CVE-2009-3073 in Firefox
Summary
by MITRE
Unspecified vulnerability in the JavaScript engine in Mozilla Firefox 3.5.x before 3.5.3 allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.
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Analysis
by VulDB Data Team • 08/22/2021
The vulnerability identified as CVE-2009-3073 represents a critical security flaw within the JavaScript engine of Mozilla Firefox versions 3.5.x prior to 3.5.3. This unspecified weakness resides in the core rendering engine responsible for executing JavaScript code within the browser environment, making it a prime target for exploitation by malicious actors seeking to compromise user systems. The vulnerability manifests as a memory corruption issue that can be triggered through specially crafted web content, potentially leading to system instability and unauthorized code execution. The affected JavaScript engine component is fundamental to Firefox's web browsing capabilities, as it processes dynamic content and interactive elements that users encounter on modern websites.
The technical nature of this vulnerability stems from improper handling of JavaScript objects and memory management within the browser's execution environment. Attackers can exploit this flaw by delivering malicious web content that triggers specific code paths within the JavaScript engine, causing memory corruption that results in application crashes or more severe consequences. The memory corruption occurs during the processing of JavaScript code, where the engine fails to properly validate or manage memory allocations, leading to potential buffer overflows or heap corruption. This type of vulnerability falls under the category of memory safety issues that are particularly dangerous in browser environments where untrusted code execution is common. The attack vector typically involves visiting a compromised website or receiving malicious content through web-based communication channels that contain crafted JavaScript code designed to exploit the specific memory handling flaw.
The operational impact of CVE-2009-3073 extends beyond simple denial of service conditions to potentially enable remote code execution, making it a significant threat to user security and system integrity. When exploited successfully, this vulnerability allows attackers to execute arbitrary code with the privileges of the victim's browser process, potentially leading to full system compromise. The memory corruption can cause unpredictable behavior including application crashes, system instability, and in severe cases, complete system compromise. Users running vulnerable versions of Firefox face substantial risk when browsing the internet, as the attack surface is broad and the exploitation can occur through legitimate web browsing activities. The vulnerability's impact is particularly concerning because it affects the core browser functionality that millions of users rely on daily, making it a high-priority target for exploitation by threat actors.
Security professionals should prioritize immediate patching of all Firefox installations running versions 3.5.x before 3.5.3 to mitigate this vulnerability. The recommended mitigation strategy involves upgrading to Firefox 3.5.3 or later versions that contain the necessary fixes for the JavaScript engine memory handling issues. Organizations should implement comprehensive patch management procedures to ensure all systems are updated promptly, as the vulnerability can be exploited through various attack vectors including malicious websites, email attachments, and social engineering campaigns. Additional defensive measures include implementing web filtering solutions, disabling JavaScript in less trusted environments, and monitoring for suspicious network activity that might indicate exploitation attempts. This vulnerability aligns with CWE-119, which addresses memory safety issues and improper handling of memory resources, and corresponds to ATT&CK technique T1059.007 for JavaScript execution, highlighting the importance of browser security hardening and proper input validation in preventing such exploits from succeeding.