CVE-2006-1273 in Firefox
Summary
by MITRE
** DISPUTED ** Mozilla Firefox 1.0.7 and 1.5.0.1 allows remote attackers to cause a denial of service (crash) via an HTML tag with a large number of script action handlers such as onload and onmouseover, which triggers the crash when the user views the page source. NOTE: Red Hat has disputed this issue, suggesting that "It is likely the reporter was running the IE Tab extension," and Mozilla also confirmed that this is not an issue in Firefox itself.
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability described in CVE-2006-1273 represents a disputed denial of service condition affecting Mozilla Firefox versions 1.0.7 and 1.5.0.1. This issue emerged from reports indicating that specific HTML constructs containing excessive script action handlers could trigger browser crashes when users attempted to view the page source. The technical nature of this vulnerability stems from Firefox's handling of HTML elements with numerous event handlers, particularly those related to user interaction such as onload and onmouseover attributes. When these elements are processed during source view operations, the browser's memory management and parsing mechanisms appear to become overwhelmed, leading to system instability and potential application termination.
The operational impact of this vulnerability, while limited in scope according to vendor assessments, demonstrates the potential for remote attackers to disrupt user sessions and create service interruptions through carefully crafted web content. The flaw specifically manifests when Firefox encounters HTML tags containing an excessive number of script action handlers, suggesting a parsing or memory allocation issue within the browser's HTML processing engine. This type of vulnerability falls under the category of resource exhaustion attacks, where malicious input causes the application to consume excessive system resources or trigger memory corruption conditions. The issue's classification aligns with CWE-400, which addresses unspecified resource exhaustion vulnerabilities, and represents a classic example of how malformed input can lead to application instability.
Industry standards and attack frameworks such as MITRE ATT&CK taxonomy would categorize this vulnerability within the privilege escalation and denial of service domains, specifically mapping to techniques involving resource exhaustion and application instability. The fact that both Red Hat and Mozilla have disputed this issue suggests that the vulnerability may have been misattributed or that the actual root cause lies elsewhere in the user's browsing environment. This dispute highlights the complexity of vulnerability analysis and the importance of thorough investigation before assigning blame to specific software components. The issue's disputed nature indicates that the problem may have been introduced by third-party extensions rather than Firefox itself, emphasizing the need for comprehensive testing across the entire browser ecosystem including add-ons and extensions that may interact with core browser functions. The vulnerability's resolution approach would typically involve either patching the browser's HTML parsing logic or implementing additional input validation measures to prevent excessive handler processing during source view operations.
The disputed nature of this CVE demonstrates the challenges faced by security researchers in accurately attributing vulnerabilities to specific software components, particularly when third-party extensions or user configurations may contribute to the observed behavior. This case underscores the importance of thorough investigation and the potential for false positives in vulnerability reporting, where the actual attack vector may be more complex than initially reported. Security professionals must consider the entire attack surface when evaluating such claims, including the possibility that browser extensions or user-specific configurations may be responsible for the observed instability. The vulnerability serves as a reminder that comprehensive testing environments are essential for accurate vulnerability assessment and that the interaction between multiple software components can create unexpected behaviors that complicate the identification of true root causes.