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



[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+esi*4 Will cause a heap overflow .text:6809FC84 lea eax, [esi+esi*4] // 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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=====================
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