CVE-2023-41375 in PLC Programming Software
Summary
by MITRE • 09/20/2023
Use after free vulnerability exists in Kostac PLC Programming Software Version 1.6.11.0. Arbitrary code may be executed by having a user open a specially crafted project file which was saved using Kostac PLC Programming Software Version 1.6.9.0 and earlier because the issue exists in parsing of KPP project files. The vendor states that Kostac PLC Programming Software Version 1.6.10.0 or later implements the function which prevents a project file alteration. Therefore, to mitigate the impact of these vulnerabilities, a project file which was saved using Kostac PLC Programming Software Version 1.6.9.0 and earlier needs to be saved again using Kostac PLC Programming Software Version 1.6.10.0 or later.
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Analysis
by VulDB Data Team • 10/13/2023
The CVE-2023-41375 vulnerability represents a critical use-after-free flaw in Kostac PLC Programming Software version 1.6.11.0 that enables arbitrary code execution through malicious project file manipulation. This vulnerability specifically affects the parsing mechanism of KPP project files, creating a dangerous condition where memory previously allocated to program variables is accessed after being freed, potentially leading to memory corruption and unauthorized code execution. The flaw originates from earlier versions of the software, particularly those 1.6.9.0 and earlier, where project files could be crafted to exploit this memory management issue. The vulnerability operates through a classic buffer over-read scenario where the software fails to properly validate or sanitize project file content during parsing operations, allowing attackers to craft malicious KPP files that trigger the use-after-free condition when opened by the vulnerable software.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-416, which describes the use of freed memory condition. When a user opens a specially crafted project file, the software's parser processes the malicious content and attempts to access memory locations that were previously deallocated, creating opportunities for attackers to inject and execute arbitrary code with the privileges of the affected user. The attack vector is particularly concerning because it relies on social engineering through file manipulation rather than network-based exploitation, making it difficult to detect and prevent through traditional network security measures. This vulnerability demonstrates a failure in proper memory management practices and input validation, where the software does not adequately verify the integrity of project files before attempting to parse and execute their contents.
The operational impact of this vulnerability extends beyond simple code execution to potentially compromise entire industrial control systems that rely on Kostac PLC Programming Software for configuration and programming tasks. In industrial environments where PLCs control critical infrastructure, the ability to execute arbitrary code through project file manipulation could lead to unauthorized system modifications, process disruptions, or even physical damage to equipment. The vulnerability affects the software's integrity by allowing attackers to bypass normal execution controls and potentially gain persistent access to the system. Organizations using older versions of the software face significant risk as the malicious project files can be distributed through legitimate channels, making detection challenging. The vulnerability also impacts software supply chain security, as compromised project files could be used to target multiple installations simultaneously, creating widespread potential for system compromise.
The vendor has addressed this vulnerability in version 1.6.10.0 and later releases through enhanced project file parsing mechanisms and integrity validation functions. The recommended mitigation strategy involves re-saving any project files created with versions 1.6.9.0 or earlier using the patched software version, which essentially creates new clean copies that do not contain the exploitable memory corruption conditions. This remediation approach follows the ATT&CK technique of software supply chain compromise prevention by ensuring that previously vulnerable files are not reused in potentially compromised environments. Organizations should implement immediate patch management procedures to upgrade to version 1.6.10.0 or later, while also establishing file integrity monitoring processes to prevent the use of vulnerable project files. Additionally, security awareness training should emphasize the importance of only opening project files from trusted sources and implementing proper file validation procedures before opening any potentially compromised files in industrial programming environments. The vulnerability underscores the critical need for regular software updates and proper vulnerability management in industrial control systems, where the stakes of security breaches can be significantly higher than in typical enterprise environments.