Unauthorized use of application functions in CRM-MD-BP-PCU, SAP security note 1599075

SAP security note 1599075, "Unauthorized use of application functions in CRM-MD-BP-PCU", is a note. Below are the symptom and SAP recommended solution.

Description

Symptom

A malicious user can trigger functionality in CRM-MD-BP-PCU without authentication and authorization.

Solution

For the stateless BSP application: CRM_PRN_ACC_OV

• Refer to Note 1520324 and Note 1551982 for additional information and instructions. The corrections from these notes are prerequisites for implementing this note.
• Implement the correction instructions of this note. This will also create the report BSP_XSRF_PARAM_CRM_MD_BP_PCU.
• Execute the report BSP_XSRF_PARAM_CRM_MD_BP_PCU and specify a corresponding transport request number when prompted. This report will activate XSRF protection for the BSP applications adapted by this note.

Reason and prerequisites

CRM-MD-BP-PCU executes certain functions by referencing specific URLs. When a malicious user tricks an authenticated user’s browser into making a request containing a certain URL and specific parameters, the function is executed with the rights of the authenticated user. The malicious user may use a cross-site scripting attack to do this, or they may present a link to the victim.