CVE-2012-4209 in Firefox
Summary
by MITRE
Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 do not prevent use of a "top" frame name-attribute value to access the location property, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via vectors involving a binary plugin.
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Analysis
by VulDB Data Team • 10/22/2024
This vulnerability exists in multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey versions prior to their respective security updates. The flaw relates to improper handling of frame name attributes within web content, specifically when a frame is named "top" which allows attackers to manipulate the location property of the top-level browsing context. This represents a significant security weakness that undermines the browser's security model and creates opportunities for malicious actors to execute cross-site scripting attacks through carefully crafted web content.
The technical implementation of this vulnerability exploits the browser's frame naming mechanism where the "top" keyword serves as a special identifier for the top-level browsing context. When a malicious web page creates a frame with the name attribute set to "top", the browser's security restrictions are bypassed, allowing the frame to access and manipulate the location property of the parent window. This behavior violates the fundamental security principle that frames should not be able to directly access or modify the properties of their parent browsing context without proper authorization. The vulnerability specifically affects versions where the security controls around frame naming have not been properly enforced, creating a pathway for attackers to escalate privileges within the browser's security boundaries.
The operational impact of this vulnerability is severe as it enables remote attackers to conduct sophisticated cross-site scripting attacks that can bypass standard security mechanisms. Attackers can leverage this flaw to inject malicious scripts that can access sensitive information, perform unauthorized actions on behalf of users, or redirect users to malicious websites. The vulnerability is particularly dangerous because it can be exploited through binary plugins, which are often trusted components of the browser that have elevated privileges. This creates a multi-layered attack vector where attackers can combine the frame manipulation technique with plugin-based exploits to achieve more significant compromise. The vulnerability affects not just individual users but also organizations that rely on these browsers for secure web browsing operations.
Mitigation strategies should focus on immediate patching of affected versions to ensure that the frame name validation logic is properly enforced. Organizations should implement comprehensive browser update policies that ensure all users are running patched versions of these applications. Additionally, security teams should monitor for exploitation attempts through network traffic analysis and implement web application firewalls that can detect and block suspicious frame manipulation patterns. The vulnerability aligns with CWE-79 which addresses cross-site scripting flaws, and can be mapped to ATT&CK technique T1059.007 for script-based attacks. Regular security assessments should include testing for similar frame manipulation vulnerabilities, and browser hardening configurations should be implemented to further restrict frame access permissions. Organizations should also consider implementing content security policies that limit the ability of third-party content to manipulate frame hierarchies, thereby reducing the attack surface for this particular vulnerability class.