Home / vulnerabilities SAP NetWeaver AS Java XXE Injection
Posted on 19 August 2015
Source : packetstormsecurity.org Link
ERPSCAN Research Advisory [ERPSCAN-15-013] SAP NetWeaver AS Java CIM
UPLOAD – XXE
Application: SAP NetWeaver AS Java
Versions Affected: SAP NetWeaver AS Java 7.4, probably others
Vendor URL: http://SAP.com
Bugs: XML External Entity
Sent: 16.06.2014
Reported: 17.06.2014
Vendor response: 17.06.2014
Date of Public Advisory: 17.08.2015
Reference: SAP Security Note 2090851
Author: Vahagn Vardanyan (ERPScan)
Description
1. ADVISORY INFORMATION
Title: SAP NetWeaver AS Java 7.4
Advisory ID: [ERPSCAN-15-013]
Risk: High
Advisory URL: http://erpscan.com/advisories/erpscan-15-013-sap-netweaver-as-java-cim-upload-xxe
Date published: 18.05.2015
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-2015-4091
3. VULNERABILITY DESCRIPTION
1) An attacker can read an arbitrary file on the server by sending a
correct XML request with a crafted DTD to /sap.com/tc~sld~wd~main/Main
and reading the answer from the service.
2) The attacker can perform a DoS attack (for example, an XML Entity
Expansion attack).
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 2090851
6. AUTHOR
Vahagn Vardanyan (ERPScan)
7. TECHNICAL DESCRIPTION
SAP XML parser (/sap.com/tc~sld~wd~main/Main) validates all incoming
XML requests with a user-specified DTD.
8. REPORT TIMELINE
Sent: 16.06.2014
Reported: 17.06.2014
Vendor response: 17.06.2014
Date of Public Advisory: 18.05.2015
9. REFERENCES
http://erpscan.com/advisories/erpscan-15-013-sap-netweaver-as-java-cim-upload-xxe
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
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