CVE-2012-1879 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 6 through 9 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by attempting to access an undefined memory location, aka "insertAdjacentText Remote Code Execution Vulnerability."
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/17/2024
The vulnerability identified as CVE-2012-1879 represents a critical memory corruption flaw affecting Microsoft Internet Explorer versions 6 through 9. This issue stems from improper handling of objects within memory structures during web page rendering processes, creating a condition where attackers can manipulate memory access patterns to achieve arbitrary code execution. The vulnerability specifically manifests when Internet Explorer attempts to process certain HTML elements through the insertAdjacentText method, which is a DOM manipulation function used to insert text into document elements. This flaw falls under the CWE-125 vulnerability category, which describes out-of-bounds read conditions where programs access memory locations outside the bounds of allocated buffers, making it susceptible to exploitation through memory corruption attacks.
The technical exploitation of this vulnerability requires an attacker to craft malicious web content that triggers the problematic memory handling scenario when Internet Explorer processes the insertAdjacentText method. When the browser encounters malformed or specially constructed HTML elements, it attempts to access memory locations that have not been properly initialized or validated, creating a predictable memory access pattern that can be leveraged by remote attackers. This type of vulnerability is classified as a remote code execution flaw because attackers can deliver malicious content through web browsers without requiring any local system interaction from the victim. The attack vector operates entirely through web-based delivery mechanisms, making it particularly dangerous in environments where users frequently browse the internet or access untrusted web content.
The operational impact of CVE-2012-1879 extends beyond simple code execution, as it provides attackers with complete control over affected systems running vulnerable versions of Internet Explorer. Once successfully exploited, attackers can execute malicious code with the privileges of the current user, potentially leading to full system compromise, data theft, or establishment of persistent backdoors. The vulnerability affects a wide range of Windows operating systems including Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, and Windows 7, making it particularly dangerous in enterprise environments where multiple systems may be running vulnerable browser versions. This vulnerability aligns with the ATT&CK technique T1059.007, which describes the use of scripting languages for execution, as the exploitation leverages JavaScript within the browser context to manipulate DOM elements and trigger memory corruption.
Mitigation strategies for this vulnerability primarily focus on immediate patch deployment through Microsoft security updates, as the official fix addresses the underlying memory handling issues in the Internet Explorer rendering engine. Organizations should prioritize updating all affected systems to the latest security patches released by Microsoft, particularly since Internet Explorer 6 through 9 reached end-of-life support and no longer receive security updates. Additional defensive measures include implementing browser security configurations such as enabling protected mode, using enhanced security configuration settings, and deploying web application firewalls or proxy servers to filter potentially malicious content. The vulnerability demonstrates the importance of memory safety practices in browser development and highlights why modern browsers have implemented various exploit mitigation techniques including address space layout randomization, data execution prevention, and strict memory access controls. Network administrators should also consider implementing browser isolation techniques and restricting access to potentially malicious websites through content filtering solutions to reduce the attack surface for this and similar vulnerabilities.