CVE-2008-3558 in WebEx Meeting Manager
Summary
by MITRE
Stack-based buffer overflow in the WebexUCFObject ActiveX control in atucfobj.dll in Cisco WebEx Meeting Manager before 20.2008.2606.4919 allows remote attackers to execute arbitrary code via a long argument to the NewObject method.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability identified as CVE-2008-3558 represents a critical stack-based buffer overflow flaw within the WebexUCFObject ActiveX control component of Cisco WebEx Meeting Manager. This security weakness exists in the atucfobj.dll library and specifically affects versions prior to 20.2008.2606.4919, creating a significant attack surface for remote code execution. The vulnerability manifests when a malicious attacker provides an excessively long argument to the NewObject method of the ActiveX control, which triggers the buffer overflow condition in the application's stack memory management.
The technical exploitation of this vulnerability occurs through improper input validation within the WebexUCFObject ActiveX control implementation. When the NewObject method receives a parameter exceeding the allocated buffer size, the excessive data overflows into adjacent stack memory locations, potentially overwriting critical program execution structures such as return addresses, stack canaries, or function pointers. This overflow condition enables attackers to manipulate the program's execution flow and inject malicious code that executes with the privileges of the vulnerable application, typically those of the user running the WebEx Meeting Manager client.
The operational impact of this vulnerability extends beyond simple remote code execution, as it provides attackers with a pathway to compromise entire user systems through web-based attacks. The ActiveX control's integration within web browsers makes this vulnerability particularly dangerous, as users can be exploited simply by visiting compromised websites or opening malicious email attachments that trigger the vulnerable control. The attack vector requires no user interaction beyond normal browsing activities, making it a highly effective method for widespread exploitation. This weakness directly maps to CWE-121 Stack-based Buffer Overflow, which is categorized under the broader category of memory safety vulnerabilities in the Common Weakness Enumeration system.
Organizations and users affected by this vulnerability face substantial risk of unauthorized access, data breaches, and system compromise. The exploitation of this flaw can lead to complete system takeover, persistence mechanisms, privilege escalation, and lateral movement within network environments. Security researchers have documented similar attack patterns in the ATT&CK framework under the technique of "Exploitation for Code Execution" (T1059), where adversaries leverage software vulnerabilities to execute malicious code. The vulnerability's classification as a remote code execution flaw places it within the highest severity categories of cybersecurity threats, as it requires no physical access to target systems and can be exploited through standard internet connectivity.
Mitigation strategies for CVE-2008-3558 primarily focus on immediate patching and remediation efforts, with Cisco releasing version 20.2008.2606.4919 and subsequent updates that address the buffer overflow condition. System administrators should prioritize updating all WebEx Meeting Manager installations to versions containing the security fixes, while also implementing browser security controls such as disabling ActiveX controls or restricting their execution through group policies. Additional protective measures include network-based intrusion detection systems that can identify exploitation attempts, application whitelisting to prevent execution of unauthorized ActiveX components, and regular security assessments to identify potential vulnerabilities in legacy software components. Organizations should also consider implementing web application firewalls and browser security extensions that can detect and block malicious ActiveX control interactions to prevent exploitation of this and similar vulnerabilities.