CVE-2018-2433 in Gateway
Summary
by MITRE
SAP Gateway (SAP KERNEL 32 NUC, SAP KERNEL 32 Unicode, SAP KERNEL 64 NUC, SAP KERNEL 64 Unicode 7.21, 7.21EXT, 7.22 and 7.22EXT; SAP KERNEL 7.21, 7.22, 7.45, 7.49 and 7.53) allows an attacker to prevent legitimate users from accessing a service, either by crashing or flooding the service.
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Analysis
by VulDB Data Team • 03/02/2020
SAP Gateway represents a critical component within the SAP ecosystem serving as the primary interface for external communication with SAP systems. This vulnerability affects multiple kernel versions including both 32-bit and 64-bit architectures with both NUC and Unicode variants, spanning from versions 7.21 through 7.53. The flaw manifests as a denial of service condition that can be exploited by malicious actors to disrupt legitimate business operations. The vulnerability stems from inadequate input validation mechanisms within the gateway's processing logic, allowing attackers to craft specially malformed requests that cause the system to either crash or become unresponsive. This affects the core functionality of SAP Gateway by undermining the availability of critical business services that organizations rely upon for their day-to-day operations.
The technical implementation of this vulnerability involves the exploitation of buffer handling and request processing routines within SAP Gateway's kernel components. Attackers can leverage this weakness by sending crafted payloads that trigger memory corruption or resource exhaustion conditions. The impact extends across multiple SAP kernel versions, indicating a fundamental flaw in the underlying architecture rather than a isolated incident. This vulnerability aligns with CWE-400 which categorizes weaknesses related to resource exhaustion and improper handling of input data. The attack vectors typically involve sending malformed HTTP requests or SOAP messages that cause the gateway to enter an unstable state. The service disruption can range from temporary unavailability to complete system crashes depending on the specific implementation and the nature of the crafted attack payload.
The operational impact of CVE-2018-2433 extends far beyond simple service disruption as it directly affects business continuity and operational efficiency within SAP environments. Organizations relying on SAP Gateway for mission-critical processes face potential revenue loss, customer service degradation, and compliance violations when these services become unavailable. The vulnerability creates opportunities for attackers to perform sustained denial of service attacks that can persist until system administrators implement mitigations or apply patches. From an attacker perspective, this vulnerability provides a low-effort, high-impact method for disrupting SAP operations, making it particularly attractive for malicious actors. The attack pattern follows typical denial of service methodologies outlined in the MITRE ATT&CK framework under the service disruption category, where adversaries target system availability to achieve their objectives.
Mitigation strategies for this vulnerability require immediate patching of affected SAP kernel versions to address the underlying buffer handling flaws. Organizations should implement network-level protections such as firewalls and intrusion detection systems to monitor and filter suspicious traffic patterns. Additionally, configuring rate limiting and connection pooling mechanisms can help reduce the impact of potential flooding attacks. SAP recommends applying the relevant security notes and patches issued for each affected kernel version, with particular attention to the specific version ranges mentioned in the vulnerability description. Network segmentation and monitoring solutions should be deployed to detect anomalous behavior patterns that may indicate exploitation attempts. The implementation of robust input validation controls and proper error handling within SAP Gateway configurations can provide additional layers of defense against similar vulnerabilities. Organizations should also conduct regular vulnerability assessments and penetration testing to identify and remediate similar weaknesses in their SAP infrastructure deployments.