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 2814357
was released on
12.11.2019 and deals with
"[CVE-2019-0389] Privilege escalation in SAP NetWeaver Application Server Java" within Java.
We advice you to follow the instructions, to resolve
missing authorization check
medium potential for exploitation
in component BC-MID-CON-JCO.
According to SAP Security Advisory team a workaround does not exist. It is advisable to implement the correction as part of maintenance.
Missing authority checks are still the most common security defect related to authorizations in custom code. Since SAP uses an explicit authorization model, an authority checks must be coded in order to be executed. If an explicit check is not coded, all users have access. This type of vulnerability not only exists in SAP standard it also exists in customer coding. Check your custom developments for vulnerabilities that pose a risk to your systems. SecurityBridge helps detect code vulnerabilities before they are implemented in production.
Risk specificationAn authenticated adversary may run Enterprise Java Beans (EJBs) remotely via deprecated JCo RFC Provider service and with administrative rights.
All Enterprise Java Beans (EJBs), which are remotely called via the deprecated JCo RFC Provider service, will now be executed in an anonymous application thread context unless a user logon at the Java application server instance would be performed explicitly, i.e., the called EJBs will be executed by default with guest user permissions only.
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-FRMW 7.10-7.11
- J2EE-FRMW 7.20
- J2EE-FRMW 7.30
- J2EE-FRMW 7.31
- J2EE-FRMW 7.40
- J2EE-FRMW 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.