CVE-2007-5339 in Firefox
Summary
by MITRE
Multiple vulnerabilities in Mozilla Firefox before 2.0.0.8, Thunderbird before 2.0.0.8, and SeaMonkey before 1.1.5 allow remote attackers to cause a denial of service (crash) via crafted HTML that triggers memory corruption or assert errors.
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Analysis
by VulDB Data Team • 01/11/2025
The vulnerability described in CVE-2007-5339 represents a critical class of memory corruption flaws affecting major web browsers and email clients in the Mozilla ecosystem. This vulnerability impacts Firefox versions prior to 2.0.0.8, Thunderbird versions prior to 2.0.0.8, and SeaMonkey versions prior to 1.1.5, demonstrating the widespread nature of the issue across multiple Mozilla products. The flaw manifests when these applications process specially crafted HTML content that triggers memory corruption or assertion errors, leading to application instability and potential system crashes. From a cybersecurity perspective, this vulnerability exemplifies the dangerous category of heap-based buffer overflows and memory management errors that have historically been exploited for remote code execution attacks, though in this specific case the impact is limited to denial of service conditions.
The technical nature of this vulnerability aligns with CWE-122, which describes heap-based buffer overflow conditions where insufficient memory allocation or improper memory handling leads to corruption of adjacent memory locations. The flaw occurs during HTML parsing and rendering operations when the browser encounters malformed or maliciously constructed HTML elements that cause the application's memory management system to fail. When processing such content, the browser's JavaScript engine or rendering components may attempt to access memory locations that have been freed or improperly allocated, resulting in assertion failures that terminate the application process. This type of vulnerability is particularly dangerous because it can be triggered remotely through web pages or email content, making it a prime target for social engineering attacks that could compromise user productivity and system availability.
The operational impact of CVE-2007-5339 extends beyond simple application crashes to potentially disrupt business operations and user workflows across organizations relying on these browser and email clients. Security researchers categorize this vulnerability under the attack pattern known as T1499.004 in the MITRE ATT&CK framework, which covers "Domain Policy Violation" and "Resource Hijacking" through denial of service mechanisms. Organizations using affected versions of these Mozilla products face significant risk of service disruption, as users could be forced to restart applications repeatedly when encountering malicious content. The vulnerability also represents a potential stepping stone for more sophisticated attacks, as attackers could use the denial of service capability to mask other malicious activities or create conditions that make legitimate system monitoring more difficult.
Mitigation strategies for this vulnerability require immediate patch deployment across all affected systems, as the flaw represents a critical security risk that cannot be effectively addressed through configuration changes alone. System administrators should prioritize updating Firefox, Thunderbird, and SeaMonkey to their patched versions, which include memory safety improvements and enhanced input validation mechanisms. Additional protective measures include implementing web filtering solutions that can block suspicious HTML content, configuring email clients with strict attachment handling policies, and deploying network-based intrusion detection systems that can identify attempts to exploit this vulnerability. Security teams should also consider implementing user education programs to reduce the likelihood of users inadvertently encountering malicious content that could trigger this vulnerability, particularly in environments where users may be exposed to untrusted web content or email communications.