CVE-2012-4180 in Firefox
Summary
by MITRE
Heap-based buffer overflow in the nsHTMLEditor::IsPrevCharInNodeWhitespace function in 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 allows remote attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2012-4180 represents a critical heap-based buffer overflow affecting multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey. This flaw exists within the nsHTMLEditor::IsPrevCharInNodeWhitespace function, which handles HTML editing operations in the browser's rendering engine. The vulnerability manifests when processing malformed HTML content that triggers memory corruption during whitespace character detection operations, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on affected systems.
The technical implementation of this buffer overflow stems from inadequate bounds checking within the HTML editor's whitespace detection logic. When the nsHTMLEditor component processes HTML content containing specially crafted sequences, the IsPrevCharInNodeWhitespace function fails to properly validate the size of memory allocations or the bounds of buffer operations. This allows attackers to write data beyond the allocated heap memory boundaries, potentially overwriting adjacent memory structures including function pointers, return addresses, or other critical program data. The vulnerability's exploitation requires remote code execution capabilities through web-based attacks, making it particularly dangerous in browser environments where users frequently encounter untrusted content.
The operational impact of CVE-2012-4180 extends beyond simple code execution, as it enables attackers to bypass modern security mitigations including address space layout randomization and data execution prevention mechanisms. Attackers can leverage this vulnerability to perform privilege escalation, install malware, steal sensitive information, or establish persistent backdoors on compromised systems. The affected product versions include widely deployed browser applications that were commonly used for web browsing and email operations, making the attack surface substantial and the potential for widespread exploitation significant. Security researchers have classified this vulnerability as high-risk due to its remote exploitability and the ability to execute arbitrary code without user interaction in many scenarios.
Mitigation strategies for CVE-2012-4180 primarily focus on immediate software updates and patches provided by Mozilla. Organizations should prioritize upgrading to Firefox 16.0, Thunderbird 16.0, or their respective ESR versions that contain the fixed implementation of the nsHTMLEditor component. Additionally, implementing network-based security controls including web application firewalls and content filtering systems can help reduce the risk of exploitation by blocking malicious HTML content. Security administrators should also consider deploying exploit prevention technologies such as heap protection mechanisms and stack canaries to detect and prevent memory corruption attacks. The vulnerability aligns with CWE-121 heap-based buffer overflow classification and corresponds to attack techniques documented in the MITRE ATT&CK framework under code injection and memory corruption categories, emphasizing the need for comprehensive defensive measures across multiple security layers.