CVE-2007-5341 in Firefox
Summary
by MITRE
Remote code execution in the Venkman script debugger in Mozilla Firefox before 2.0.0.8.
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Analysis
by VulDB Data Team • 11/08/2019
The vulnerability identified as CVE-2007-5341 represents a critical remote code execution flaw within the Venkman script debugger component of Mozilla Firefox versions prior to 2.0.0.8. This vulnerability specifically targets the debugging functionality that allows developers to inspect and debug javascript code within the browser environment. The Venkman debugger, while intended to aid in web development, became a vector for malicious actors to execute arbitrary code on affected systems. The flaw exists in how the debugger component processes certain input parameters during script evaluation, creating an opportunity for attackers to inject and execute malicious javascript code remotely.
The technical implementation of this vulnerability stems from improper input validation and sanitization within the Venkman debugger's script execution engine. When Firefox processes javascript code through the debugger interface, it fails to adequately validate the input parameters passed to the debugging functions. This allows an attacker to craft malicious script payloads that exploit buffer overflows or injection flaws in the debugger's processing logic. The vulnerability manifests when the debugger attempts to evaluate crafted javascript code that contains malicious payloads, leading to arbitrary code execution with the privileges of the browser process. This issue falls under the CWE-121 category of stack-based buffer overflow, though it more accurately represents a more complex injection vulnerability that leverages the debugger's trust model.
The operational impact of this vulnerability extends beyond simple remote code execution, as it enables attackers to completely compromise affected Firefox installations. Once exploited, the malicious code can perform actions such as downloading and installing additional malware, modifying browser settings, stealing user credentials, or accessing sensitive data stored within the browser. The vulnerability is particularly dangerous because it affects the browser's debugging infrastructure, which is typically trusted by users and developers. Attackers can leverage this flaw through various attack vectors including malicious websites, phishing emails, or compromised web applications that prompt users to execute the vulnerable debugger functionality. The attack surface is broad since the Venkman debugger is enabled by default in many Firefox configurations, making the exploit viable against a significant portion of the user base.
Security professionals should implement immediate mitigations including upgrading to Firefox version 2.0.0.8 or later, which contains patches addressing the input validation issues in the Venkman debugger. Organizations should also consider disabling the Venkman debugger in enterprise environments where it is not required for development purposes. Network administrators can implement web filtering solutions to block access to known malicious domains that might exploit this vulnerability. The ATT&CK framework categorizes this vulnerability under T1059.007 for scripting and T1566 for spearphishing with a link, as attackers would likely use these techniques to deliver the malicious payloads. Additionally, the vulnerability demonstrates the importance of input validation and the principle of least privilege in browser security architecture, where debugging components should not have elevated privileges that could be exploited by malicious actors. Regular security assessments and vulnerability scanning should include checks for outdated browser versions and unnecessary debugging components to prevent exploitation of similar flaws in the broader Firefox ecosystem.