CVE-2008-2639 in CitectSCADA
Summary
by MITRE
Stack-based buffer overflow in the ODBC server service in Citect CitectSCADA 6 and 7, and CitectFacilities 7, allows remote attackers to execute arbitrary code via a long string in the second application packet in a TCP session on port 20222.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 03/20/2025
The vulnerability identified as CVE-2008-2639 represents a critical stack-based buffer overflow affecting Citect SCADA and CitectFacilities software versions 6 and 7, along with CitectFacilities 7. This flaw exists within the ODBC server service component that handles communication over TCP port 20222, creating a significant attack surface for remote code execution. The vulnerability specifically manifests when processing the second application packet within a TCP session, making it particularly insidious as it requires minimal initial interaction to establish the conditions for exploitation. The buffer overflow occurs due to insufficient input validation and bounds checking in the handling of user-supplied data, allowing attackers to overwrite adjacent memory locations on the stack. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite stack data. The attack vector requires only network connectivity to the targeted system, making it highly accessible to remote adversaries.
The technical exploitation of this vulnerability involves crafting a malicious TCP packet containing an excessively long string that exceeds the allocated buffer size within the ODBC server service. When the service processes this second application packet, the unchecked string input causes the stack to overflow, potentially allowing an attacker to overwrite return addresses and execute arbitrary code with the privileges of the affected service. The vulnerability's impact is amplified by the fact that it operates at the protocol level, requiring no local access or authentication to exploit. The affected systems typically run with elevated privileges due to their role in industrial control systems, making successful exploitation particularly dangerous. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 for command and script interpreter, where adversaries leverage buffer overflow vulnerabilities to gain code execution capabilities. The exploitation process typically involves careful crafting of the payload to ensure proper stack manipulation and code execution without triggering immediate system detection mechanisms.
The operational impact of CVE-2008-2639 extends beyond simple code execution to potentially compromise entire industrial control systems that rely on Citect SCADA and CitectFacilities platforms. These systems are commonly deployed in critical infrastructure environments such as power generation, water treatment facilities, and manufacturing plants where unauthorized access could lead to operational disruptions, safety hazards, or even physical damage. The vulnerability's remote exploitability means that attackers can target these systems from anywhere on the network, potentially compromising entire industrial networks through a single successful attack. Organizations using these legacy systems face significant challenges as the software platforms are often outdated and may no longer receive security updates, leaving them vulnerable to exploitation. The attack surface is particularly concerning given that many industrial environments have limited network segmentation, allowing attackers to move laterally once initial access is achieved. The vulnerability also impacts the integrity and availability of critical processes, as successful exploitation could allow attackers to modify control parameters or disrupt system operations. The lack of proper input validation and memory management in the ODBC service component creates a persistent threat that can be exploited repeatedly, making continuous monitoring and mitigation essential for organizations maintaining these legacy systems.
Mitigation strategies for CVE-2008-2639 should prioritize immediate network-level protections through firewall rules that restrict access to TCP port 20222 from untrusted networks. Organizations should implement network segmentation to isolate critical SCADA systems from general network access, reducing the attack surface available to potential adversaries. The most effective long-term solution involves upgrading to supported versions of Citect software that address this vulnerability, though this may require significant planning and testing due to the critical nature of industrial control systems. Additional protective measures include implementing intrusion detection systems that monitor for unusual TCP traffic patterns on port 20222, conducting regular security assessments of industrial control environments, and establishing robust network monitoring protocols. System administrators should also consider disabling the ODBC server service if it is not essential for operations, as this eliminates the attack vector entirely. The vulnerability highlights the importance of maintaining current security practices for legacy industrial systems and demonstrates why organizations must balance operational requirements with security considerations when managing critical infrastructure software. Regular security audits and vulnerability assessments should be conducted to identify similar issues in other legacy systems, as many industrial control platforms contain similar memory management flaws that could be exploited in similar fashion.