CVE-2006-4661 in ICQ Toolbar
Summary
by MITRE
AOL ICQ Toolbar 1.3 for Internet Explorer (toolbaru.dll) does not properly validate the origin of the configuration web page (options2.html), which allows user-assisted remote attackers to provide a web page that contains disguised checkboxes that trick the user into reconfiguring the toolbar.
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Analysis
by VulDB Data Team • 09/23/2017
The vulnerability identified as CVE-2006-4661 represents a significant security flaw in the AOL ICQ Toolbar version 1.3 for Internet Explorer, specifically within the toolbaru.dll component. This issue stems from inadequate validation mechanisms that fail to properly authenticate the source of configuration web pages, creating a pathway for malicious actors to manipulate user interactions through deceptive web content. The vulnerability exists in the toolbar's configuration interface where users can adjust various settings and preferences through the options2.html web page.
The technical flaw manifests in the toolbar's failure to implement proper origin validation when processing configuration requests. When users access the toolbar configuration interface, the system should verify that the web page originates from a trusted source within the legitimate AOL ICQ toolbar domain. However, the current implementation allows arbitrary web pages to present themselves as legitimate configuration interfaces, enabling attackers to craft deceptive content that mimics the toolbar's legitimate settings page. This lack of source verification creates an environment where user interactions can be manipulated through social engineering techniques that exploit user trust in familiar interface elements.
The operational impact of this vulnerability is substantial as it enables user-assisted remote code execution through phishing-like attacks. Attackers can craft malicious web pages that contain disguised checkboxes and other interface elements designed to trick users into believing they are making legitimate configuration changes. When users interact with these deceptive interfaces, they unknowingly modify toolbar settings or grant permissions that could lead to further compromise. This vulnerability specifically targets the user's trust in familiar software interfaces and exploits the natural tendency of users to accept configuration prompts without questioning their legitimacy.
The security implications extend beyond simple configuration manipulation and align with common attack patterns documented in the attack framework. This vulnerability demonstrates characteristics consistent with CWE-346, which addresses improper validation of source of data, and reflects techniques used in phishing attacks documented in MITRE ATT&CK matrix under initial access and privilege escalation phases. The attack requires user interaction but leverages the trust relationship between the user and the toolbar application to achieve its objectives.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and origin verification mechanisms within the toolbar component. The most effective approach involves modifying the toolbaru.dll module to enforce strict validation of web page origins before allowing configuration changes to be processed. Security patches should implement certificate validation or domain-based authentication to ensure that only trusted sources can provide configuration interfaces. Additionally, users should be educated about the importance of verifying interface authenticity and should be cautious when presented with configuration prompts from unfamiliar sources, particularly when the prompts contain unexpected interface elements or request unusual permissions.