CVE-2013-1303 in Internet Explorer
Summary
by MITRE
Use-after-free vulnerability in Microsoft Internet Explorer 6 through 10 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-2013-1304 and CVE-2013-1338.
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Analysis
by VulDB Data Team • 05/06/2021
The CVE-2013-1303 vulnerability represents a critical use-after-free flaw in Microsoft Internet Explorer versions 6 through 10 that fundamentally compromises browser security through memory management errors. This vulnerability operates as a remote code execution vector that enables attackers to manipulate memory pointers after objects have been deallocated, creating exploitable conditions in the browser's memory management system. The flaw specifically affects Internet Explorer versions ranging from the older IE6 through the more recent IE10, making it particularly dangerous as it spans multiple generations of the browser. The vulnerability is categorized under CWE-416, which specifically addresses use-after-free conditions in software systems, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter usage, as successful exploitation typically leads to arbitrary code execution within the browser context.
The technical implementation of this vulnerability involves crafting malicious web content that triggers specific browser behaviors causing objects to be freed from memory while still being referenced by active code paths. When Internet Explorer encounters such crafted content, it attempts to access memory locations that have already been deallocated, leading to memory corruption that attackers can leverage to execute arbitrary code. The exploitation process typically begins with a malicious website that loads JavaScript or ActiveX components designed to trigger the memory management error through specific object manipulation patterns. This type of vulnerability falls under the category of heap-based use-after-free issues where the freed memory is reused for legitimate purposes, but the attacker can control the data that gets placed in that memory location. The vulnerability's impact is amplified by the fact that it affects multiple IE versions simultaneously, increasing the attack surface significantly.
The operational impact of CVE-2013-1303 extends beyond simple remote code execution, as successful exploitation allows attackers to gain complete control over affected systems. This includes the ability to install malware, modify system files, access sensitive data, and potentially escalate privileges within the compromised environment. The vulnerability's remote nature means that attackers can exploit it without requiring physical access to target systems, making it particularly dangerous in enterprise environments where users may browse untrusted websites. The attack chain typically involves initial compromise through phishing emails, malicious advertisements, or compromised websites that deliver the exploit code directly to the victim's browser. Once exploited, the vulnerability enables attackers to bypass many traditional security controls including user access controls and application whitelisting mechanisms, as the code executes within the trusted browser context. The vulnerability's classification as a remote code execution flaw makes it particularly attractive to advanced persistent threat actors and cybercriminals seeking to establish persistent access to target networks.
Mitigation strategies for CVE-2013-1303 should include immediate patch deployment for all affected Internet Explorer versions, as Microsoft released security updates specifically addressing this vulnerability. Organizations should implement browser hardening measures such as disabling ActiveX controls, implementing strict content security policies, and deploying web application firewalls to detect and block malicious content. The vulnerability's exploitation requires specific conditions that can be monitored through network traffic analysis and endpoint detection systems, enabling security teams to identify potential attacks before successful exploitation occurs. Additionally, user education regarding safe browsing practices and the dangers of visiting untrusted websites can significantly reduce the likelihood of successful exploitation. Security teams should also consider implementing sandboxing mechanisms for browser processes and maintaining up-to-date threat intelligence to identify new exploitation techniques targeting this vulnerability. The remediation process should include comprehensive testing of patches to ensure compatibility with existing enterprise applications while maintaining the security benefits of the update.