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 2393937
was released on
12.11.2019 and deals with
"VMC Authority Check" within ABAP.
We advice you to follow the instructions, to resolve missing authorization check with a
high potential for exploitation
in component AP-PRC-PR.
According to SAP Security Advisory team a workaround exists. It is advisable to implement the correction as project***.
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.
SAP Internet Pricing and Configurator (IPC), Version AP 7.00 and higher does not perform necessary authorization checks for an authenticated user, resulting in escalation of privileges.
Additional checks on authorization object IPC are introduced via the Switchable Authorization Framework (SACF) when calling corresponding jRFC running inside VMC (Java inside ABAP machine). And the good news are: a workaround exists, too! This was suggested by the SAP security experts: "If not needed but accidentally turned on: Turn off VMC in transaction SM52 (potentially turn it off globally via profile parameter vmcj/enable=off, this is the default setting)."
The advisory 2393937 describes a problem within an ABAP based systems of a specific version. Affected versions are described below. ABAP software is deployed in various software components and is widely used within the SAP product portfolio.
SAP NetWeaver Application Server (formally known as SAP Web Application Server) is a building block of SAP NetWeaver. It is the foundation for most software products developed by SAP SE. SAP NetWeaver systems exist with Java and/or ABAP stacks. The advisory could be relevant for single and dual-stack ABAP installations.
The advisory is valid for
- SAP_AP 700
- SAP_AP 750
- SAPAPIPCJ 700
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.