The advisory for Java adresses a "[CVE-2020-6202] Missing XML Validation in SAP NetWeaver Application Server Java (User Management Engine)". SAP Note 2847787 was released on 10.03.2020 and should be implemented during part of maintenance. The implementation demands a downtime. Component BC-JAS-SEC-UME has a medium risk of exploitation, according to the manufacturers security and response team.
Following the SAP Security Advisory team, a workaround does exist.
The User Management Engine (UME) does not sufficiently validate the LDAP datasource configuration XML document accepted from an untrusted source.
The corrective measure provided with this note ensures the LDAP datasource configuration XML document is properly validated. And the good news are: a workaround exists, too! This was suggested by the SAP security experts: "Filter engine on IDS/IPS/firewall systems screening for bogus external entity requests."
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
- SERVERCORE 7.10 4
- SERVERCORE 7.11
- SERVERCORE 7.20
- SERVERCORE 7.30
- SERVERCORE 7.31
- SERVERCORE 7.40
- SERVERCORE 7.50
ABEX takes the security of SAP products very seriously. We very much encourage the responsible disclosure of security vulnerabilities. If you have detected a vulnerability in one of the SAP software products – either in the latest or in a former product version follow the guidelines and processes in accordance with the SAP portal page “Report a Security Vulnerability to SAP”.
The advisories found within the ABEX security advisory are generated and continuously enriched by ABEX and affiliated security consultants, partners, customers of the SecurityBridge security suite, SAP support, and advisory groups.
There is no disclosure of zero-day vulnerabilities. In such case, the platform only provides details on which version or signature updates are available within the SecurityBridge platform in order to monitor or measure the vulnerability
In accordance with SAP guidelines, ABEX only discloses issues where the fixing security note has been released at least three months ago. The vulnerability platform makes no references to available exploits or Proof of Concepts (PoC). Advisories and vulnerabilities will always mention the fixing security note or hints to the corresponding SAP documentation.