High Severity
Affected system
ABAP
CVSS
7.5
Component
BC-ABA-LA
Patch Day
2021-01
Released on
2021/01/12
SAP Note
3000306
Workaround
No
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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 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) with a 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 specification

This 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".

Solution

The parallel execution of demo examples from the web version of the ABAP Keyword Documentation is prohibited and a meaningful text is shown.

Affected System

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

 

 

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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