Application: SAP CRM Versions Affected: SAP CRM 7.02 EHP 2 Vendor URL: http://www.sap.com Bugs: XXE Exploits: YES Reported: 09.07.2013 Vendor response: 10.07.2013 Date of Public Advisory: 16.11.2013 Reference: SAP Security Note 1909665 Authors: Alexey Tyurin, Nikolay Mescherin (ERPScan)
SAP XML parser (/sap/crm/crm_flex_data) validates all incoming XML requests with user specified DTD.
It is possible for attackers to send any packets to any port of any system including localhost. It means that it is possible, for example, to send any administrative command to Gateway or Message server because the source of the packet will be localhost, and there is no restrictions for localhost. Another example is an attack on other interfaces.