[DSECRG-11-014] SAP GUI (sapgui) - DLL hijacking

[Alexandr Polyakov <alexandr.polyakov@xxxxxxx>]

[DSECRG-11-014] SAP GUI (sapgui) - DLL hijacking 

SAP Front End applications (SAPGui.exe) are vulnerable to DLL hijacking 
attacks. It makes possible to remote code execution 

Digital Security Research Group [DSecRG] Advisory DSecRG-11-014 (Internal 
DSecRG-00183)

Application:     SAP GUI
Versions Affected:       6.4 - 7.2
Vendor URL:      http://www.sap.com
Bugs:    DLL hijacking
Exploits:        YES
Reported:        24.08.2010
Vendor response:         26.08.2010
Date of Public Advisory:        09.03.2011
CVE-number: 
Author:  Alexey Sintsov, Alexandr Polyakov
Digital Security Research Group [DSecRG] (research [at] dsecrg [dot] com)

Description
***********
SAP Front End applications (SAPGui.exe) are vulnerable to DLL hijacking 
attacks. It makes possible to remote code execution.

Details
*******
Attacker can place shortcuts for SAP GUI (.sap) on his share directory. In the 
same directory he place DLL's with evil code.
Name of DLL will be MFC80RUS.DLL(for Russian systems) or MFC80LOC.DLL for 
SAPGui.exe. Than attacker get link to shortcut to a victim. When victim try to 
open shortcuts, SAP application try to load it DLL's from working dir that is 
attacker share directory. So attacker's DLL's will be loaded by victim and evil 
code from this libraries will be executed. It is because SAPGui.exe and 
BExAnalyzer.exe try to find the directory in work path before system 
directories.


References
**********
http://dsecrg.com/pages/vul/show.php?id=314
http://www.sdn.sap.com/irj/sdn/index?rid=/webcontent/uuid/c05604f6-4eb3-2d10-eea7-ceb666083a6a
https://service.sap.com/sap/support/notes/1511179

Fix Information
*************
Solution to this issue is given in the 1511179 security note.

About
*****
Digital Security: 
Is one of the leading IT security companies in CEMEA, providing information 
security consulting, audit and penetration testing services, ERP and SAP 
security assessment, certification for ISO/IEC 27001:2005 and PCI DSS and PA 
DSS standards.

Digital Security Research Group:
International subdivision of Digital Security company focused on research and 
software development for securing business-critical systems like: enterprise 
applications (ERP,CRM,SRM), technology systems (SCADA, Smart Grid) and banking 
software. DSecRG developed new product "ERPSCAN security suite for SAP" and 
service "ERPSCAN Online" which can help customers to perform automated security 
assessments and compliance checks for SAP solutions.

Contact: research [at] dsecrg [dot] com
http://www.dsecrg.com
http://www.erpscan.com







Polyakov Alexandr. PCI QSA,PA-QSA
CTO Digital Security
Head of DSecRG
______________________
DIGITAL SECURITY
phone:  +7 812 703 1547
        +7 812 430 9130
e-mail: a.polyakov@xxxxxxx  

www.dsec.ru
www.dsecrg.com www.dsecrg.ru
www.erpscan.com www.erpscan.ru
www.pcidssru.com www.pcidss.ru


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