CVE-2013-1306 in Internet Explorer
Summary
by MITRE
Use-after-free vulnerability in Microsoft Internet Explorer 9 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to a deleted object, aka "Internet Explorer Use After Free Vulnerability," a different vulnerability than CVE-2013-1313.
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Analysis
by VulDB Data Team • 05/12/2025
The vulnerability identified as CVE-2013-1306 represents a critical use-after-free flaw in Microsoft Internet Explorer 9 that enables remote code execution through malicious web content. This vulnerability falls under the broader category of memory corruption issues that have long plagued web browsers and operating systems. The flaw specifically affects Internet Explorer 9 versions running on Windows operating systems, making it particularly dangerous given the widespread adoption of this browser version during the affected period. The vulnerability is classified as a use-after-free condition where an application continues to reference memory that has already been freed, creating a potential exploitation vector for attackers. This particular weakness allows adversaries to craft malicious websites that can trigger the execution of arbitrary code on vulnerable systems, effectively bypassing traditional security measures.
The technical implementation of this vulnerability involves the exploitation of improper memory management within Internet Explorer's rendering engine. When processing certain web content, the browser allocates memory for objects and subsequently frees that memory when it is no longer needed. However, a flaw exists in the memory management logic that allows attackers to manipulate the browser into accessing memory locations that have already been deallocated. This creates a scenario where attacker-controlled data can be placed in the freed memory space, and when the browser attempts to access this memory, it executes the malicious code embedded within the reclaimed memory area. The vulnerability is particularly insidious because it operates at the intersection of browser rendering and memory management, leveraging the complex interaction between JavaScript execution and native code processing within the browser environment. This type of vulnerability is categorized under CWE-416 as "Use After Free" and aligns with the broader ATT&CK technique T1059.007 for "Command and Scripting Interpreter: JavaScript" when used in malicious contexts.
The operational impact of CVE-2013-1306 extends far beyond simple browser compromise, as successful exploitation can lead to complete system compromise and persistent access for threat actors. Attackers can leverage this vulnerability to install backdoors, steal sensitive data, or establish command and control channels without requiring user interaction beyond visiting a malicious website. The vulnerability's remote exploitation capability means that attackers can target users globally without needing physical access to the victim's system. Organizations running Internet Explorer 9 were particularly vulnerable since this browser version was widely deployed in enterprise environments, making the attack surface extremely broad. The exploitation process typically involves crafting a web page that triggers the specific memory condition, often through complex JavaScript manipulation that forces the browser to access freed memory. This vulnerability demonstrates the critical importance of memory safety in modern software development and the potential for seemingly minor memory management issues to result in catastrophic security breaches.
Mitigation strategies for CVE-2013-1306 require immediate action through Microsoft's security updates and patches, as the vulnerability was addressed through the Microsoft Security Bulletin MS13-037. Organizations should prioritize patch deployment across all affected systems running Internet Explorer 9, particularly in enterprise environments where the browser remains in use. Additional protective measures include implementing browser security features such as Enhanced Protected Mode, disabling unnecessary browser components, and employing web filtering solutions to block access to known malicious domains. Network-based defenses such as intrusion detection systems can help identify exploitation attempts by monitoring for characteristic traffic patterns associated with memory corruption attacks. Security professionals should also consider implementing application whitelisting policies that restrict execution of unsigned code and maintain comprehensive monitoring of system logs for signs of exploitation attempts. The vulnerability underscores the necessity of regular security assessments and the importance of maintaining up-to-date security patches across all software components. Organizations should also consider transitioning away from legacy browser versions that no longer receive security updates, as Internet Explorer 9 reached end-of-life and no longer receives Microsoft security patches, leaving systems vulnerable to unpatched vulnerabilities like CVE-2013-1306.