CVE-2020-6240 in NetWeaver AS ABAP
Summary
by MITRE
SAP NetWeaver AS ABAP (Web Dynpro ABAP), versions (SAP_UI 750, 752, 753, 754 and SAP_BASIS 700, 710, 730, 731, 804) allows an unauthenticated attacker to prevent legitimate users from accessing a service, either by crashing or flooding the service leading to Denial of Service
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Analysis
by VulDB Data Team • 10/16/2020
SAP NetWeaver AS ABAP represents a critical enterprise application platform that serves as the foundation for numerous business-critical processes across global organizations. The vulnerability identified as CVE-2020-6240 specifically targets the Web Dynpro ABAP component within this platform, affecting multiple version releases including SAP_UI 750, 752, 753, 754 and SAP_BASIS 700, 710, 730, 731, 804. This flaw manifests as a denial of service vulnerability that can be exploited by unauthenticated attackers, creating a significant security risk for enterprises relying on these systems. The vulnerability resides in the service handling mechanisms of the Web Dynpro ABAP framework, which is designed to provide user interface components and application development capabilities for SAP environments. The affected versions represent a substantial portion of the deployed SAP NetWeaver installations, making this vulnerability particularly concerning for enterprise security postures.
The technical flaw within the Web Dynpro ABAP component stems from inadequate input validation and resource management within the service processing logic. Attackers can exploit this vulnerability by crafting malicious requests that either cause the service to crash or flood the system with excessive requests, effectively consuming available resources and rendering legitimate users unable to access critical business services. The vulnerability operates at the application layer, specifically targeting the communication protocols and service handling mechanisms that govern how Web Dynpro applications process user requests. This type of flaw typically falls under CWE-400 which categorizes weaknesses related to resource management issues, particularly those involving uncontrolled resource consumption. The vulnerability demonstrates characteristics consistent with application-level denial of service attacks where the attacker does not require authentication credentials to exploit the flaw, making it particularly dangerous as it can be leveraged by anyone with network access to the affected system.
The operational impact of CVE-2020-6240 extends far beyond simple service disruption, affecting core business operations and potentially leading to significant financial and reputational damage. Organizations utilizing affected SAP NetWeaver versions may experience complete service outages during exploitation, preventing authorized users from accessing critical enterprise applications, transaction processing, and business-critical data. The vulnerability can be particularly devastating in mission-critical environments such as manufacturing, finance, or supply chain management systems where continuous availability is essential. Attackers can maintain prolonged denial of service conditions by repeatedly flooding the service with malicious requests, making the impact cumulative and potentially lasting for extended periods. The vulnerability also creates opportunities for attackers to use this as a stepping stone for further exploitation attempts, as demonstrated by ATT&CK technique T1499 which describes denial of service attacks as a precursor to more sophisticated attacks. Organizations may face regulatory compliance issues, SLA violations, and potential loss of customer confidence due to service interruptions caused by this vulnerability.
Mitigation strategies for CVE-2020-6240 require immediate action from organizations to protect their SAP environments from exploitation. The primary recommendation involves applying the relevant SAP security patches and updates released by SAP to address the specific resource management flaws in the Web Dynpro ABAP component. Organizations should also implement network-level controls including firewall rules, rate limiting, and access control lists to restrict access to affected services and detect anomalous traffic patterns. Additionally, implementing intrusion detection systems and monitoring solutions can help identify exploitation attempts and provide early warning of potential attacks. The vulnerability highlights the importance of maintaining up-to-date security patches and following SAP's recommended security practices. Organizations should conduct thorough vulnerability assessments to identify all affected systems and prioritize remediation efforts based on risk exposure and business criticality. Regular security monitoring and incident response procedures should be enhanced to address potential exploitation attempts, as this vulnerability could be used as part of broader attack campaigns targeting enterprise SAP infrastructure. The remediation process should also include comprehensive testing to ensure that patches do not introduce compatibility issues with existing business applications while maintaining the security posture of the overall SAP ecosystem.