CVE-2009-3077 in Firefox
Summary
by MITRE
Mozilla Firefox before 3.0.14, and 3.5.x before 3.5.3, does not properly manage pointers for the columns (aka TreeColumns) of a XUL tree element, which allows remote attackers to execute arbitrary code via a crafted HTML document, related to a "dangling pointer vulnerability."
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Analysis
by VulDB Data Team • 08/22/2021
The vulnerability identified as CVE-2009-3077 represents a critical dangling pointer flaw within Mozilla Firefox browser versions prior to 3.0.14 and 3.5.x versions before 3.5.3. This issue specifically affects the handling of XUL tree elements and their column management mechanisms, creating a scenario where memory references become invalid while still being accessible to malicious code. The flaw manifests when the browser processes HTML documents containing crafted XUL tree structures with multiple columns, leading to improper pointer management that can be exploited by remote attackers. The vulnerability operates at the intersection of memory management and web rendering, exploiting the browser's internal handling of dynamic data structures that represent tabular data in user interfaces. This particular implementation flaw allows attackers to manipulate memory pointers in a way that can lead to code execution, making it particularly dangerous in web browsing contexts where users may encounter malicious content without explicit interaction.
The technical exploitation of this vulnerability involves creating a malicious HTML document that triggers the specific conditions leading to the dangling pointer state. When Firefox processes a XUL tree element with multiple columns, the browser maintains internal pointer references to track column information and their associated data. The flaw occurs during the lifecycle management of these pointers, specifically when columns are added, removed, or modified in ways that leave stale references in memory. Attackers can craft HTML content that forces the browser to perform operations on these invalid memory locations, potentially allowing them to execute arbitrary code with the privileges of the browser process. This type of vulnerability falls under the category of memory corruption flaws, which are particularly dangerous because they can bypass many traditional security mechanisms and provide direct access to system resources. The vulnerability demonstrates poor memory management practices in the browser's rendering engine and represents a failure in proper pointer validation and cleanup procedures.
The operational impact of CVE-2009-3077 extends beyond simple code execution capabilities to encompass significant security risks for users of affected Firefox versions. Remote attackers can leverage this vulnerability through various attack vectors including malicious websites, email attachments, or compromised web services that deliver the crafted HTML content. The exploitation requires no user interaction beyond visiting a malicious webpage, making it particularly dangerous in phishing campaigns or drive-by download scenarios. Once successfully exploited, attackers gain the ability to execute arbitrary code on the victim's system with the privileges of the Firefox process, potentially leading to full system compromise. The vulnerability affects a wide range of users since XUL tree elements are commonly used in Firefox extensions, web applications, and browser interfaces, making the attack surface broad and difficult to predict. This flaw can be particularly problematic in enterprise environments where users may encounter untrusted content and where the browser's memory management becomes a critical security control point.
Mitigation strategies for CVE-2009-3077 focus primarily on updating to patched versions of Firefox where the dangling pointer handling has been corrected. Users should immediately upgrade to Firefox 3.0.14 or 3.5.3 and later versions that contain the necessary memory management fixes. Browser vendors and security teams recommend implementing additional protective measures such as disabling XUL tree elements in untrusted contexts, using security-focused browser configurations, and employing content filtering systems that can detect and block malicious HTML content. The vulnerability highlights the importance of proper memory management in browser engines and underscores the need for regular security updates. Organizations should also consider implementing network-level protections and monitoring for exploitation attempts, as the vulnerability can be detected through unusual memory access patterns or browser behavior. This particular flaw serves as a reminder of the critical importance of secure coding practices in browser development and the need for comprehensive testing of memory management scenarios in complex web applications.
This vulnerability is classified as a CWE-469: Use of Pointer Subtraction to Determine Size, which relates to improper pointer arithmetic and memory management. The attack pattern aligns with ATT&CK technique T1059.007: Command and Scripting Interpreter: JavaScript, as the exploitation typically occurs through JavaScript execution within the browser context. The memory corruption nature of this vulnerability places it within the broader category of heap-based buffer overflows and pointer-related security flaws that have historically been among the most exploited classes of vulnerabilities in web browsers. The issue demonstrates how seemingly minor implementation details in browser rendering engines can create significant security risks that can be leveraged for complete system compromise.