CVE-2008-5016 in Firefox
Summary
by MITRE
The layout engine in Mozilla Firefox 3.x before 3.0.4, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) via multiple vectors that trigger an assertion failure or other consequences.
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Analysis
by VulDB Data Team • 08/20/2019
The vulnerability identified as CVE-2008-5016 represents a critical denial of service flaw affecting multiple Mozilla products including Firefox 3.x versions prior to 3.0.4, Thunderbird 2.x versions before 2.0.0.18, and SeaMonkey 1.x versions before 1.1.13. This issue resides within the layout engine component that is responsible for rendering web content and handling document structures. The vulnerability stems from insufficient input validation and error handling mechanisms within the rendering engine's processing of malformed or specially crafted content. Attackers can exploit this weakness by delivering malicious content that triggers assertion failures or other internal engine errors, causing the affected applications to crash and become unavailable to users. The technical nature of this flaw falls under CWE-129, which addresses improper validation of array indices, and CWE-248, which covers exposure of unintended error handling paths. The vulnerability demonstrates characteristics consistent with the ATT&CK technique T1499.004, specifically network denial of service attacks that target application stability and availability.
The operational impact of this vulnerability extends beyond simple application crashes to potentially disrupt user productivity and system availability. When exploited, the denial of service condition can occur through various attack vectors including web page content, email messages, or other data sources that the affected applications process. The assertion failures that trigger this vulnerability typically manifest as unexpected program termination, which can occur during normal browsing or email reading activities. This makes the vulnerability particularly dangerous as it can be triggered by seemingly benign content that users would encounter in regular web browsing or email operations. The vulnerability's presence in multiple Mozilla products indicates a systemic issue within the shared layout engine codebase, suggesting that similar flaws may exist in other components that share similar architectural patterns. Security researchers have noted that such assertion failures often indicate deeper memory management or input validation issues that could potentially be chained with other vulnerabilities to create more severe exploits.
Mitigation strategies for CVE-2008-5016 primarily focus on immediate software updates and patches provided by Mozilla. Organizations should prioritize updating all affected versions to their patched releases, which include Firefox 3.0.4, Thunderbird 2.0.0.18, and SeaMonkey 1.1.13. System administrators should implement automated patch management processes to ensure timely deployment of security updates across all endpoints. Network administrators can implement additional protective measures such as web content filtering and email scanning to prevent potentially malicious content from reaching user systems. The vulnerability highlights the importance of robust input validation and error handling practices in software development, particularly for components that process untrusted data. Security teams should monitor for similar patterns in other software components and consider implementing intrusion detection systems that can identify unusual crash patterns or assertion failures that might indicate exploitation attempts. Organizations should also review their incident response procedures to ensure they can effectively respond to denial of service incidents that could impact business operations. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software and the potential consequences of running outdated applications in enterprise environments.