CVE-2012-1523 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 6 through 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing a deleted object, aka "Center Element Remote Code Execution Vulnerability."
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Analysis
by VulDB Data Team • 03/25/2021
The vulnerability identified as CVE-2012-1523 represents a critical memory corruption flaw in Microsoft Internet Explorer versions 6 through 8 that enables remote code execution through improper object handling in memory. This vulnerability specifically affects the browser's memory management system where objects are not properly validated before access, creating a condition that allows attackers to exploit memory access patterns. The flaw manifests when Internet Explorer attempts to access objects that have already been deleted from memory, creating a scenario where malicious code can be executed with the privileges of the user running the browser. This type of vulnerability falls under the category of memory safety issues and is particularly dangerous because it operates at the core memory management level of the browser, making it difficult to detect and prevent through standard security measures.
The technical exploitation of this vulnerability requires an attacker to craft malicious web content that triggers the specific memory access pattern leading to the execution of arbitrary code. When Internet Explorer processes web pages containing crafted content, it may attempt to access memory locations that have already been freed or deallocated, causing the browser to execute code from the attacker-controlled memory region. This memory corruption vulnerability is classified as a use-after-free condition, which is a well-known pattern in software security and maps directly to CWE-416, the Common Weakness Enumeration category for use after free errors. The vulnerability's impact is amplified by the fact that Internet Explorer 6 through 8 were widely deployed across enterprise environments, making this a significant threat vector for attackers targeting legacy systems.
The operational impact of CVE-2012-1523 extends beyond simple remote code execution to encompass complete system compromise when exploited successfully. Attackers can leverage this vulnerability to install malware, steal sensitive data, or establish persistent access to affected systems without requiring user interaction beyond visiting a malicious website. The vulnerability affects Windows operating systems including Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008, which were all in widespread use when this vulnerability was discovered. This widespread deployment, combined with the browser's central role in user workflows, creates a high-risk scenario where a single compromised website can lead to large-scale system infections. The vulnerability's exploitation aligns with ATT&CK technique T1203, which covers Exploitation for Client Execution, as it involves leveraging browser vulnerabilities to execute malicious code on target systems.
Microsoft addressed this vulnerability through security updates that corrected the memory management handling in Internet Explorer's object lifecycle management. Organizations should prioritize applying these patches immediately, as the vulnerability was actively exploited in the wild during its disclosure period. The recommended mitigation strategy involves not only patching the affected systems but also implementing network-based protections such as web application firewalls and browser isolation techniques. Security professionals should also consider deploying additional controls including browser hardening measures, restricted browsing environments, and monitoring for suspicious memory access patterns that could indicate exploitation attempts. Given that Internet Explorer 6 through 8 are no longer supported by Microsoft, organizations should plan for migration to modern browser platforms to eliminate exposure to this and similar legacy vulnerabilities that continue to pose threats in unpatched environments.