CVE-2020-9761 in ASYCUDA World
Summary
by MITRE
An issue was discovered in UNCTAD ASYCUDA World 2001 through 2020. The Java RMI Server has an Insecure Default Configuration, leading to Java Code Execution from a remote URL because an RMI Distributed Garbage Collector method is called.
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Analysis
by VulDB Data Team • 04/09/2024
The vulnerability identified as CVE-2020-9761 affects UNCTAD ASYCUDA World versions 2001 through 2020, representing a critical security flaw in the Java Remote Method Invocation (RMI) server implementation. This issue stems from an insecure default configuration that exposes the system to remote code execution risks, making it particularly dangerous for organizations relying on this customs and trade management software. The vulnerability specifically targets the RMI distributed garbage collector method, which when improperly configured creates an attack surface that malicious actors can exploit to execute arbitrary Java code from remote locations.
The technical flaw manifests through the improper handling of RMI server configurations where default settings fail to adequately secure the distributed garbage collection mechanism. When the RMI server initializes with these insecure defaults, it allows remote attackers to leverage the distributed garbage collector's functionality to load and execute malicious Java classes from remote URLs. This occurs because the system does not properly validate or restrict the sources from which RMI objects can be loaded, creating an environment where attacker-controlled code can be seamlessly integrated into the running Java Virtual Machine. The vulnerability is particularly concerning as it operates at the core of Java's distributed computing capabilities, exploiting fundamental aspects of RMI architecture that are designed to facilitate legitimate remote operations but become dangerous when misconfigured.
The operational impact of CVE-2020-9761 extends beyond simple code execution to potentially compromise entire organizational systems that rely on ASYCUDA World for customs processing and trade documentation. Attackers exploiting this vulnerability can gain unauthorized access to sensitive trade data, manipulate customs records, and potentially establish persistent backdoors within the system. The remote nature of the exploit means that attackers do not need physical access to the system, allowing for widespread compromise from anywhere on the network. Organizations using this software may face regulatory violations, financial losses, and reputational damage if their systems are compromised, particularly given the sensitive nature of customs and trade data handled by ASYCUDA World applications. The vulnerability also aligns with ATT&CK technique T1059.007 for Java, which specifically addresses remote code execution through Java-based systems, and maps to CWE-284 which covers improper access control in distributed systems.
Mitigation strategies for CVE-2020-9761 should focus on immediate configuration hardening of the RMI server components within ASYCUDA World installations. Organizations must ensure that RMI servers are configured with proper access controls, disabling unnecessary RMI features, and implementing strict network segmentation to limit exposure. The recommended approach includes configuring RMI to use secure communication protocols, disabling the distributed garbage collector when not required, and implementing proper firewall rules to restrict RMI traffic to trusted networks only. Additionally, system administrators should regularly audit RMI configurations and implement monitoring solutions to detect unauthorized RMI connections or suspicious code loading activities. Organizations should also consider implementing network-based intrusion detection systems to monitor for RMI-related traffic patterns that might indicate exploitation attempts. The vulnerability highlights the importance of following security best practices for Java applications and emphasizes the need for regular security assessments of enterprise systems that utilize distributed computing frameworks. This issue underscores the critical importance of proper software configuration management and the potential consequences of default settings that prioritize convenience over security in enterprise applications.