Medium Severity
Affected system
Java
CVSS
4.7
Component
BC-WD-UR
Patch Day
2021-03
Released on
2021/03/09
SAP Note
2978151
Workaround
No
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Advisory

On 09.03.2021 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Java.

SAP Note 2978151 addresses "Reverse tabnabbing issue in Unified Rendering based frameworks in NetWeaver Application Server Java" to prevent reverse tabnabbing with a medium risk for exploitation.

A workaround does not exist, according to SAP Security Advisory team. It is advisable to implement the correction as part of maintenance, the team suggests.

Reverse tabnabbing is an attack where a page linked from the target page is able to rewrite that page, for example to replace it with a phishing site. The following figure shows a brief illustration:

Reverse Tabnabbing Overview
Source: OWASP.org

While the user was originally on the correct page there is a high risk they will not notice that it has been changed to a phishing site.

Risk specification

Applications based on SAP Unified Rendering allow an unauthenticated remote attacker to redirect users to a malicious site due to insufficient reverse tabnabbing URL validation.

Solution

This note is a technical prerequisite for other UI Frameworks, the final fix itself will be delivered with the UI-Frameworks. Note you must ensure to update the corresponding SCA provided by:
WebDynpro Java

  • Implement note 2976947 first and ensure to install the corresponding AJAX-RUNTIME.SCA provided by this note
HTMLB
  • Implement note 2977001 first and ensure to install framework.sca and framework-ext.sca provided by this note

Affected System

SAP Netweaver Application Server Java is part of the SAP NetWeaver Application Platform. It provides the complete infrastructure for deploying and running Java applications.

The advisory is valid for

 

 

Disclaimer

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