CVE-2008-5002 in Chilkat Crypt Activex Control
Summary
by MITRE
Insecure method vulnerability in the ChilkatCrypt2.ChilkatCrypt2.1 ActiveX control (ChilkatCrypt2.dll 4.3.2.1) in Chilkat Crypt ActiveX Component allows remote attackers to create and overwrite arbitrary files via the WriteFile method. NOTE: this could be leveraged for code execution by creating executable files in Startup folders or by accessing files using hcp:// URLs. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 05/25/2025
The CVE-2008-5002 vulnerability represents a critical insecure method flaw within the ChilkatCrypt2 ActiveX control, specifically affecting version 4.3.2.1 of the Chilkat Crypt ActiveX Component. This vulnerability resides in the ChilkatCrypt2.dll library and manifests through the WriteFile method of the ChilkatCrypt2.ChilkatCrypt2.1 ActiveX control, creating a significant security risk for systems that utilize this component. The flaw allows remote attackers to execute arbitrary file operations on affected systems, fundamentally undermining the security boundaries typically maintained by ActiveX controls and browser security models.
The technical nature of this vulnerability stems from improper input validation and privilege escalation within the ActiveX control's file handling mechanisms. When the WriteFile method is invoked, it fails to properly validate file paths or enforce appropriate access controls, enabling attackers to specify arbitrary file locations for creation or overwriting. This insecure implementation directly violates fundamental security principles and creates a path for attackers to manipulate the file system in ways that should be restricted to authorized processes only. The vulnerability operates at the system level, bypassing typical browser sandboxing mechanisms that would normally protect against such file system modifications.
The operational impact of this vulnerability extends far beyond simple file manipulation, as it provides attackers with potential code execution capabilities through strategic file placement. Attackers can leverage this vulnerability to create executable files in system startup folders such as the Windows startup directory, ensuring persistent execution of malicious code upon system reboot. Additionally, the vulnerability can be exploited through hcp:// URL schemes, which are used by Internet Explorer to access help files and can be manipulated to execute malicious code through the vulnerable ActiveX control. This dual exploitation vector significantly increases the attack surface and makes the vulnerability particularly dangerous in enterprise environments where ActiveX controls are commonly deployed.
The security implications of this vulnerability align with CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-73 (External Control of File Name or Path) categories, demonstrating how improper input validation can lead to arbitrary file operations. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.005 (Command and Scripting Interpreter: Visual Basic) and T1547.001 (Boot or Logon Autostart Execution: Registry Run Keys) as attackers can leverage the file creation capabilities to establish persistence. The vulnerability also represents a classic example of privilege escalation through insecure ActiveX controls, where the control's elevated privileges are improperly constrained.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. Organizations should immediately remove or disable the vulnerable ChilkatCrypt2 ActiveX control from affected systems and update to patched versions of the component. System administrators should implement strict ActiveX control policies through Group Policy or similar management tools to prevent unauthorized ActiveX controls from executing. Additionally, network segmentation and browser security hardening measures should be implemented to reduce the attack surface. Regular security assessments should include ActiveX control inventory and vulnerability scanning to identify similar insecure components. The vulnerability also highlights the importance of proper input validation and privilege separation in component design, as outlined in secure coding practices recommended by organizations such as the Open Web Application Security Project and the National Institute of Standards and Technology.