CVE-2006-3424 in WebEx Downloader ActiveX Control
Summary
by MITRE
Multiple buffer overflows in WebEx Downloader ActiveX Control, possibly in versions before November 2005, allow remote attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 09/17/2017
The CVE-2006-3424 vulnerability represents a critical security flaw in the WebEx Downloader ActiveX control, a component widely used for downloading and installing Cisco WebEx software applications. This vulnerability emerged during a period when ActiveX controls were prevalent in enterprise environments, particularly within corporate networks where remote collaboration tools were extensively deployed. The affected WebEx Downloader ActiveX control was vulnerable to multiple buffer overflow conditions that could be exploited by remote attackers to gain unauthorized execution of arbitrary code on targeted systems. These buffer overflows occurred within the control's handling of user-supplied input, specifically in the processing of data from network sources or local files that the control would parse during normal operation.
The technical nature of this vulnerability stems from improper bounds checking within the ActiveX control's implementation, creating conditions where malicious input could overwrite adjacent memory locations beyond the allocated buffer space. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers stack-based buffer overflow scenarios. The flaw allowed attackers to craft specially formatted input that would trigger memory corruption when processed by the vulnerable ActiveX control, potentially leading to complete system compromise. The unspecified vectors mentioned in the original description suggest that the vulnerability could be triggered through multiple attack surfaces including web-based downloads, file processing, or network communications that the control would handle during normal operation.
The operational impact of CVE-2006-3424 was significant within enterprise environments where WebEx was commonly deployed for video conferencing and remote collaboration. Attackers could exploit this vulnerability to execute malicious code with the privileges of the user running the affected ActiveX control, typically resulting in system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability was particularly dangerous because ActiveX controls often ran with elevated privileges, and many organizations had not implemented proper security measures to restrict ActiveX control execution or had not kept their WebEx installations updated. The risk was amplified in corporate environments where network administrators might have deployed the control across multiple systems without proper security assessment, making the entire network vulnerable to exploitation through a single compromised endpoint.
Organizations should have implemented several mitigation strategies to address this vulnerability, including immediate patching of the WebEx Downloader ActiveX control to versions released after November 2005, when the vulnerability was addressed by Cisco. Security administrators should have enforced strict ActiveX control policies, limiting execution to trusted sources only, and implemented network segmentation to prevent lateral movement once an attacker gained initial access. According to ATT&CK framework, this vulnerability would map to techniques involving exploitation of known vulnerabilities and privilege escalation, with potential use of T1190 for exploiting remote services and T1068 for local privilege escalation. Additionally, organizations should have deployed application whitelisting solutions and implemented security awareness training to prevent users from inadvertently triggering the exploit through malicious web content or email attachments. The vulnerability highlighted the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against ActiveX-based attacks in enterprise environments.