SAP takes the security of its vast product portfolio very seriously and thus releases security fixes for
vulnerabilities reported by external researchers and their customers every second Tuesday of the month.
SAP Note 2965315
was released on
13.10.2020 and deals with
"[CVE-2020-6365] Reverse Tabnabbing vulnerability in SAP NetWeaver AS Java Start Page" within Java.
We advice you to follow the instructions, to resolve
medium potential for exploitation
in component BC-JAS-ADM-ADM.
According to SAP Security Advisory team a workaround does not exist. It is advisable to implement the correction as monthly patch process.
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:
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 specificationThe SAP NetWeaver AS Java Start Page allows an unauthenticated remote attacker to redirect users to a malicious site due to insufficient reverse tabnabbing URL validation. 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 affected application no longer allows browser's child window to control the parent window object.
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 AS Java Home: SAP Netweaver Application Server Java wiki
- A dedicated SAP NetWeaver 7.40 Application Server for Java Security Guide exists.
The advisory is valid for
- J2EE-APPS 7.10-7.11
- J2EE-APPS 7.20
- J2EE-APPS 7.30
- J2EE-APPS 7.31
- J2EE-APPS 7.40
- J2EE-APPS 7.50