CVE-2012-4182 in Firefox
Summary
by MITRE
Use-after-free vulnerability in the nsTextEditRules::WillInsert 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 or cause a denial of service (heap memory corruption) via unspecified vectors.
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Analysis
by VulDB Data Team • 10/22/2024
The CVE-2012-4182 vulnerability represents a critical use-after-free flaw within Mozilla's browser and email client software ecosystems, specifically targeting the nsTextEditRules::WillInsert function in versions prior to 16.0 for Firefox and Thunderbird, and 2.13 for SeaMonkey. This vulnerability stems from improper memory management practices where freed memory locations are accessed after being deallocated, creating opportunities for malicious exploitation. The flaw affects multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey across their respective stable and extended support release channels, indicating a widespread impact across the organization's software portfolio.
The technical implementation of this vulnerability occurs within the nsTextEditRules::WillInsert function, which handles text editing operations in the browser's rendering engine. When processing certain text insertion operations, the function fails to properly manage memory references, leading to a situation where freed memory blocks are accessed by subsequent operations. This use-after-free condition creates heap memory corruption that can be leveraged by remote attackers to execute arbitrary code with the privileges of the affected application. The vulnerability's exploitation potential is heightened by the fact that it can be triggered through unspecified vectors, suggesting that attackers may be able to craft malicious web content or email messages that induce the vulnerable code path during normal user operations.
The operational impact of CVE-2012-4182 extends beyond simple denial of service scenarios to encompass full remote code execution capabilities. Attackers exploiting this vulnerability could potentially gain complete control over affected systems, making it particularly dangerous in enterprise environments where users may access untrusted web content or email messages. The heap memory corruption resulting from the use-after-free condition can be manipulated to overwrite critical memory locations, potentially redirecting program execution flow or injecting malicious code into the target process. This makes the vulnerability particularly attractive to threat actors seeking to establish persistent access or escalate privileges within compromised systems.
From a cybersecurity perspective, this vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in memory management, and represents a classic example of how improper resource handling can lead to severe security implications. The ATT&CK framework categorizes this type of vulnerability under the T1059.007 technique for "Command and Scripting Interpreter: PowerShell" when considering the potential for code execution, though the actual exploitation path would typically involve browser-based attack vectors. Organizations affected by this vulnerability should prioritize immediate patch deployment across all affected versions, implementing network segmentation to limit exposure, and monitoring for potential exploitation attempts. The vulnerability's presence across multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey underscores the importance of comprehensive vulnerability management programs that address the full software ecosystem rather than individual applications in isolation.
The remediation approach for CVE-2012-4182 requires organizations to upgrade to patched versions of affected Mozilla products, specifically Firefox 16.0, Thunderbird 16.0, and SeaMonkey 2.13, along with their respective extended support releases. Security teams should implement automated patch management processes to ensure timely deployment of security updates across all endpoints. Additionally, organizations should consider implementing browser hardening measures, such as disabling unnecessary JavaScript functionality, implementing content security policies, and deploying web application firewalls to reduce the attack surface. The vulnerability demonstrates the critical importance of maintaining current security patches and highlights the need for continuous monitoring of security advisories from software vendors to prevent exploitation of known vulnerabilities.