SAP NetWeaver Portal 7.31 XXE Injection

Posted on Posted in Exploit

SAP NetWeaver Portal version 7.31 suffers from an XXE injection vulnerability. By default, the parser opens external entities referenced within an XML input, which can then lead to malicious content being parsed. This malicious content can reference internal resources, such as files. These internal resources can be disclosed in the response to the request, or can be used to perform a denial of service attack on the parsing system, rendering the application content temporarily unavailable.

Quelle: Packet Storm Security

ERPSCAN Research Advisory [ERPSCAN-15-006] SAP NetWeaver Portal 
ReportXmlViewer - XXE


Application:            SAP NetWeaver Portal 7.31
Versions Affected:        SAP NetWeaver Portal 7.31, probably others
Vendor URL:            http://SAP.com
Bugs:                XXE
Sent:                09.12.2014
Reported:            09.12.2014
Vendor response:                10.12.2014
Date of Public Advisory:        18.06.2015
Reference:            SAP Security Note 2111939
Author:                Vahagn Vardanyan (ERPScan)


Description


1. ADVISORY INFORMATION
Title: SAP NetWeaver Portal ReportXmlViewer - XXE
Advisory ID: [ERPSCAN-15-006]
Risk: High
Advisory URL: 
[ERPSCAN-15-006] SAP NetWeaver Portal ReportXmlViewer – XXE
Date published: 15.03.2015 Vendors contacted: SAP 2. VULNERABILITY INFORMATION Class: XXE [CWE-122] Impact: XML external entity, information disclosure, denial of service, role upload, thread reporting Remotely Exploitable: Yes Locally Exploitable: No CVE Name: CVE-2015-2811 3. VULNERABILITY DESCRIPTION By default, the parser opens external entities referenced within an XML input, which can then lead to malicious content being parsed. This malicious content can reference internal resources, such as files. These internal resources can be disclosed in the response to the request, or can be used to perform a denial of service attack on the parsing system, rendering the application content temporarily unavailable. 4. VULNERABLE PACKAGES SAP NetWeaver Portal 7.31 Other versions are probably affected too, but they were not checked. 5. SOLUTIONS AND WORKAROUNDS To correct this vulnerability, install SAP Security Note 2111939. 6. AUTHOR Vahagn Vardanyan (ERPScan) 7. TECHNICAL DESCRIPTION SAP XML parser validates all incoming XML requests with a user-specified DTD. 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
[ERPSCAN-15-006] SAP NetWeaver Portal ReportXmlViewer – XXE
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