Unauthorized modification of BSP in Webdocuments, SAP security note 1676754

SAP security note 1676754, “Unauthorized modification of BSP in Webdocuments”, is a program error note released on 03.03.2016. Below are the symptom and SAP recommended solution.

Description

Symptom

This security note has been updated. For more detailed information, see Security Note 2071329.

The Webdocuments can be abused by malicious users allowing them to modify displayed application content without authorization, and to potentially obtain authentication information from other legitimate users.

Solution

Apply this note or import the changes via the relevant support package.

Reason and prerequisites

The Webdynpro class CL_DEF_IM_DPVMS_BADI_MODEL does not sufficiently encode OUTPUT parameters, resulting in a cross-site scripting (XSS) issue.

Cross-site scripting can be used to steal another user’s authentication information, such as data relating to their current session. A malicious user who gains access to this data may use it to impersonate the user and access all information with the same rights as the target user.

If an administrator is impersonated, the security of the application may be fully compromised.

References