CVE-2012-4214 in Firefox
Summary
by MITRE
Use-after-free vulnerability in the nsTextEditorState::PrepareEditor function in 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 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors, a different vulnerability than CVE-2012-5840.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2012-4214 represents a critical use-after-free condition within Mozilla Firefox's text editing subsystem, specifically affecting the nsTextEditorState::PrepareEditor function. This flaw exists in multiple Mozilla products including Firefox versions prior to 17.0, Firefox ESR 10.x versions before 10.0.11, Thunderbird versions before 17.0, Thunderbird ESR 10.x versions before 10.0.11, and SeaMonkey versions before 2.14. The vulnerability stems from improper memory management where freed memory locations are accessed after being deallocated, creating opportunities for malicious exploitation.
The technical nature of this vulnerability aligns with CWE-416, which describes the use of freed memory condition, and represents a classic heap-based memory corruption issue. When the nsTextEditorState::PrepareEditor function processes text editing operations, it fails to properly validate or manage memory references, allowing an attacker to manipulate the freed memory space. This particular implementation flaw occurs during text editor state preparation, where the application allocates memory for text processing operations and subsequently frees it, but fails to nullify pointers or properly track the memory lifecycle. The vulnerability enables attackers to control the execution flow by placing malicious data in the freed memory regions, potentially leading to arbitrary code execution.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it can be exploited remotely to achieve complete system compromise. Attackers can craft malicious web content that, when processed by the vulnerable browser, triggers the use-after-free condition in the text editor component. This exploitation vector allows for heap memory corruption that can be leveraged to execute arbitrary code with the privileges of the affected application. The vulnerability's remote exploitability makes it particularly dangerous in web browsing environments where users frequently encounter untrusted content. The specific nature of the flaw means that successful exploitation could result in full system compromise, data theft, or persistent backdoor installation, making it a significant threat to user security.
Mitigation strategies for CVE-2012-4214 primarily focus on immediate patch deployment and system hardening measures. Organizations should prioritize updating all affected Mozilla products to their patched versions, as the vulnerability affects multiple products in the Mozilla ecosystem. System administrators should implement network-based protections such as web application firewalls and content filtering to reduce exposure to malicious content. Browser security configurations should be enhanced through the implementation of sandboxing technologies and privilege separation mechanisms. Additionally, security monitoring should include detection of anomalous memory access patterns and heap corruption indicators. The vulnerability's classification under the ATT&CK framework as a memory corruption technique emphasizes the importance of memory safety controls and regular security assessments. Organizations should also consider implementing security awareness training to reduce the risk of social engineering attacks that could leverage this vulnerability, as users may inadvertently encounter malicious content that triggers the exploit.