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[ERPSCAN-15-004] SAP NetWeaver Portal XMLValidationComponent - XXE

ERPSCAN Research Advisory [ERPSCAN-15-004] SAP NetWeaver Portal XMLValidationComponent - XXE

Application:            SAP NetWeaver Portal 7.31
Versions Affected:        SAP NetWeaver Portal 7.31, probably others
Vendor URL:            http://SAP.com
Bugs:                XML eXternal Entity
Sent:                06.11.2014
Reported:            06.11.2014
Vendor response:                07.11.2014
Date of Public Advisory:        18.06.2015
Reference:            SAP Security Note 2098608
Author:                Vahagn Vardanyan (ERPScan)


Title: SAP NetWeaver Portal 7.31
Advisory ID: [ERPSCAN-15-004]
Risk: High
Advisory URL: http://erpscan.com/advisories/erpscan-15-004-sap-netweaver-portal-xmlvalidationcomponent-xxe/
Date published: 15.02.2015
Vendors contacted: SAP

Class: XML External Entity [CWE-611]
Impact: read file, upload file, DoS, information disclosure
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2015-2812

The problem is caused by a program error in 'ValidationComponent' due to the incorrect use of an XML parser. 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.

SAP NetWeaver Portal 7.31
Other versions are probably affected too, but they were not checked.

To correct this vulnerability, install SAP Security Notes 2098608 and 2093966.

Vahagn Vardanyan (ERPScan)

SAP XML parser (parserXMLValidationComponent) validates all incoming XML requests with a user-specified DTD.

Sent:                06.11.2014
Reported:                       06.11.2014
Vendor response:                07.11.2014
Date of Public Advisory:        18.06.2015


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