CVE-2018-8389 in Internet Explorer
Summary
by MITRE
A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Memory Corruption Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8373, CVE-2018-8385, CVE-2018-8390.
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Analysis
by VulDB Data Team • 05/02/2023
The vulnerability identified as CVE-2018-8389 represents a critical memory corruption flaw within Internet Explorer's scripting engine that enables remote code execution attacks. This issue specifically targets the manner in which the browser's JavaScript engine manages objects in memory, creating opportunities for malicious actors to exploit memory handling mechanisms and execute arbitrary code on affected systems. The vulnerability affects multiple versions of Internet Explorer including IE9, IE11, and IE10, making it particularly concerning given the widespread deployment of these browsers in enterprise environments. The flaw operates at a fundamental level within the browser's memory management system, where improper handling of object references can lead to unpredictable behavior and potential code execution.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations in memory management systems. The scripting engine's memory corruption occurs when processing certain JavaScript objects, particularly when the engine attempts to manage memory allocation for dynamically created objects. Attackers can craft malicious web pages that trigger specific memory access patterns, causing the browser to write data beyond allocated memory boundaries or read from invalid memory locations. This type of vulnerability falls under the ATT&CK technique T1059.007 for JavaScript and VBScript, where adversaries leverage browser-based scripting languages to execute malicious code. The memory corruption can be exploited through various attack vectors including malicious websites, email attachments, or compromised web applications that deliver the malicious JavaScript payload to the target system.
The operational impact of CVE-2018-8389 extends beyond simple remote code execution to encompass complete system compromise and data theft capabilities. Once successfully exploited, attackers can gain full control over the affected system, potentially leading to lateral movement within networks, privilege escalation, and persistent access. The vulnerability's exploitation requires minimal user interaction, often only visiting a malicious website, making it particularly dangerous in enterprise environments where users may inadvertently encounter compromised content. The attack surface is broad due to the prevalence of Internet Explorer across various organizational systems, particularly in legacy environments where browser updates may be delayed or restricted. Organizations running affected versions of Internet Explorer face significant risk of data breaches, system compromise, and potential regulatory compliance violations, especially in industries with strict security requirements such as finance, healthcare, and government sectors.
Mitigation strategies for CVE-2018-8389 should prioritize immediate patching of affected systems through Microsoft's security updates, as the vulnerability has been addressed through official Microsoft security bulletins. Organizations should implement browser hardening measures including disabling unnecessary scripting capabilities, implementing content security policies, and deploying web application firewalls to filter malicious content. The use of modern browsers such as Microsoft Edge or Chrome, which have more robust security features and better memory management, should be considered as long-term solutions to reduce exposure to similar vulnerabilities. Network segmentation and monitoring should be enhanced to detect potential exploitation attempts, with particular attention to unusual memory access patterns or JavaScript execution anomalies. Additionally, user education regarding safe browsing practices and the importance of keeping browsers updated remains crucial in defending against this type of attack, as many exploitation attempts rely on social engineering to deliver malicious payloads to unsuspecting users.