CVE-2024-6876 in Basic Library
Summary
by MITRE • 09/10/2024
Out-of-Bounds read vulnerability in OSCAT Basic Library allows an local, unprivileged attacker to access limited internal data of the PLC which may lead to a crash of the affected service.
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Analysis
by VulDB Data Team • 10/01/2024
The vulnerability identified as CVE-2024-6876 represents a critical out-of-bounds read flaw within the OSCAT Basic Library component of industrial control systems. This library serves as a foundational software element in programmable logic controllers and industrial automation environments where reliable operation is paramount. The flaw manifests as a memory access violation that occurs when the library processes certain input data sequences, specifically triggering unauthorized memory access patterns that extend beyond the allocated buffer boundaries. Such vulnerabilities are particularly dangerous in industrial control environments where system stability and safety are non-negotiable requirements.
The technical nature of this vulnerability stems from inadequate input validation and memory management within the OSCAT Basic Library implementation. When an unprivileged local attacker executes malicious input sequences or manipulates data structures processed by this library, the system attempts to read memory locations that fall outside the intended boundaries of allocated buffers. This condition creates a predictable access pattern that allows the attacker to potentially observe internal memory contents, including sensitive operational data, configuration parameters, or system state information that should remain protected. The vulnerability is classified as a CWE-129 weakness under the Common Weakness Enumeration framework, specifically representing an insufficient input validation issue that enables unauthorized memory access.
The operational impact of this vulnerability extends beyond simple data exposure to potentially compromise the stability and availability of industrial control systems. Local attackers with minimal privileges can exploit this flaw to access limited internal data of the programmable logic controller, which may include operational parameters, control logic states, or other sensitive information that could aid in more sophisticated attacks. More critically, the vulnerability can lead to service crashes or system instability, potentially causing operational disruptions in manufacturing processes, production lines, or critical infrastructure systems. The timing and nature of these crashes may be unpredictable, making system reliability and maintenance planning challenging for industrial operators who depend on continuous operation of their control systems.
Mitigation strategies for CVE-2024-6876 should prioritize immediate software updates from the vendor, as this vulnerability represents a clear indication of inadequate security practices in industrial software development. Organizations should implement network segmentation and access controls to limit local system access, particularly in industrial environments where physical security is crucial. The principle of least privilege should be enforced to ensure that only authorized personnel have access to system components that could be exploited through this vulnerability. Additionally, system monitoring should be enhanced to detect anomalous memory access patterns or service disruptions that could indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter usage, as exploitation may involve crafting specific input sequences that trigger the memory access violation. Regular security assessments and vulnerability scanning should be implemented to identify similar issues in industrial control system software libraries, as this represents a broader class of vulnerabilities that affect industrial automation environments.