[CAL-2011-0071]Adobe Shockwave Player Parsing cupt atom heap overflow Feb 15 2012 01:01AM
Code Audit Labs (vulnhunt gmail com)
[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


adobe security bulletins

1 Affected Products
adobe shockwave
adobe Shockwave 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

.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
.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 loc_6809FCB0: ; CODE XREF:
.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;
*(_DWORD *)(v6 - 4) = IML32_1414_get_a_dword(v3);
v4 = IML32_1409();
v6 += 40;
while ( v2 < *(_DWORD *)(v5 + 0x1C) );

4 Exploitable?
Successfully exploited this vulnerability could lead to arbitrary code

5 Crash info:
eax=00000000 ebx=00002a63 ecx=07916058 edx=08980028 esi=07981008
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
*** ERROR: Module load completed but symbols could not be loaded for
C:\WINDOWS\system32\Adobe\Shockwave 11\DIRAPI.dll
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
09e9ef40 0755028c 07894154 08250bb0 07894154 DIRAPI+0x9fd5a
00000000 00000000 00000000 00000000 00000000 DIRAPI+0xa028cPOC

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