CVE-2007-1004 in Firefox
Summary
by MITRE
Mozilla Firefox might allow remote attackers to conduct spoofing and phishing attacks by writing to an about:blank tab and overlaying the location bar.
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Analysis
by VulDB Data Team • 08/10/2019
The vulnerability described in CVE-2007-1004 represents a significant browser security flaw in Mozilla Firefox that enabled sophisticated phishing and spoofing attacks. This issue stems from how Firefox handled the display of content within about:blank tabs and the subsequent overlaying of the location bar, creating a dangerous misrepresentation of web navigation. The vulnerability exploited the browser's rendering and security model to deceive users into believing they were visiting legitimate websites when in fact they were interacting with malicious content.
The technical flaw resides in Firefox's implementation of the about:blank URI handling mechanism combined with improper security boundary enforcement. When a malicious website attempted to write content to an about:blank tab, the browser would display this content while simultaneously overlaying the location bar with false information. This created a scenario where attackers could craft deceptive interfaces that appeared to show legitimate URLs while actually displaying malicious content. The vulnerability specifically targeted the browser's user interface security model, allowing attackers to manipulate the visual representation of the current browsing context. According to CWE-200, this represents a weakness in the system where information is disclosed to unauthorized actors, while the attack vector aligns with CWE-668 which describes insufficient resource pool access control.
The operational impact of this vulnerability was substantial as it enabled attackers to conduct sophisticated phishing campaigns that could bypass user security awareness and traditional browser protections. Users were deceived into entering sensitive information on fraudulent pages that appeared to be legitimate websites, with the browser's location bar displaying false information that reinforced the deception. The attack could be executed through various means including malicious JavaScript code, iframe manipulation, or other web-based attack vectors that leveraged the browser's tab management and content rendering capabilities. This vulnerability effectively undermined the browser's security model by allowing unauthorized manipulation of the user interface elements that users rely upon for navigation verification and security assessment.
Mitigation strategies for this vulnerability required both immediate browser updates and user education initiatives. Mozilla released patches to fix the underlying implementation flaw in how about:blank tabs were handled and how location bar overlays were managed. Security researchers recommended that users keep their browsers updated with the latest security patches and remain vigilant about URL verification even when the location bar appears to show legitimate addresses. Organizations implementing browser security policies needed to consider this vulnerability when establishing security guidelines and user training programs. The fix involved strengthening the security boundaries between different content contexts and ensuring that location bar information could not be overridden by content loaded in about:blank tabs. This vulnerability highlighted the importance of maintaining strict separation between browser interface elements and content rendering processes, aligning with ATT&CK technique T1056.001 which covers input injection attacks that manipulate user interface elements to deceive users into providing sensitive information.