Application: SAP NetWeaver AS JAVA Versions Affected: SAP NetWeaver AS JAVA 7.1 - 7.5 Vendor URL: http://SAP.com Bug: Directory traversal Sent: 29.09.2015 Reported: 29.09.2015 Vendor response: 30.09.2015 Date of Public Advisory: 08.03.2016 Reference: SAP Security Note 2234971 Author: Vahagn Vardanyan (ERPScan) Description 1. ADVISORY INFORMATION Title: [ERPSCAN-16-012] SAP NetWeaver AS Java directory traversal vulnerability Advisory ID: [ERPSCAN-16-012] Risk: medium Advisory URL: https://erpscan.com/advisories/erpscan-16-012/ Date published: 08.03.2016 Vendors contacted: SAP 2. VULNERABILITY INFORMATION Class: directory traversal Impact: remotely read file from server Remotely Exploitable: Yes Locally Exploitable: No CVE-2016-3976 CVSS Information CVSS Base Score v3: 7.5 / 10 CVSS Base Vector: AV : Attack Vector (Related exploit range) Network (N) AC : Attack Complexity (Required attack complexity) Low (L) PR : Privileges Required (Level of privileges needed to exploit) None (N) UI : User Interaction (Required user participation) None (N) S : Scope (Change in scope due to impact caused to components beyond the vulnerable component) Changed (C) C : Impact to Confidentiality Low (L) I : Impact to Integrity None (N) A : Impact to Availability None (N) 3. VULNERABILITY DESCRIPTION An authorized attacker can use a special request to read files from the server and then escalate his or her privileges. 4. VULNERABLE PACKAGES SAP NetWeaver AS JAVA 7.1 - 7.5 Other versions are probably affected too, but they were not checked. 5. SOLUTIONS AND WORKAROUNDS To correct this vulnerability, install SAP Security Note 2234971 6. AUTHOR Vahagn Vardanyan (ERPScan) 7. TECHNICAL DESCRIPTION An attacker can use an SAP NetWeaver function CrashFileDownloadServlet to read files from the server. PoC GET /XXX/CrashFileDownloadServlet?fileName=..\security\data\SecStore.key Disclaimer: According to the partnership agreement between ERPScan and SAP, our company is not entitled to publish any detailed information about detected vulnerabilities before SAP releases a patch. After the release, SAP suggests respecting an implementation time of three months and asks security researchers to not to reveal any details during this time. However, In this case, the vulnerability allows an attacker to read arbitrary files on a remote server, possibly disclosing confidential information, and many such services are exposed to the Internet. As responsible security researchers, ERPScan team made a decision not to disseminate the full PoC even after the specified time. 8. REPORT TIMELINE Send: 29.09.2015 Reported: 29.09.2015 Vendor response: 30.09.2015 Date of Public Advisory: 08.03.2016 9. REFERENCES https://erpscan.com/advisories/erpscan-16-012/ 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.