CVE-2023-41374 in PLC Programming Software
Summary
by MITRE • 09/20/2023
Double free issue exists in Kostac PLC Programming Software Version 1.6.11.0 and earlier. 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 vulnerability identified as CVE-2023-41374 represents a critical double free error within Kostac PLC Programming Software version 1.6.11.0 and earlier installations. This memory corruption flaw manifests during the parsing of KPP project files, creating a scenario where an attacker can potentially execute arbitrary code on systems running affected software versions. The vulnerability specifically affects users who open project files created with earlier versions of the software, particularly those saved using Kostac PLC Programming Software Version 1.6.9.0 or earlier. The double free condition occurs when the software attempts to release the same memory block twice, which can lead to unpredictable behavior and potential code execution privileges for malicious actors. This type of vulnerability falls under CWE-415, which specifically addresses double free conditions in memory management, making it a serious concern for industrial control systems and programmable logic controller environments where software reliability is paramount.
The operational impact of this vulnerability extends beyond simple memory corruption, as it creates a potential attack vector for malicious actors to compromise industrial control systems that rely on Kostac PLC Programming Software. When a user opens a specially crafted project file, the memory management error can be triggered, potentially allowing attackers to execute arbitrary code with the privileges of the user running the software. This presents a significant risk in industrial environments where PLC programming software is used to configure critical infrastructure systems. The vulnerability's exploitation requires social engineering to convince users to open malicious project files, but once triggered, it can provide attackers with persistent access to the system. The ATT&CK framework categorizes this as a privilege escalation technique through software exploitation, specifically targeting the execution phase where malicious code can be introduced through compromised software components.
The mitigation strategy recommended by the vendor focuses on the remediation of affected project files rather than a simple software update approach. This approach is necessary because the vulnerability exists in the file parsing mechanism rather than the core software execution environment, meaning that files created with vulnerable versions cannot be safely opened with newer versions without first being re-saved. The solution requires users to re-save any project files created with Kostac PLC Programming Software Version 1.6.9.0 or earlier using version 1.6.10.0 or later, which implements protective functions against project file alterations. This mitigation approach aligns with industry best practices for handling file format vulnerabilities, where the focus is on sanitizing existing data rather than simply patching the software. The requirement for re-saving files creates operational overhead for organizations but is necessary to prevent potential exploitation. Organizations should implement procedures to ensure all project files are re-saved using the patched version, and consider establishing secure file handling protocols to prevent introduction of malicious project files into their development environments. The vulnerability demonstrates the importance of proper file validation and memory management in industrial software, where the consequences of memory corruption can extend beyond simple application crashes to potentially affect operational technology systems.