CVE-2018-8461 in Internet Explorer
Summary
by MITRE
A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer Memory Corruption Vulnerability." This affects Internet Explorer 11. This CVE ID is unique from CVE-2018-8447.
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Analysis
by VulDB Data Team • 05/08/2023
The vulnerability described in CVE-2018-8461 represents a critical memory corruption flaw within Internet Explorer 11 that enables remote code execution under specific conditions. This vulnerability arises from improper handling of objects in memory during the browser's operation, creating a pathway for malicious actors to execute arbitrary code on affected systems. The flaw specifically impacts Internet Explorer 11 running on Windows operating systems, making it particularly concerning given the widespread deployment of this browser in enterprise environments and user workstations. The vulnerability's classification as a memory corruption issue aligns with CWE-125, which describes out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution.
The technical mechanism behind this vulnerability involves Internet Explorer's handling of memory objects during web page rendering and script execution processes. When the browser encounters certain malformed or malicious web content, it fails to properly validate object references in memory, leading to memory corruption that can be exploited by attackers. This type of vulnerability typically occurs when the browser's memory management routines do not adequately check bounds or validate object states before accessing memory locations. The exploitation process often involves crafting specific web content that triggers the memory corruption, allowing attackers to execute malicious code with the privileges of the victim user. This vulnerability falls under the ATT&CK technique T1059.001, which covers command and scripting interpreter, as attackers can leverage the executed code to establish further footholds in compromised systems.
The operational impact of CVE-2018-8461 extends beyond simple remote code execution, as it can lead to complete system compromise and persistent access for threat actors. Once successfully exploited, attackers can install malware, steal sensitive data, modify system configurations, or establish backdoors for continued access. The vulnerability's remote nature means that users need only visit a malicious website or open a malicious email attachment to be compromised, making it particularly dangerous in phishing campaigns and drive-by download attacks. Organizations with outdated Internet Explorer installations face significant risk, as this vulnerability can be exploited without user interaction in certain scenarios, particularly when combined with other browser-based exploits or social engineering tactics.
Mitigation strategies for this vulnerability primarily involve immediate patching of affected systems with the security updates released by Microsoft. The patch addresses the underlying memory corruption issue by implementing proper bounds checking and memory validation routines within Internet Explorer's object handling processes. Organizations should also consider implementing additional security measures such as browser hardening configurations, network segmentation, and enhanced email filtering to reduce the attack surface. Disabling Internet Explorer or transitioning to more secure browser alternatives represents a long-term solution for organizations seeking to eliminate this specific threat vector. Security teams should monitor for exploitation attempts through network traffic analysis and endpoint detection systems, as the vulnerability's exploitation often generates specific network signatures that can be detected by intrusion detection systems. The vulnerability's classification as a remote code execution flaw makes it particularly important for organizations to maintain up-to-date security patches and implement comprehensive vulnerability management processes to prevent successful exploitation attempts.