SAP NetWeaver Portal XMLValidationComponent XXE

2015.06.25
Risk: High
Local: No
Remote: Yes
CWE: CWE-611


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

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: http://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:http://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 http://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 Reuters, Yahoo, SC Magazine, The Register, CIO, PC World, DarkReading, 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 business-critical applications from both cyber attacks and internal fraud. Our clients are usually large enterprises, Fortune 2000 companies, and managed service providers whose requirements are to actively monitor and manage the security of vast SAP landscapes on a global scale. Our flagship product is ERPScan Security Monitoring Suite for SAP. This multi award-winning innovative software is the only solution on the market certified by SAP SE covering all tiers of SAP security: vulnerability assessment, source code review, and Segregation of Duties. The largest companies from diverse industries like oil and gas, banking, retail, even nuclear power installations as well as consulting companies have successfully deployed the software. ERPScan Security Monitoring Suite for SAP is specifically designed for enterprises to continuously monitor changes in multiple SAP systems. It generates and analyzes trends in user friendly dashboards, manages risks, tasks, and can export results to external systems. These features enable central management of SAP system security with minimal time and effort. We follow the sun and function in two hubs located in the Netherlands and the US to operate local offices and partner network spanning 20+ countries around the globe. This enables monitoring cyber threats in real time and providing agile customer support. Address USA: 228 Hamilton Avenue, Fl. 3, Palo Alto, CA, 94301 Phone: 650.798.5255 Twitter: @erpscan Scoop-it: Business Application Security http://erpscan.com

References:

http://erpscan.com/advisories/erpscan-15-004-sap-netweaver-portal-xmlvalidationcomponent-xxe/


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