SAP security note 1741028, "Unauthorized modification of displayed content in JBM Web", is a note. Below are the symptom, SAP recommended solution and the affected software components.
Description
Symptom
JBM Web-bidding can be abused by an attacker, allowing them to modify displayed application content without authorization and potentially obtain authentication information from other legitimate users.
Solution
The string-based kiosk parameter was removed and changed to a CHAR1 internally. The parameter is now stored in a server-side cookie instead of being passed page to page.
In addition, all pages now encode with <%@page language="abap" forceEncode="html"%>.
Reason and prerequisites
Web bidding BSPs: /JBM/ACCEPT_BID and /JBM/ACCEPT_BID_RU within JBM do not sufficiently encode input and output parameters, 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
- JBM 700
Full note on SAP: SAP Support Launchpad note 1741028
Detailed exploitation and proof-of-concept material for this note is maintained in the RedRays Security Platform. For access, contact [email protected].
