CVE-2024-10462 in Thunderbird
Summary
by MITRE • 10/29/2024
Truncation of a long URL could have allowed origin spoofing in a permission prompt. This vulnerability affects Firefox < 132, Firefox ESR < 128.4, Thunderbird < 128.4, and Thunderbird < 132.
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Analysis
by VulDB Data Team • 03/02/2025
This vulnerability represents a critical security flaw in Mozilla's browser and email client applications that could enable attackers to manipulate user trust decisions during permission prompts. The issue stems from how these applications handle URL display when the full address exceeds the available screen space, creating a potential vector for social engineering attacks. When a URL becomes too long for the permission dialog interface, the system truncates the address in a manner that could obscure the true origin of a request, allowing malicious actors to craft deceptive URLs that appear legitimate to users who might otherwise reject suspicious permission requests.
The technical implementation of this vulnerability involves the URL truncation algorithm within the permission prompt system, where the application fails to properly handle long URLs in a way that maintains user awareness of the actual source. This behavior creates a scenario where the truncated display might show a portion of a malicious domain that appears to match a trusted domain, or where the truncation occurs at a point that obscures the true origin. The flaw specifically affects the visual representation of URLs in permission dialogs, which are designed to help users make informed decisions about granting access to potentially sensitive resources. According to CWE-20, this vulnerability falls under the category of improper input validation, specifically related to improper handling of input that affects security decisions. The weakness manifests when the application's URL display mechanism fails to ensure that users can always identify the true source of a request, even when the full URL exceeds display limitations.
The operational impact of this vulnerability extends beyond simple visual deception, as it directly undermines the security model that permission prompts are designed to enforce. Users rely on the accurate display of URLs to make informed decisions about granting permissions to websites or applications, and this truncation flaw creates opportunities for attackers to bypass user consent mechanisms. When a user encounters a permission prompt, they expect to see the complete origin of the request, and the truncation behavior could lead to situations where users unknowingly grant permissions to malicious actors who have crafted URLs designed to appear legitimate after truncation. This vulnerability particularly affects the trust model between users and applications, where users must be able to verify the identity of requesting entities before authorizing access to their resources, and the truncation creates a gap in this verification process.
Mitigation strategies for this vulnerability involve both immediate application updates and user awareness training. The primary fix requires updating to the patched versions of Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR, where the URL truncation behavior has been modified to maintain user awareness of the complete origin. Security researchers have identified that the patched implementations now ensure that URL truncation occurs in a manner that preserves the ability to distinguish between legitimate and malicious origins, often by truncating at domain boundaries or ensuring that the beginning and end of the URL remain visible. Organizations should prioritize immediate deployment of these updates across all affected systems, as the vulnerability could be exploited in targeted attacks where attackers craft URLs designed to exploit the truncation behavior. Additionally, user education about the importance of carefully examining permission prompts and understanding that truncated URLs may be misleading should be emphasized, though this represents a secondary defense since the primary mitigation lies in the application's proper handling of URL display. The vulnerability demonstrates the critical importance of maintaining proper input handling and user interface design in security-sensitive contexts, where even seemingly minor display issues can create significant security risks. According to ATT&CK framework, this vulnerability relates to T1059.001 for execution through user interaction and T1566 for social engineering techniques that exploit user trust in permission prompts.