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 2983367
was released on
08.12.2020 and deals with
"[CVE-2020-26838] Code Injection vulnerability in SAP Business Warehouse (Master Data Management) and SAP BW4HANA" within ABAP.
We advice you to follow the instructions, to resolve
code injection
with a
hot news potential for exploitation
in component BW-WHM-DBA-MD.
According to SAP Security Advisory team a workaround does not exist. It is advisable to implement the correction as monthly patch process .
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
The SAP BW Master Data Management and SAP BW4HANA provide attackers with high privileges the ability to submit a crafted request to generate and execute code without requiring any user interaction.Solution
For release 7.30 the affected function module has been equipped with a hard-coded report name which is used by the only legitimated caller. Starting with release 7.40 in SAP BW/4HANA the function should not be used anymore and thus has been disabled, meaning the code was removed
Affected System
The advisory 2983367 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
- DW4CORE 100
- DW4CORE 200
- SAP_BW 700-702 2
- SAP_BW 730 2
- SAP_BW 731 3
- SAP_BW 740 3
- SAP_BW 750-755 4
- SAP_BW 782 2
Disclaimer
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.
