CVE-2004-0909 in Mozilla
Summary
by MITRE
Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 may allow remote attackers to trick users into performing unexpected actions, including installing software, via signed scripts that request enhanced abilities using the enablePrivilege parameter, then modify the meaning of certain security-relevant dialog messages.
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Analysis
by VulDB Data Team • 11/21/2024
This vulnerability represents a sophisticated privilege escalation attack vector that exploited the trust model within Mozilla's security architecture. The flaw existed in versions of Firefox prior to the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8, where the enablePrivilege parameter could be manipulated to grant scripts elevated permissions. The vulnerability stems from the browser's handling of security dialogs and the ability of malicious actors to intercept and modify the meaning of security-relevant user prompts. This issue directly relates to CWE-284, which addresses improper access control, and demonstrates how privilege management can be subverted through user interface manipulation. Attackers could craft signed scripts that would request enhanced privileges, then exploit the security dialog mechanism to make users unknowingly approve malicious actions.
The technical implementation of this vulnerability involved exploiting the browser's security model where signed scripts could request privileged operations through the enablePrivilege API. When legitimate scripts requested enhanced abilities, the browser would display security dialogs to confirm these requests. However, the vulnerability allowed attackers to modify the content or meaning of these dialogs, effectively tricking users into approving actions they would not have otherwise consented to. This manipulation occurred at the user interface level where security warnings were presented, making the attack particularly insidious as users believed they were interacting with legitimate security prompts. The flaw essentially created a situation where the browser's own security warnings could be spoofed or manipulated to serve malicious purposes, undermining the fundamental principle of user consent in security operations.
The operational impact of this vulnerability was significant for users of affected versions, as it enabled a wide range of malicious activities that could be executed under the guise of legitimate security operations. Users could be tricked into installing malware, modifying system settings, or performing other harmful actions while believing they were simply confirming security warnings. This vulnerability particularly affected the trust relationship between users and their browsers, as it demonstrated how security dialogs could be subverted to bypass user intent. The attack could be executed remotely through web pages or email attachments, making it particularly dangerous in phishing scenarios. Organizations using these vulnerable versions faced increased risk of social engineering attacks and potential system compromise, as users might unknowingly grant malicious scripts the privileges they needed to execute harmful operations.
Mitigation strategies for this vulnerability required immediate patching of affected browser versions to address the privilege escalation mechanism and dialog manipulation flaws. Users should have upgraded to Mozilla 1.7.3 for Firefox, Mozilla 1.7.3 for the main browser, and Thunderbird 0.8 or later to resolve the issue. Security administrators needed to implement monitoring for suspicious script behavior and ensure that users were aware of the risks associated with unsigned or untrusted scripts. The fix involved strengthening the security dialog mechanism to prevent modification of security-relevant messages and reinforcing the privilege management system to ensure that elevated permissions could not be granted through manipulated user prompts. Organizations should have also reviewed their security policies regarding script execution and user consent procedures, as this vulnerability highlighted the importance of robust user interface security controls that cannot be easily subverted by malicious actors.