CVE-2011-2378 in Firefox
Summary
by MITRE
The appendChild function in Mozilla Firefox before 3.6.20, Thunderbird 3.x before 3.1.12, SeaMonkey 2.x, and possibly other products does not properly handle DOM objects, which allows remote attackers to execute arbitrary code via unspecified vectors that lead to dereferencing of a "dangling pointer."
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Analysis
by VulDB Data Team • 11/18/2021
The vulnerability identified as CVE-2011-2378 represents a critical memory safety issue affecting Mozilla Firefox versions prior to 3.6.20, Thunderbird 3.x versions before 3.1.12, and SeaMonkey 2.x products. This flaw exists within the appendChild function implementation which is a fundamental DOM manipulation method used extensively throughout web applications. The vulnerability stems from improper handling of DOM objects during the appendChild operation, creating conditions where memory management becomes compromised. Security researchers have classified this as a dangling pointer dereference vulnerability, where a program attempts to access memory that has already been freed or reallocated, leading to unpredictable behavior and potential code execution.
The technical exploitation of this vulnerability occurs when remote attackers craft malicious web content that triggers the problematic appendChild function with specially constructed DOM objects. When the browser processes these objects, the improper memory handling causes the dangling pointer to be dereferenced, potentially allowing attackers to execute arbitrary code with the privileges of the victim's browser session. This type of vulnerability falls under CWE-466, which specifically addresses the issue of "Return of Pointer Value Outside of Expected Range" and aligns with ATT&CK technique T1059.007 for script-based execution. The flaw demonstrates how seemingly benign DOM manipulation operations can become attack vectors when memory management is not properly enforced, particularly in complex browser environments where multiple JavaScript contexts interact with native DOM objects.
The operational impact of this vulnerability extends beyond simple code execution, as it represents a complete compromise of browser security boundaries. Attackers can leverage this flaw to bypass security restrictions, access sensitive user data, perform cross-site scripting attacks, and potentially escalate privileges to gain control over the victim's system. The widespread adoption of affected browser versions means that this vulnerability could impact millions of users simultaneously, making it particularly dangerous in enterprise environments where browser security is paramount. Organizations using these vulnerable versions face significant risk of data breaches, credential theft, and malware deployment through drive-by download attacks that exploit this memory corruption vulnerability.
Mitigation strategies for CVE-2011-2378 primarily focus on immediate software updates and patches provided by Mozilla. Organizations should prioritize updating all affected browser installations to versions containing the necessary security fixes, with Firefox 3.6.20, Thunderbird 3.1.12, and SeaMonkey 2.1.12 being the minimum recommended versions. Additional protective measures include implementing strict content filtering, deploying web application firewalls, and utilizing sandboxing technologies to limit the potential impact of successful exploitation attempts. Security administrators should also consider deploying automated patch management systems to ensure rapid deployment of security updates across enterprise environments. The vulnerability highlights the importance of regular security assessments and maintaining up-to-date software inventory to prevent exploitation of known memory safety issues that could otherwise remain undetected for extended periods.