鬼仔's Blog

by cocoruder([email protected])
http://ruder.cdut.net

Summary:

More than three local code execute vulnerabilities exist in Adobe Flash CS3 Professional while it is parsing FLA files. An attacker who successfully exploit these vulnerabilities can run arbitrary code on the affected system.

Affected Software Versions:

Adobe Flash CS3 Professional 9.0
Macromedia Flash MX 2004

Details:

All these vulnerabilities are due to the parser does not handle the malformed FLA file accurately, by changing value of some special addresses in normal FLA file, it can result in some unexpected errors at "call" instruction, the following is one of the situations:

eax=00000000 ebx=00000000 ecx=41414141 edx=00000000 esi=08feac38 edi=0012eb2c
eip=00943502 esp=0012e15c ebp=08feac3c iopl=0 nv up ei pl nz na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00250206
*** ERROR: Symbol file could not be found. Defaulted to export symbols for Flash-unprepped.exe –
Flash_unprepped!std::basic_istream >::basic_istream >+0x3d7762:
00943502 8b01 mov eax,dword ptr [ecx] ds:0023:41414141=????????, can be controlled
00943504 8b10 mov edx,dword ptr [eax]
00943506 6a01 push 1
00943508 ffd2 call edx ; code executing is possible
0094350a 8bbe48020000 mov edi,dword ptr [esi+248h]
00943510 3bfb cmp edi,ebx
00943512 899ef4010000 mov dword ptr [esi+1F4h],ebx
00943518 7410 je Flash_unprepped!std::basic_istream >::basic_istream >+0x3d778a (0094352a)

It is confirmed that at least one of them can be written successful working exploits for, on the other hand, because the FLA file can not be loaded remotely, which can reduce the threat of these vulnerabilities.

Vendor Response:

Adobe has replied me that they will fix these vulnerabilities in the next major release of Flash Professional, we suggest all of the Adobe Flash CS3 Professional users do not open the FLA file which are from distrustful source.

An advisory from the vendor can be found at:

http://www.adobe.com/support/security/advisories/apsa08-03.html

Fortinet advisory can be found at:

http://www.fortiguardcenter.com/advisory/FGA-2008-07.html

CVE Information:

CVE-2008-1201

Disclosure Timeline:

2007.11.09 Vendor notified via email
2007.11.10 Vendor responded
2007.11.16 Vendor replied they can not find a way to exploit
2007.11.16 Send some notes to the vendor
2007.11.27 Vendor replied they still can not find a way to exploit
2007.11.28 Send a working exploit to the vendor
2008.03.11 Vendor replied there will not be a plan for developing an update due to the threat of the vul, they will fix it via the next major release.
2008.03.20 Coordinated vulnerability disclosure

–EOF–