CVE-2008-7244 in Firefox
Summary
by MITRE
Mozilla Firefox 3.0.1 and earlier allows remote attackers to cause a denial of service (browser hang) by calling the window.print function in a loop, aka a "printing DoS attack," possibly a related issue to CVE-2009-0821.
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Analysis
by VulDB Data Team • 02/21/2025
This vulnerability represents a classic denial of service flaw in Mozilla Firefox versions 3.0.1 and earlier, where malicious actors can exploit the window.print function to create an infinite loop that consumes excessive system resources and ultimately causes the browser to hang or become unresponsive. The attack vector specifically targets the print functionality through JavaScript execution, leveraging the browser's handling of the window.print() method to create a continuous loop that prevents normal operation. This type of vulnerability falls under the category of resource exhaustion attacks that can be classified as a CWE-400 vulnerability, specifically related to uncontrolled resource consumption. The flaw demonstrates how seemingly benign browser features can be weaponized to disrupt user experience and system functionality.
The technical implementation of this attack involves executing JavaScript code that repeatedly calls the window.print function in a loop, creating an infinite execution path that consumes CPU cycles and memory resources. When the browser processes these repeated print commands, it attempts to prepare print dialogs and handle print operations continuously, leading to resource depletion and eventual browser freeze. This behavior creates a condition where the browser's main thread becomes blocked, preventing any further user interaction or normal processing of web content. The vulnerability is particularly concerning because it can be triggered through standard web page execution without requiring special privileges or complex exploitation techniques, making it accessible to a wide range of attackers.
From an operational impact perspective, this vulnerability enables attackers to disrupt user productivity and system availability by causing browser hangs that require manual intervention to resolve. Users may experience complete loss of browser functionality until the process is manually terminated or the system is rebooted, creating significant operational disruption in environments where browser stability is critical. The attack can be easily deployed through malicious web pages that automatically execute the problematic JavaScript code upon page load, making it particularly dangerous in phishing campaigns or compromised websites. This vulnerability can be classified under the ATT&CK technique T1499.004 for network denial of service, specifically targeting application availability through browser-based attacks. The impact extends beyond individual users to potentially affect enterprise environments where multiple users may be simultaneously affected by a single malicious page.
The mitigation strategies for this vulnerability include updating to Firefox versions 3.0.2 and later, where Mozilla implemented fixes to prevent infinite loops in print function handling. Browser vendors should implement proper timeout mechanisms and resource limits for print operations to prevent excessive consumption of system resources. Additionally, implementing content security policies and sandboxing mechanisms can help contain the impact of such attacks by limiting the damage that malicious scripts can cause to browser processes. Organizations should also consider deploying network-level protections and web filtering solutions that can detect and block suspicious print-related JavaScript patterns. The vulnerability highlights the importance of proper input validation and resource management in browser implementations, reinforcing the need for comprehensive security testing of core browser functionality to prevent similar issues in future releases.