Advisory
On 11.04.2023 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within ABAP.
SAP Note 3296378 addresses "[CVE-2023-28763] - Denial of Service in SAP NetWeaver AS for ABAP and ABAP Platform" to prevent denial of service (dos) with a medium risk for exploitation.
A workaround does not exist, according to SAP Security Advisory team. It is advisable to implement the correction as monthly patch process, the team suggests.
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
SAP NetWeaver AS for ABAP and ABAP Platform allows an authenticated attacker to craft a request which can consume the resources of a server to render it unavailable, resulting in a denial of service vulnerability.Solution
The vulnerable code has been commented out and can no longer be executed
Affected System
The advisory 3296378 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
- 9.8 Multiple vulnerabilities associated with Reprise License Manager 14.2 component used with SAP 3D Visual Enterprise License Manager
- 7.8 [CVE-2023-33990] Denial of service (DOS) vulnerability in SAP SQL Anywhere
- 7.7 [CVE-2023-35871] Memory Corruption vulnerability in SAP Web Dispatcher
- 7.5 Denial of service (DOS) in SAP Commerce
- 7.5 [CVE-2020-6186] Denial of Service (DOS) Vulnerability in SAP Host Agent
