CVE-2012-5830 in Firefox
Summary
by MITRE
Use-after-free vulnerability 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 on Mac OS X allows remote attackers to execute arbitrary code via an HTML document.
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Analysis
by VulDB Data Team • 04/19/2021
The CVE-2012-5830 vulnerability represents a critical use-after-free flaw in Mozilla's flagship browser applications that affected multiple products including Firefox, Thunderbird, and SeaMonkey across various versions. This vulnerability specifically targeted Mac OS X systems and created a remote code execution vector that could be exploited by attackers through malicious HTML documents. The flaw emerged from improper memory management practices within the browser's rendering engine, where freed memory blocks were still being referenced by subsequent operations. The vulnerability was classified under CWE-416 as a use-after-free condition, which occurs when a program continues to reference memory after it has been freed, leading to unpredictable behavior and potential exploitation opportunities.
The technical exploitation of this vulnerability involved crafting malicious HTML content that would trigger specific memory allocation and deallocation sequences within the browser's JavaScript engine. When the browser processed such content, it would allocate memory for certain objects, perform operations that caused those objects to be freed, and then attempt to access the freed memory locations. This memory corruption could be leveraged to overwrite critical program structures or inject malicious code into the browser process. The attack vector was particularly dangerous because it required no user interaction beyond visiting a malicious website, making it a prime candidate for drive-by download attacks that could compromise systems without user awareness. The vulnerability demonstrated how complex memory management in modern browsers could create exploitable conditions that bypassed traditional security mechanisms.
The operational impact of this vulnerability was severe as it allowed remote attackers to execute arbitrary code with the privileges of the affected browser process, potentially leading to full system compromise. Attackers could leverage this vulnerability to install malware, steal sensitive data, or establish persistent backdoors on victim systems. The widespread adoption of Firefox and Thunderbird made this vulnerability particularly dangerous, as it could affect a large user base across different organizations and individual users. The vulnerability also highlighted the challenges of maintaining memory safety in complex software applications and demonstrated how seemingly minor memory management issues could create significant security risks. Organizations using affected versions of these applications faced potential exposure to sophisticated attacks that could bypass traditional network security controls.
Mitigation strategies for CVE-2012-5830 primarily focused on immediate software updates and patches provided by Mozilla to address the underlying memory management issues. Security administrators were advised to deploy patches as soon as possible, as the vulnerability was actively exploited in the wild. Additional mitigations included implementing browser hardening techniques such as address space layout randomization and stack canaries, though these were secondary measures to the primary patching approach. The vulnerability also underscored the importance of regular security updates and the need for organizations to maintain comprehensive patch management processes. From an operational security perspective, this vulnerability reinforced the necessity of monitoring threat intelligence feeds and maintaining awareness of emerging exploits targeting widely used software applications. The incident highlighted the critical role of automated vulnerability scanning and the importance of maintaining up-to-date security configurations across all enterprise systems.