CVE-2008-4549 in ImageShack Toolbar
Summary
by MITRE
The ImageShack Toolbar ActiveX control (ImageShackToolbar.dll) in ImageShack Toolbar 4.5.7, possibly including 4.5.7.69, allows remote attackers to force the upload of arbitrary image files to the ImageShack site via a file: URI argument to the BuildSlideShow method.
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Analysis
by VulDB Data Team • 10/14/2024
The vulnerability identified as CVE-2008-4549 represents a critical security flaw in the ImageShack Toolbar ActiveX control that affects versions 4.5.7 and potentially 4.5.7.69. This issue resides within the ImageShackToolbar.dll component which is part of the broader ImageShack toolbar suite designed for web browser integration. The vulnerability stems from improper input validation within the BuildSlideShow method that processes file: URI arguments without adequate sanitization or access controls. This design flaw creates a significant attack surface that allows malicious actors to exploit the toolbar's functionality for unauthorized file uploads to the ImageShack image hosting service.
The technical implementation of this vulnerability demonstrates a classic case of insecure file handling within ActiveX controls, which fall under CWE-22 - Improper Limitation of a Pathname to a Restricted Directory. The flaw specifically manifests when the BuildSlideShow method accepts file: URI arguments that point to local image files on the victim's system. Due to insufficient validation of these URI parameters, an attacker can craft malicious web pages or exploit code that triggers the toolbar's upload functionality with arbitrary file paths. The ActiveX control lacks proper access control mechanisms to verify that uploaded files originate from legitimate sources or meet security requirements, enabling unauthorized file transfers to the remote ImageShack servers.
Operationally, this vulnerability presents a substantial risk to users who have the ImageShack toolbar installed on their systems, particularly those running vulnerable versions. The attack vector typically involves social engineering campaigns where users are directed to malicious websites containing specially crafted HTML code that leverages the ActiveX control's functionality. When executed, the malicious code forces the toolbar to upload images from the user's local system without their knowledge or consent, potentially including sensitive documents, personal photographs, or system files. This unauthorized data exfiltration capability represents a significant privacy and security concern that can be exploited for reconnaissance purposes or to gather sensitive information from compromised systems.
The impact of this vulnerability extends beyond simple unauthorized file uploads and aligns with several ATT&CK framework techniques including T1195.001 - Supply Chain Compromise and T1059.001 - Command and Scripting Interpreter. Attackers can leverage this flaw as part of broader exploitation chains where the toolbar serves as a foothold for additional malicious activities. The vulnerability also demonstrates weaknesses in ActiveX security model implementation that were common in legacy browser extensions during this period, highlighting the need for proper input validation and access control mechanisms. Organizations and individuals should consider this vulnerability as part of their broader security posture assessment, particularly in environments where legacy ActiveX components remain in use.
Mitigation strategies for this vulnerability should focus on immediate remediation through software updates from ImageShack, as well as broader security measures including ActiveX control disablement in browser settings. The recommended approach includes implementing browser security policies that restrict ActiveX control execution, deploying application whitelisting controls to prevent unauthorized ActiveX components from running, and conducting comprehensive security audits to identify other potentially vulnerable ActiveX controls. Additionally, users should be educated about the risks associated with ActiveX controls and the importance of keeping software updated to prevent exploitation of known vulnerabilities. Organizations should also consider implementing network monitoring solutions to detect unauthorized file upload activities that could indicate exploitation of this and similar vulnerabilities.