SAP security note 1937544, “Unauthorized modification of displayed content in User Self Service”. Below are the symptom, SAP recommended solution and the affected software components.
Description
Symptom
User Self Service can be abused by an attacker, allowing them to modify displayed application content without authorization, and to potentially obtain authentication information from other legitimate users.
Solution
Implement this note. After implementation, only the following characters are allowed in the user name: alphabets, numbers, dot (.), underscore (_), @.
Reason and prerequisites
The OData service USERREQUESTMANAGEMENT does not sufficiently restrict malicious entries in user names, resulting in a reflected cross-site scripting issue. A reflected XSS attack can be used to non-permanently deface or modify displayed content from a website.
Reflected XSS can be used to steal another user’s authentication information, such as data relating to their current session. An attacker 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.
Affected components
- IW_BEP: Version 200
- SAP_GWFND: Version 740
Full note on SAP: SAP Support Launchpad note 1937544
Detailed exploitation and proof-of-concept material for this note is maintained in the RedRays Security Platform. For access, contact [email protected].