CVE-2006-3890 in WinZip
Summary
by MITRE
Stack-based buffer overflow in the Sky Software FileView ActiveX control, as used in WinZip 10 before build 7245 and in certain other applications, allows remote attackers to execute arbitrary code via a long FilePattern attribute in a WZFILEVIEW object, a different vulnerability than CVE-2006-5198.
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Analysis
by VulDB Data Team • 04/28/2026
The vulnerability described in CVE-2006-3890 represents a critical stack-based buffer overflow affecting the Sky Software FileView ActiveX control implementation within WinZip 10 versions prior to build 7245 and other affected applications. This vulnerability resides within the handling of the FilePattern attribute within the WZFILEVIEW object, creating a pathway for remote code execution through maliciously crafted input. The flaw demonstrates a classic software security weakness where insufficient bounds checking allows attackers to overwrite adjacent memory locations on the stack, potentially leading to arbitrary code execution with the privileges of the affected application. The vulnerability is particularly concerning as it operates through ActiveX controls, which are commonly deployed in web environments and trusted by users, making exploitation more likely and impactful.
The technical implementation of this buffer overflow occurs when the FileView ActiveX control processes the FilePattern attribute without proper validation of input length. When an attacker supplies a specially crafted string that exceeds the allocated buffer size, the excess data overflows into adjacent stack memory regions. This overflow can overwrite return addresses, function pointers, and other critical control data structures, allowing an attacker to redirect program execution flow. The vulnerability is classified as a stack-based buffer overflow under CWE-121, which specifically addresses buffer overflow conditions where data is written beyond the boundaries of a stack-based buffer. The attack vector requires remote delivery through web content or malicious files that trigger the ActiveX control execution, making it particularly dangerous in browser-based environments where users may unknowingly execute malicious code.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the ability to gain complete control over affected systems. Successful exploitation can result in privilege escalation, system compromise, and potential lateral movement within network environments where WinZip or affected applications are installed. The vulnerability affects not only WinZip users but also any application that incorporates the Sky Software FileView ActiveX control, creating a widespread attack surface. From an operational security perspective, this vulnerability aligns with ATT&CK technique T1190, which covers Exploit Public-Facing Application, and T1059, covering Command and Scripting Interpreter, as attackers can leverage the compromised system to execute additional malicious payloads or establish persistence mechanisms.
Mitigation strategies for CVE-2006-3890 focus primarily on patching the vulnerable ActiveX control and updating WinZip to versions that address the buffer overflow. Organizations should implement immediate remediation measures by upgrading to WinZip build 7245 or later, which contains the necessary security fixes. Additional protective measures include disabling ActiveX controls in web browsers, implementing application whitelisting policies, and using security software that can detect and block malicious ActiveX content. Network segmentation and monitoring for suspicious ActiveX control usage can help identify potential exploitation attempts. Security teams should also consider implementing web application firewalls and content filtering solutions to prevent delivery of malicious content that could trigger this vulnerability. The vulnerability underscores the importance of regular security updates and the need for comprehensive application security testing, particularly for components that interact with user-supplied input through web-based interfaces.