CVE-2008-2014 in Firefox
Summary
by MITRE
Mozilla Firefox 3.0 beta 5 allows remote attackers to cause a denial of service (application crash) via JavaScript code that calls document.write in an infinite loop.
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Analysis
by VulDB Data Team • 09/23/2018
The vulnerability identified as CVE-2008-2014 represents a classic denial of service flaw within the Mozilla Firefox web browser version 3.0 beta 5. This issue arises from improper handling of JavaScript execution within the browser's rendering engine, specifically when processing document.write operations in an infinite loop scenario. The vulnerability demonstrates how seemingly benign scripting operations can be exploited to disrupt normal browser functionality and potentially impact user experience and system stability.
The technical flaw manifests when JavaScript code executes document.write calls within an infinite loop structure, causing the browser to consume excessive system resources and ultimately crash. This behavior stems from the browser's inability to properly detect and terminate infinite execution loops, leading to uncontrolled memory consumption and processor utilization. The vulnerability falls under the category of resource exhaustion attacks where malicious actors can leverage JavaScript to exhaust available system resources, resulting in application instability and potential system-wide impact.
From an operational perspective, this vulnerability poses significant risks to users who may encounter unexpected browser crashes when visiting compromised websites or interacting with malicious content. The attack vector requires remote code execution through web content, making it particularly dangerous in environments where users frequently browse untrusted websites. Security professionals must consider this vulnerability as part of broader browser security assessments, particularly in enterprise environments where browser stability directly impacts productivity and security posture.
The vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption" in software systems, and demonstrates how improper input validation and resource management can lead to denial of service conditions. From an ATT&CK framework perspective, this vulnerability maps to techniques involving process injection and resource exhaustion, potentially enabling attackers to disrupt normal system operations and create conditions for more sophisticated attacks.
Mitigation strategies for CVE-2008-2014 include immediate deployment of security patches provided by Mozilla, implementation of browser security policies that limit JavaScript execution, and network-level controls that can detect and block suspicious JavaScript patterns. Organizations should also consider implementing web application firewalls and browser hardening measures to reduce the attack surface. Regular security updates and monitoring of browser behavior can help identify potential exploitation attempts and prevent unauthorized access to system resources.
The broader implications of this vulnerability highlight the importance of robust input validation and resource management in web browser architectures. Modern browser security implementations have evolved significantly since 2008, incorporating more sophisticated mechanisms for detecting and preventing infinite loop scenarios, memory exhaustion attacks, and other resource-based vulnerabilities. This case study serves as a reminder of the critical need for continuous security improvements in web browser development and the importance of timely patch management across all system components.