1414_get_a_dword(v3);
       v4 = IML32_1409();
       ++v2;
       v6 += 40;
     }
     while ( v2 < *(_DWORD *)(v5 + 0x1C) );

4 Exploitable?

Successfully exploited this vulnerability could lead to arbitrary code
execution.

5 Crash info:

eax=00000000 ebx=00002a63 ecx=07916058 edx=08980028 esi=07981008
edi=07917068
eip=0754fd5a esp=09e9ef28 ebp=08250bd8 iopl=0 nv up ei pl zr na
pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000
efl=00210246
*** ERROR: Module load completed but symbols could not be loaded for
C:\WINDOWS\system32\Adobe\Shockwave 11\DIRAPI.dll
DIRAPI+0x9fd5a:
0754fd5a 8946fc mov dword ptr [esi-4],eax
ds:0023:07981004=???0:028> 0:023> kb
ChildEBP RetAddr Args to Child
WARNING: Stack unwind information not available. Following frames may be
wrong.
09e9ef40 0755028c 07894154 08250bb0 07894154 DIRAPI+0x9fd5a
00000000 00000000 00000000 00000000 00000000 DIRAPI+0xa028cPOC

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