CVE-2012-3986 in Firefox
Summary
by MITRE
Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 do not properly restrict calls to DOMWindowUtils (aka nsDOMWindowUtils) methods, which allows remote attackers to bypass intended access restrictions via crafted JavaScript code.
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Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2012-3986 represents a critical security flaw in Mozilla Firefox and related applications that persisted across multiple product lines including Thunderbird and SeaMonkey. This issue stems from inadequate restrictions within the DOMWindowUtils component, which serves as a crucial interface for web content to interact with browser window management functionality. The vulnerability specifically affects versions prior to Firefox 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey 2.13, indicating a widespread impact across the Mozilla ecosystem. The flaw allows malicious actors to exploit JavaScript code that can bypass intended access controls, potentially enabling unauthorized operations that should be restricted to privileged contexts. This represents a significant bypass of the browser's security model where legitimate access restrictions are circumvented through crafted script execution.
The technical implementation of this vulnerability involves the improper handling of DOMWindowUtils methods, which are part of the nsDOMWindowUtils interface in Mozilla's codebase. These methods typically provide access to various window management functions that should be restricted to prevent unauthorized access to browser internals. When the access controls are improperly enforced, attackers can construct JavaScript code that calls these methods with elevated privileges, effectively breaking down the security boundaries that separate user content from privileged browser operations. The flaw manifests when the browser fails to properly validate or restrict the execution context of these methods, allowing untrusted JavaScript to invoke functionality that should only be available to trusted browser components or privileged scripts.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with the capability to bypass fundamental security mechanisms that protect user data and system integrity. An attacker could potentially leverage this vulnerability to access restricted browser functionality, manipulate window properties, or gain access to information that should remain protected from web content. The implications are particularly severe in environments where users might encounter malicious web content, as the vulnerability could be exploited through phishing attacks, compromised websites, or malicious advertisements. This type of vulnerability directly impacts the browser's ability to maintain a secure sandbox environment, where web content is expected to operate within strict boundaries to prevent unauthorized access to system resources or user data.
Organizations and users affected by this vulnerability should implement immediate mitigations including upgrading to the patched versions of affected software, as the vendor released updates specifically addressing the DOMWindowUtils access restriction bypass. System administrators should prioritize deployment of these security patches across all affected installations, particularly in enterprise environments where multiple browser versions might be in use. Additionally, users should be educated about the importance of keeping their browser software up to date and should be aware of the risks associated with visiting untrusted websites. From a security framework perspective, this vulnerability aligns with CWE-284, which addresses improper access control, and could be categorized under ATT&CK technique T1059 for execution through scripting languages. The vulnerability demonstrates the critical importance of maintaining proper privilege separation in browser security models and highlights the need for continuous security auditing of interface components that provide access to privileged functionality.