ERPSCAN Research Advisory [ERPSCAN-15-004] SAP NetWeaver Portal 
XMLValidationComponent - XXE


Application:            SAP NetWeaver Portal 7.31
Versions Affected:        SAP NetWeaver Portal 7.31, probably others
Vendor URL:            https://SAP.com
Bugs:                XML eXternal Entity
Sent:                06.11.2014
Reported:            06.11.2014
Vendor response:                07.11.2014
Date of Public Advisory:        18.06.2015
Reference:            SAP Security Note 2098608
Author:                Vahagn Vardanyan (ERPScan)


Description


1. ADVISORY INFORMATION
Title: SAP NetWeaver Portal 7.31
Advisory ID: [ERPSCAN-15-004]
Risk: High
Advisory URL: 
https://erpscan.com/advisories/erpscan-15-004-sap-netweaver-portal-xmlvalidationcomponent-xxe/
Date published: 15.02.2015
Vendors contacted: SAP


2. VULNERABILITY INFORMATION
Class: XML External Entity [CWE-611]
Impact: read file, upload file, DoS, information disclosure
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2015-2812


3. VULNERABILITY DESCRIPTION
The problem is caused by a program error in 'ValidationComponent' due to 
the incorrect use of an XML parser.
By default, the parser opens external entities referenced within an XML 
input, which can then lead to malicious content being parsed.
This malicious content can reference internal resources, such as files.
These internal resources can be disclosed in the response to the 
request, or can be used to perform a denial of service attack on the 
parsing system, rendering the application content temporarily unavailable.


4. VULNERABLE PACKAGES
SAP NetWeaver Portal 7.31
Other versions are probably affected too, but they were not checked.


5. SOLUTIONS AND WORKAROUNDS
To correct this vulnerability, install SAP Security Notes 2098608 and 
2093966.


6. AUTHOR
Vahagn Vardanyan (ERPScan)


7. TECHNICAL DESCRIPTION
SAP XML parser (parserXMLValidationComponent) validates all incoming XML 
requests with a user-specified DTD.


8. REPORT TIMELINE
Sent:                06.11.2014
Reported:                       06.11.2014
Vendor response:                07.11.2014
Date of Public Advisory:        18.06.2015


9. REFERENCES
https://erpscan.com/advisories/erpscan-15-004-sap-netweaver-portal-xmlvalidationcomponent-xxe/


10. ABOUT ERPScan Research
The company’s expertise is based on the research subdivision of ERPScan, 
which is engaged in vulnerability research and analysis of critical 
enterprise applications. It has achieved multiple acknowledgments from 
the largest software vendors like SAP, Oracle, Microsoft, IBM, VMware, 
HP for discovering more than 400 vulnerabilities in their solutions (200 
of them just in SAP!).
ERPScan researchers are proud to have exposed new types of 
vulnerabilities (TOP 10 Web Hacking Techniques 2012) and to be nominated 
for the best server-side vulnerability at BlackHat 2013.
ERPScan experts have been invited to speak, present, and train at 60+ 
prime international security conferences in 25+ countries across the 
continents. These include BlackHat, RSA, HITB, and private SAP trainings 
in several Fortune 2000 companies.
ERPScan researchers lead the project EAS-SEC, which is focused on 
enterprise application security research and awareness. They have 
published 3 exhaustive annual award-winning surveys about SAP security.
ERPScan experts have been interviewed by leading media resources and 
featured in specialized info-sec publications worldwide. These include 
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Heise, and Chinabyte, to name a few.
We have highly qualified experts in staff with experience in many 
different fields of security, from web applications and mobile/embedded 
to reverse engineering and ICS/SCADA systems, accumulating their 
experience to conduct the best SAP security research.


11. ABOUT ERPScan
ERPScan is one of the most respected and credible Business Application 
Security providers. Founded in 2010, the company operates globally. 
Named an Emerging vendor in Security by CRN and distinguished by more 
than 25 other awards, ERPScan is the leading SAP SE partner in 
discovering and resolving security vulnerabilities. ERPScan consultants 
work with SAP SE in Walldorf to improve the security of their latest 
solutions.
ERPScan’s primary mission is to close the gap between technical and 
business security. We provide solutions to secure ERP systems and 
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Our flagship product is ERPScan Security Monitoring Suite for SAP. This 
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