[ERPSCAN-15-009] SAP Afaria 7 XcListener - Missing authorization check

ERPSCAN Research Advisory [ERPSCAN-15-009] SAP Afaria 7 XcListener - Missing authorization check

Application: SAP Afaria 7
Versions Affected: SAP Afaria 7, probably others
Vendor URL: http://SAP.com
Bugs: Missing authorization check
Sent: 09.12.2014
Reported: 09.12.2014
Vendor response: 10.12.2014
Date of Public Advisory: 18.06.2015
Reference: SAP Security Note 2134905
Author: Vahagn Vardanyan (ERPScan)

Description

1. ADVISORY INFORMATION
   Title: SAP Afaria 7 XcListener - Missing authorization check
   Advisory ID: [ERPSCAN-15-009]
   Risk: High
   Advisory URL: http://erpscan.com/advisories/erpscan-15-009-sap-afaria-7-xclistener-missing-authorization-check/
   Date published: 15.03.2015
   Vendors contacted: SAP

2. VULNERABILITY INFORMATION
   Class: DoS [CWE-862]
   Impact: DoS
   Remotely Exploitable: Yes
   Locally Exploitable: No
   CVE Name: CVE-2015-2816

3. VULNERABILITY DESCRIPTION
   An attacker can use a missing authorization check to access the service without any authorization procedures and use service functionality that has restricted access. This can lead to information disclosure, privilege escalation, and other attacks.

4. VULNERABLE PACKAGES
   SAP Afaria 7
   Other versions are probably affected too, but they were not checked.

5. SOLUTIONS AND WORKAROUNDS
   A vulnerability has been discovered in certain landscape configurations of SAP Afaria that utilize XcListener for initiating client-to-server communications. SAP has released security patches for the vulnerable clients, Windows Mobile, Windows CE, and Windows. Windows Phone is not affected. SAP strongly recommends that customers patch their servers.
   To be vulnerable, XcListener must be an active process. The Windows client enrollment policy allows administrators to enable/disable XcListener with the advanced option “Outbound listener and firewall”. XCListener listens to the port 3005. If the port 3005 is not exposed externally, then the vulnerability is only accessible locally on the machine.

Patching instructions:
1) Download hotfix
- SAP Afaria 7 SP5 Hotfix 8
- SAP Afaria 7 SP4 Hotfix 16
2) Apply server hotfix
The server version of XcListener will be patched when the hotfix is applied. The clients will be updated through the Afaria ESD process as they connect to the server.

6. AUTHOR
   Vahagn Vardanyan (ERPScan)

7. TECHNICAL DESCRIPTION
   An anonymous attacker can use a special request to crash the Sybase SQL Anywhere process on the server.

8. REPORT TIMELINE
   Sent: 09.12.2014
   Reported: 09.12.2014
   Vendor response: 10.12.2014
   Date of Public Advisory: 18.06.2015

9. REFERENCES
   http://erpscan.com/advisories/erpscan-15-009-sap-afaria-7-xclistener-missing-authorization-check/

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.
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