CVE-2007-0777 in Firefox
Summary
by MITRE
The JavaScript engine in Mozilla Firefox before 1.5.0.10 and 2.x before 2.0.0.2, Thunderbird before 1.5.0.10, and SeaMonkey before 1.0.8 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via certain vectors that trigger memory corruption.
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Analysis
by VulDB Data Team • 01/21/2025
The vulnerability identified as CVE-2007-0777 represents a critical memory corruption issue within the JavaScript engine of several Mozilla applications including Firefox, Thunderbird, and SeaMonkey. This flaw exists in versions prior to the specified patches and demonstrates the inherent risks associated with complex scripting engines that process untrusted web content. The vulnerability stems from improper memory management during JavaScript execution, creating conditions where maliciously crafted web pages could trigger buffer overflows or other memory corruption anomalies. Such issues are particularly dangerous because they can be exploited remotely through web browsers without requiring any special privileges from the victim, making them ideal candidates for widespread exploitation.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers stack-based buffer overflow scenarios. The flaw occurs when the JavaScript engine fails to properly validate memory allocations during script execution, particularly when handling complex JavaScript objects and arrays. Attackers can craft specific JavaScript code that, when executed by the vulnerable browser, causes the application to write beyond allocated memory boundaries. This memory corruption can manifest as application crashes or, in more sophisticated exploitation scenarios, allow attackers to execute arbitrary code with the privileges of the browser process. The vulnerability's remote exploitability means that simply visiting a malicious website could compromise a user's system.
The operational impact of CVE-2007-0777 extends beyond simple denial of service to potentially enable full system compromise. When the JavaScript engine crashes due to memory corruption, users experience unexpected browser termination which can lead to data loss and disruption of productivity. However, the more serious concern lies in the potential for remote code execution, which could allow attackers to install malware, steal sensitive information, or establish persistent access to compromised systems. The widespread adoption of affected Mozilla applications means that this vulnerability could impact millions of users globally, making it a high-priority security concern for organizations and individuals alike. The vulnerability affects multiple product lines from the same vendor, indicating a fundamental flaw in the JavaScript engine architecture that required patching across several applications.
Mitigation strategies for this vulnerability focus primarily on immediate patch deployment as recommended by Mozilla and security vendors. Organizations should prioritize updating all affected Mozilla applications to their patched versions, specifically Firefox 1.5.0.10 and 2.x 2.0.0.2, Thunderbird 1.5.0.10, and SeaMonkey 1.0.8. Additionally, security administrators should implement network-based protections such as web application firewalls and content filtering solutions that can detect and block malicious JavaScript payloads. Browser hardening techniques including disabling JavaScript for untrusted sites, implementing sandboxing mechanisms, and using security extensions can provide additional layers of defense. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and remote code execution through browser exploitation, making it relevant to TTPs related to initial access and execution phases of cyber attacks. Regular security assessments and vulnerability scanning should be implemented to identify any remaining unpatched systems within organizational networks, as this vulnerability represents a significant attack surface that could be leveraged for more advanced persistent threats.