CVE-2006-3961 in AntiSpyware
Summary
by MITRE
Buffer overflow in McSubMgr ActiveX control (mcsubmgr.dll) in McAfee Security Center 6.0.23 for Internet Security Suite 2006, Wireless Home Network Security, Personal Firewall Plus, VirusScan, Privacy Service, SpamKiller, AntiSpyware, and QuickClean allows remote user-assisted attackers to execute arbitrary commands via long string parameters, which are later used in vsprintf.
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Analysis
by VulDB Data Team • 01/13/2025
The vulnerability identified as CVE-2006-3961 represents a critical buffer overflow flaw within the McSubMgr ActiveX control component of McAfee Security Center 6.0.23. This issue affects multiple McAfee security products including Internet Security Suite 2006, Wireless Home Network Security, Personal Firewall Plus, VirusScan, Privacy Service, SpamKiller, AntiSpyware, and QuickClean. The vulnerability stems from improper input validation within the mcsubmgr.dll library, which processes user-supplied string parameters without adequate bounds checking. When these parameters are subsequently passed to the vsprintf function, the lack of proper buffer size management creates an exploitable condition that can be leveraged by malicious actors to execute arbitrary code on affected systems. The attack vector requires remote user-assisted execution, meaning that an attacker must convince a user to visit a malicious website or open a specially crafted file containing the vulnerable ActiveX control.
This buffer overflow vulnerability directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The technical implementation involves the ActiveX control receiving overly long string parameters that exceed the allocated buffer space, causing memory corruption that can be manipulated to redirect program execution flow. The vsprintf function, which is commonly used for formatted string operations, becomes particularly dangerous when fed with untrusted input without proper validation, as it does not perform automatic bounds checking. The vulnerability is particularly concerning because it affects multiple McAfee security products, creating a widespread attack surface that could potentially compromise systems running any of these security applications. The use of ActiveX controls in web browsers provides an additional attack surface since these components can be automatically executed when visiting compromised websites, making this vulnerability particularly dangerous in a web-based threat landscape.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. Attackers who successfully exploit this buffer overflow can gain elevated privileges on vulnerable systems, potentially allowing them to install malware, modify system files, or establish persistent backdoors. The remote user-assisted nature of the attack means that victims do not need to perform any special actions beyond visiting a malicious website, making this vulnerability particularly effective in phishing campaigns or drive-by download attacks. Security researchers have noted that the exploitation of such vulnerabilities in security software creates a particularly dangerous scenario, as attackers can potentially bypass the very protections that users rely upon to secure their systems. The affected products are widely deployed across enterprise and consumer environments, amplifying the potential impact of successful exploitation. This vulnerability also represents a significant concern for organizations that depend on McAfee security solutions, as it could allow attackers to compromise entire networks through a single vulnerable endpoint.
Mitigation strategies for CVE-2006-3961 should focus on immediate patching of affected McAfee products, as the vendor has released security updates to address this vulnerability. Organizations should implement strict browser security policies that disable ActiveX controls or restrict their execution to trusted sites only. Network segmentation and application whitelisting can help limit the potential impact of successful exploitation by preventing lateral movement within compromised networks. Security monitoring should include detection of unusual ActiveX control usage patterns and potential exploitation attempts. The vulnerability also highlights the importance of input validation and secure coding practices, particularly when dealing with string manipulation functions like vsprintf that require careful bounds checking. Organizations should conduct regular vulnerability assessments to identify similar issues in other ActiveX controls or legacy software components. This vulnerability demonstrates the critical need for security professionals to maintain awareness of both known and emerging threats in security software, as these applications often become primary targets for attackers seeking to compromise user systems. The incident serves as a reminder that even security products themselves can contain vulnerabilities that require careful management and timely remediation.