CVE-2008-20001 in WebGrabber
Summary
by MITRE • 08/30/2025
activePDF WebGrabber version 3.8.2.0 contains a stack-based buffer overflow vulnerability in the GetStatus() method of the APWebGrb.ocx ActiveX control. By passing an overly long string to this method, a remote attacker can execute arbitrary code in the context of the vulnerable process. Although the control is not marked safe for scripting, exploitation is possible via crafted HTML content in Internet Explorer under permissive security settings.
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Analysis
by VulDB Data Team • 08/31/2025
The activePDF WebGrabber version 3.8.2.0 vulnerability represents a critical stack-based buffer overflow flaw within the APWebGrb.ocx ActiveX control that poses significant security risks to affected systems. This vulnerability specifically targets the GetStatus() method, which fails to properly validate input length before processing user-supplied data. The flaw stems from inadequate bounds checking mechanisms that allow malicious actors to overflow the allocated stack buffer, potentially leading to arbitrary code execution. The vulnerability is particularly concerning because ActiveX controls are inherently trusted components within internet explorer environments, making them prime targets for exploitation in web-based attacks.
The technical implementation of this vulnerability demonstrates a classic buffer overflow condition where the GetStatus() method does not enforce maximum string length constraints before copying input data to a fixed-size stack buffer. When an attacker supplies an excessively long string parameter, the data overflows beyond the allocated memory boundaries, corrupting adjacent stack memory locations including return addresses and control flow information. This memory corruption can be leveraged to redirect program execution to attacker-controlled code, effectively allowing remote code execution with the privileges of the vulnerable process. The vulnerability operates through the standard exploitation techniques of stack-based buffer overflows, where the overflowed data can overwrite the return address on the stack, enabling attackers to inject and execute malicious payloads.
The operational impact of this vulnerability extends beyond simple code execution, as it can be exploited through web-based attack vectors without requiring local system access or elevated privileges. Attackers can craft malicious HTML content that includes specially formatted parameters to the GetStatus() method, which when processed by Internet Explorer under permissive security settings, triggers the buffer overflow condition. The fact that the ActiveX control is not marked as safe for scripting does not prevent exploitation since the attack can be delivered through carefully constructed web pages that leverage the browser's ActiveX support. This makes the vulnerability particularly dangerous in enterprise environments where users may encounter malicious web content through phishing campaigns or compromised websites. The exploitation requires minimal user interaction beyond visiting a malicious webpage, making it a significant threat vector for widespread compromise.
Mitigation strategies for this vulnerability should focus on immediate remediation through software updates and security configuration changes. Organizations must prioritize updating to patched versions of activePDF WebGrabber that address the buffer overflow condition in the GetStatus() method. Until updates are applied, security administrators should implement browser security restrictions including disabling ActiveX controls, enforcing strict security zones, and implementing content filtering solutions to prevent access to potentially malicious web content. The vulnerability aligns with CWE-121 stack-based buffer overflow classification and represents a technique commonly used in the attack lifecycle documented in the MITRE ATT&CK framework under the execution and privilege escalation phases. Additional defensive measures include network-based intrusion detection systems that can identify suspicious ActiveX control usage patterns and endpoint protection solutions that monitor for abnormal memory access behaviors associated with buffer overflow exploitation attempts.