CVE-2022-43509 in CX-Programmer
Summary
by MITRE • 12/07/2022
Out-of-bounds write vulnerability exists in CX-Programmer v.9.77 and earlier, which may lead to information disclosure and/or arbitrary code execution by having a user to open a specially crafted CXP file.
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Analysis
by VulDB Data Team • 04/24/2025
The vulnerability identified as CVE-2022-43509 represents a critical out-of-bounds write flaw within CX-Programmer version 9.77 and earlier, a widely used programming environment for Allen Bradley programmable logic controllers. This software serves as the primary interface for configuring and programming industrial control systems, making it a prime target for sophisticated cyber attacks. The vulnerability specifically manifests when the application processes a maliciously crafted CXP file format, which is the native file format used by CX-Programmer for storing project data and configuration information.
The technical nature of this vulnerability stems from inadequate input validation and memory management within the CX-Programmer application. When processing a specially crafted CXP file, the software fails to properly validate the size and structure of data elements, leading to a situation where write operations occur beyond the allocated memory boundaries. This out-of-bounds write condition creates a memory corruption scenario that can be exploited by attackers to execute arbitrary code with the privileges of the victim user. The flaw operates at the application level within the file parsing subsystem, making it particularly dangerous as it requires no special privileges beyond normal user access to trigger the vulnerability.
The operational impact of this vulnerability extends far beyond simple code execution, as it can potentially lead to complete system compromise within industrial environments. In the context of industrial control systems, where CX-Programmer is extensively used for programming PLCs and other critical infrastructure components, successful exploitation could result in unauthorized access to production processes, data exfiltration, and potential disruption of critical operations. The vulnerability's ability to cause information disclosure adds another layer of risk, as attackers could potentially extract sensitive configuration data, control logic, or proprietary industrial processes. According to CWE classification, this vulnerability maps to CWE-787: Out-of-bounds Write, which is categorized under the weakness type of Buffer Overflow. The ATT&CK framework would classify this as part of the T1203: Exploitation for Client Execution technique, where attackers leverage software vulnerabilities to execute malicious code on target systems.
Mitigation strategies for CVE-2022-43509 should prioritize immediate software updates from the vendor, as version 9.78 and later releases contain patches addressing this specific vulnerability. Organizations should implement strict file access controls, ensuring that only trusted sources can provide CXP files to systems running CX-Programmer. Network segmentation and access controls should be reinforced to limit exposure, particularly in operational technology environments. Security monitoring should include detection of unusual file processing activities and potential exploitation attempts. Additionally, regular security assessments of industrial control system environments should be conducted to identify similar vulnerabilities in other legacy software components. The vulnerability highlights the importance of maintaining up-to-date industrial control system software and implementing robust security practices in operational technology environments where these systems operate.