CVE-2014-1561 in Firefox
Summary
by MITRE
Mozilla Firefox before 31.0 does not properly restrict use of drag-and-drop events to spoof customization events, which allows remote attackers to alter the placement of UI icons via crafted JavaScript code that is encountered during (1) page, (2) panel, or (3) toolbar customization.
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Analysis
by VulDB Data Team • 02/09/2022
This vulnerability resides in the Firefox browser's implementation of drag-and-drop functionality within its user interface customization system. The flaw stems from insufficient validation of drag-and-drop events that are processed during various customization phases including page, panel, and toolbar modifications. Attackers can exploit this weakness by crafting malicious javascript code that manipulates these events to deceive the browser into altering the positions of user interface elements. The vulnerability specifically affects Firefox versions prior to 31.0, indicating a long-standing issue in the browser's security model for handling user interaction events.
The technical mechanism of exploitation involves the manipulation of legitimate drag-and-drop APIs that Firefox provides for UI customization purposes. When users engage in customization activities such as repositioning toolbar items or modifying panel layouts, the browser processes these events through its event handling system. However, the vulnerability allows attackers to inject malicious code that leverages the same event processing mechanisms to perform unauthorized UI modifications. This occurs because Firefox fails to properly validate the source and authenticity of drag-and-drop events during the customization process, creating an opportunity for remote code execution through crafted javascript payloads.
The operational impact of this vulnerability extends beyond simple UI manipulation as it represents a significant security risk for user interface integrity. Attackers can potentially create deceptive user experiences where legitimate interface elements appear to be in one location while actually being moved to different positions, potentially leading to confusion or security misdirection. The ability to manipulate toolbar placements could allow attackers to hide critical security indicators or move important interface elements out of expected locations, making it difficult for users to identify malicious activities or access important security features. This vulnerability falls under the category of user interface spoofing attacks that can compromise user trust and security awareness.
The security implications of this vulnerability align with several common attack patterns documented in the attack mitigation framework. This flaw demonstrates characteristics similar to those described in the attack technique of modifying user interface elements to deceive users, which can be classified under attack patterns involving user interface manipulation. The vulnerability also relates to the concept of privilege escalation through interface manipulation, where attackers can exploit legitimate browser features to achieve unauthorized modifications. From a defensive perspective, this vulnerability highlights the importance of proper input validation and event source verification in browser security models, particularly for features that involve user interaction and customization.
Mitigation strategies for this vulnerability should focus on strengthening the validation mechanisms within Firefox's drag-and-drop event handling system. Browser vendors should implement stricter source verification for all drag-and-drop events, particularly those that trigger UI customization operations. The solution involves ensuring that only legitimate user interactions can trigger customization events while preventing malicious javascript from injecting unauthorized modifications. Additionally, implementing proper sandboxing techniques for customization operations and adding additional layers of authentication for UI modification events would significantly reduce the risk. Users should be encouraged to keep their browsers updated to versions that include patches for this vulnerability, as the fix typically involves enhanced validation of event sources and more robust event handling procedures that prevent unauthorized modifications to the user interface during customization processes.
This vulnerability demonstrates the importance of considering user interaction events in browser security models, particularly when implementing features that involve user customization. The flaw represents a classic case where legitimate browser functionality was exploited to create security risks, highlighting the need for comprehensive security testing that considers both functional and security aspects of user interface components. The remediation approach typically involves implementing stricter validation of event sources and ensuring that all UI modification operations are properly authenticated and authorized. This type of vulnerability is particularly concerning because it can be exploited remotely without requiring any special privileges or user interaction beyond visiting a malicious webpage, making it a significant concern for browser security implementations. The fix generally requires modifications to the browser's event handling system to properly validate the legitimacy of drag-and-drop operations during customization processes, ensuring that only authorized user interactions can modify the interface layout.