Advisory

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 with a 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 specification

An authenticated adversary may run Enterprise Java Beans (EJBs) remotely via deprecated JCo RFC Provider service and with administrative rights.

Solution

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.

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 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

Releated advisories

Disclaimer

SecurityBridge takes the security of SAP products very seriously. We very much encourage the responsible disclosure of security vulnerabilities. If you have detected a vulnerability concerning 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 SecurityBridge advisory are generated and continuously enriched by our Team at SecurityBridge and affiliated security consultants, partners, customers of the SecurityBridge Platform, SAP support, and advisory groups.

We do not disclose zero-day vulnerabilities unless a security patch has been made available to the public. 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, SecurityBridge only discloses issues where the fixing security note has been released. 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.

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Notifications

Affected system Java

CVSS 5.9

Component BC-MID-CON-JCO

Patch Day2019-11

Released on2019/11/12

SAP Note 2814357

Workaround No

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
Java

_CVSS
5.9

_Component
BC-MID-CON-JCO

_{Patch Day}
2019-11

_{Released
on}
2019/11/12

_{SAP Note}
2814357

_Workaround
No