CVE-2024-6608 in Firefox
Summary
by MITRE • 07/09/2024
It was possible to move the cursor using pointerlock from an iframe. This allowed moving the cursor outside of the viewport and the Firefox window. This vulnerability affects Firefox < 128.
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Analysis
by VulDB Data Team • 03/20/2025
This vulnerability in Firefox represents a significant security flaw that undermines the browser's fundamental isolation mechanisms between different browsing contexts. The issue specifically relates to how Firefox handles pointer lock functionality within iframe environments, creating an unexpected pathway for cursor manipulation that extends beyond normal operational boundaries. The vulnerability affects versions prior to Firefox 128, indicating a prolonged window during which users were exposed to potential exploitation. This flaw demonstrates a critical failure in the browser's security model where sandboxing principles are violated, allowing cross-context cursor movement that should logically be restricted to the originating document's boundaries.
The technical implementation of this vulnerability exploits the pointer lock API's behavior when operating within iframe contexts. Normally, pointer lock should confine cursor movement to the element that has acquired lock status, typically within the same document or frame. However, this flaw enables a malicious iframe to manipulate the cursor position in such a way that it can move beyond the confines of the iframe's viewport and potentially outside the Firefox window itself. This occurs because the browser fails to properly validate or restrict pointer movement coordinates when transitioning from iframe contexts to the broader browser window. The vulnerability essentially allows an attacker to bypass the expected security boundaries that separate different browsing contexts, creating a scenario where iframe content can influence the cursor behavior of the parent window.
The operational impact of this vulnerability extends beyond simple cursor manipulation and represents a potential vector for more sophisticated attacks. Attackers could exploit this behavior to create phishing scenarios where the cursor moves outside visible browser boundaries, potentially guiding users toward malicious actions on the desktop or other applications. The ability to move the cursor outside the viewport also creates opportunities for social engineering attacks where users might be misled about their current location or context within the browser environment. This vulnerability particularly affects users who frequently interact with web content that includes embedded iframes, such as online banking, email clients, or content management systems that integrate external resources. The risk is elevated in environments where users might be tricked into interacting with malicious content that leverages this cursor manipulation capability to create deceptive user experiences.
This vulnerability aligns with several cybersecurity frameworks and threat models, particularly those addressing browser sandboxing and privilege escalation. It relates to CWE-254 as it represents a security vulnerability in the implementation of a security feature, specifically the pointer lock API's context handling. The issue also connects to ATT&CK technique T1059 which involves executing malicious code through browser-based attacks, and T1071 which encompasses application layer protocols and browser exploitation techniques. The vulnerability demonstrates the importance of proper context validation in web APIs and highlights the need for comprehensive security testing of browser features that interact with system-level components. Security researchers should consider this as a potential precursor to more serious attacks involving user interface manipulation, input redirection, or malicious application interaction that could be combined with other vulnerabilities to create more sophisticated attack vectors.
Mitigation strategies should focus on immediate patching of affected Firefox versions to version 128 or later where this vulnerability has been addressed. Organizations should also implement browser hardening policies that restrict iframe usage in sensitive environments and consider additional security controls that monitor for unusual cursor behavior patterns. Users should be educated about the risks associated with interacting with untrusted content that includes embedded iframes, particularly in contexts where sensitive data is handled. The vulnerability underscores the importance of maintaining up-to-date browser software and implementing layered security approaches that reduce the attack surface available to potential exploiters. Regular security assessments of browser configurations and monitoring for anomalous cursor movement patterns can help detect potential exploitation attempts before they lead to successful attacks.