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 3000306
was released on
12.01.2021 and deals with
"[CVE-2021-21446] Denial of service (DOS) in SAP NetWeaver AS ABAP and ABAP Platform" within ABAP.
We advice you to follow the instructions, to resolve
denial of service (dos)
high potential for exploitation
in component BC-ABA-LA.
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. Denial of Service (DoS) attacks that take a system offline may lead to significant cost for the company, studies quantify the costs in average between 4 and 5 millions dollars. Business continuity requires SAP systems staying online. The CVSS scores or vulnerability descriptions are not enough to represent how a simple bug can lead to a significant loss for companies.
Risk specificationThis note has been re-released with updated ‘Support Packages & Patches’ information. SAP NetWeaver AS ABAP and ABAP Platform allow an unauthenticated attacker to prevent legitimate users from accessing a service, either by crashing or flooding the service. When executing demo examples from the web version of the ABAP Keyword Documentation, users can lock themselves, which is experienced for these users as "service not available".
The parallel execution of demo examples from the web version of the ABAP Keyword Documentation is prohibited and a meaningful text is shown.
The advisory 3000306 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