[FD] [ERPSCAN-17-020] XXE VIA DOCTYPE in PeopleSoft PeopleSoftServiceListeningConnector

Application: Oracle PeopleSoft Versions Affected: PeopleSoft HCM 9.2 on PeopleTools 8.55 Vendor URL: http://oracle.com Bug: XXE Reported: 23.12.2016 Vendor response: 24.12.2016 Date of Public Advisory: 18.04.2017 Reference: Oracle CPU April 2017 Author: Nadya Krivdyuk (ERPScan) Description 1. ADVISORY INFORMATION Title:[ERPSCAN-17-020] XXE VIA DOCTYPE in PeopleSoft PeopleSoftServiceListeningConnector Advisory ID: [ERPSCAN-17-020] Risk: high CVE: CVE-2017-3548 Advisory URL: http://ift.tt/2p2c0oR Date published: 18.04.2017 Vendors contacted: Oracle 2. VULNERABILITY INFORMATION Class: XXE Impact: File disclosure, network discovery Remotely Exploitable: yes Locally Exploitable: no CVSS Information CVSS Base Score v3: 8.0 / 10 CVSS Base Vector: AV : Attack Vector (Related exploit range) Network (N) AC : Attack Complexity (Required attack complexity) High (H) PR : Privileges Required (Level of privileges needed to exploit) High (H) 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 High (H) I : Impact to Integrity High (H) A : Impact to Availability High (H) 3. VULNERABILITY DESCRIPTION A malicious user can modify an XML-based request to include XML content that is then parsed locally. 4. VULNERABLE PACKAGES PeopleSoft HCM 9.2 on PeopleTools 8.55 5. SOLUTIONS AND WORKAROUNDS To correct this vulnerability, implement Oracle CPU April 2017 6. AUTHOR Nadya Krivdyuk 7. TECHNICAL DESCRIPTION An attacker can use an XML external entity vulnerability to send specially crafted unauthorized XML requests, which will be processed by the XML parser. The attacker can use an XML external entity vulnerability for getting unauthorised access to the OS file system. PoC POST /PSIGW/PeopleSoftServiceListeningConnector HTTP/1.1 Host: 172.16.2.91:8000 Content-type: text/xml 8. ABOUT ERPScan Research ERPScan research team specializes in vulnerability research and analysis of critical enterprise applications. It was acknowledged multiple times by 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 of discovering new types of vulnerabilities (TOP 10 Web Hacking Techniques 2012) and of the "The Best Server-Side Bug" nomination at BlackHat 2013. ERPScan experts participated as speakers, presenters, and trainers at 60+ prime international security conferences in 25+ countries across the continents ( e.g. BlackHat, RSA, HITB) and conducted private trainings for several Fortune 2000 companies. ERPScan researchers carry out the EAS-SEC project that is focused on enterprise application security awareness by issuing annual SAP security researches. ERPScan experts were interviewed in specialized info-sec resources and featured in major media worldwide. Among them there are Reuters, Yahoo, SC Magazine, The Register, CIO, PC World, DarkReading, Heise, Chinabyte, etc. Our team consists of highly-qualified researchers, specialized in various fields of cybersecurity (from web application to ICS/SCADA systems), gathering their experience to conduct the best SAP security research. 9. ABOUT ERPScan ERPScan is the most respected and credible Business Application Cybersecurity provider. Founded in 2010, the company operates globally and enables large Oil and Gas, Financial, Retail and other 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 for CISO's to evaluate and secure SAP and Oracle ERP systems and business-critical applications from both cyberattacks and internal fraud. As a rule, our clients are large enterprises, Fortune 2000 companies and MSPs, whose requirements are to actively monitor and manage security of vast SAP and Oracle landscapes on a global scale. We ‘follow the sun’ and have two hubs, located in Palo Alto and Amsterdam, to provide threat intelligence services, continuous support and to operate local offices and partner network spanning 20+ countries around the globe. Address 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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