CVE-2008-0237 in Rich Textbox Control
Summary
by MITRE
The Microsoft Rich Textbox ActiveX Control (RICHTX32.OCX) 6.1.97.82 allows remote attackers to execute arbitrary commands by invoking the insecure SaveFile method.
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Analysis
by VulDB Data Team • 10/14/2024
The vulnerability identified as CVE-2008-0237 resides within the Microsoft Rich Textbox ActiveX Control version 6.1.97.82 which is commonly referred to as RICHTX32.OCX. This ActiveX control is a component that enables rich text editing functionality within web applications and desktop environments, particularly in older versions of Microsoft Office and Internet Explorer. The flaw manifests in the SaveFile method of this control, which lacks proper input validation and security checks. When exploited, this vulnerability allows remote attackers to execute arbitrary commands on the affected system with the privileges of the user running the vulnerable application. The attack typically occurs when a malicious website or email attachment loads the vulnerable ActiveX control and triggers the SaveFile method with crafted parameters that result in code execution.
This vulnerability represents a classic example of insecure deserialization and command execution through ActiveX controls, falling under the CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component category. The flaw exploits the trust model inherent in ActiveX controls where components are allowed to execute with the privileges of the user who loaded them. The vulnerability is particularly dangerous because it can be triggered remotely through web browsers that have ActiveX support enabled, making it a significant threat in enterprise environments where users might inadvertently visit malicious websites or open compromised email attachments. The attack vector relies on the user's browser automatically loading and executing the vulnerable ActiveX control, which is often enabled by default in older versions of Internet Explorer.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential lateral movement within networks. Attackers can leverage this vulnerability to download and install additional malware, establish persistence mechanisms, or escalate privileges to gain administrative access to affected systems. The vulnerability affects systems running older versions of Microsoft Office and Internet Explorer, particularly those with ActiveX controls enabled, creating a broad attack surface across enterprise environments. The security implications are further compounded by the fact that many organizations were slow to patch this vulnerability due to its reliance on legacy ActiveX components that were not commonly updated outside of major security patches. This vulnerability aligns with ATT&CK technique T1190 - Exploit Public-Facing Application, specifically targeting web-based attack surfaces where ActiveX controls are deployed.
Mitigation strategies for CVE-2008-0237 require a multi-layered approach focusing on both immediate remediation and long-term security posture improvements. The primary recommendation involves applying the relevant Microsoft security updates that patch the vulnerable ActiveX control, though organizations may need to consider the broader impact of disabling ActiveX controls entirely from web browsers. Network segmentation and browser hardening measures should be implemented to prevent automatic execution of ActiveX content, including disabling ActiveX controls in Internet Explorer or using more secure browsers. Organizations should also implement application whitelisting policies to prevent execution of unauthorized ActiveX controls and regularly audit their systems for the presence of vulnerable components. The vulnerability underscores the importance of maintaining up-to-date security patches and demonstrates the risks associated with legacy components that remain in production environments without proper security controls. Additionally, user education regarding suspicious website visits and email attachments remains critical in preventing exploitation of this vulnerability, as it relies heavily on user interaction to achieve successful compromise.