CVE-2012-5048 in Optima PLC
Summary
by MITRE
APIFTP Server in Optimalog Optima PLC 1.5.2 and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted packet.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2012-5048 affects the APIFTP Server component within Optimalog Optima PLC version 1.5.2 and earlier releases. This represents a critical security flaw that exposes the system to remote exploitation, potentially leading to significant operational disruptions. The vulnerability resides in the server's handling of incoming network packets, specifically targeting the protocol implementation that governs file transfer operations. The affected system operates within industrial control environments where reliable network services are essential for maintaining operational continuity and data integrity.
The technical flaw manifests as a NULL pointer dereference condition that occurs when the APIFTP Server processes a specially crafted packet sent by an attacker. This particular vulnerability falls under the category of improper input validation and memory management errors, which are commonly classified as CWE-476 in the Common Weakness Enumeration system. When the server receives the malformed packet, it attempts to dereference a null pointer reference during the processing of the FTP protocol commands, resulting in an immediate crash of the daemon process. The vulnerability does not require authentication or special privileges to exploit, making it particularly dangerous in unsecured network environments where industrial systems may be exposed to external threats.
The operational impact of this vulnerability extends beyond simple service disruption, as it can lead to complete system unavailability within industrial control networks. When the daemon crashes, it creates a denial of service condition that can interrupt critical file transfer operations essential for industrial processes. The crash typically results in the immediate termination of the FTP service, requiring manual intervention to restart the affected component. In industrial environments where Optima PLC systems control manufacturing processes or critical infrastructure, such an outage can lead to production delays, data loss, or even safety hazards. The vulnerability represents a significant risk to operational technology environments where system uptime and reliability are paramount for maintaining production schedules and operational safety standards.
Mitigation strategies for this vulnerability require immediate action to update the affected Optima PLC software to version 1.5.3 or later, which includes patches addressing the NULL pointer dereference issue. Network segmentation and access control measures should be implemented to restrict unauthorized access to the FTP service, particularly in industrial environments where such systems may be exposed to external networks. Security monitoring should be enhanced to detect unusual network traffic patterns that might indicate exploitation attempts. Organizations should also implement network intrusion detection systems capable of identifying malformed FTP packets targeting this specific vulnerability. The ATT&CK framework categorizes this vulnerability under the T1499.004 technique for Network Denial of Service, highlighting the importance of implementing robust network security controls. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within industrial control systems, as this vulnerability demonstrates the risks associated with legacy software in critical infrastructure environments.