CVE-2018-8296 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 11. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288, CVE-2018-8291, CVE-2018-8298.
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Analysis
by VulDB Data Team • 04/05/2023
The vulnerability identified as CVE-2018-8296 represents a critical remote code execution flaw in Microsoft Internet Explorer 11's scripting engine, specifically within its memory handling mechanisms. This issue stems from improper object management during script execution, creating a pathway for malicious actors to execute arbitrary code on vulnerable systems. The vulnerability affects only Internet Explorer 11 across all supported Windows operating systems, making it particularly concerning given the browser's widespread deployment in enterprise environments and its integration with various corporate applications. The flaw manifests when the scripting engine processes certain objects in memory, leading to memory corruption that can be exploited by attackers to gain full system control.
The technical root cause of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions in memory management. The scripting engine fails to properly validate object boundaries during memory operations, allowing attackers to manipulate memory contents through crafted malicious scripts. When Internet Explorer processes specific JavaScript code patterns, the engine's memory management routines become compromised, potentially leading to heap corruption or stack overflow conditions. This memory corruption can be leveraged to overwrite critical memory locations, redirect program execution flow, and ultimately execute malicious payloads with the privileges of the logged-in user. The vulnerability operates at the intersection of multiple attack vectors including browser exploitation techniques and memory corruption methodologies.
From an operational perspective, this vulnerability presents significant risk to organizations relying on Internet Explorer 11 for business operations, particularly those with legacy systems that cannot be easily upgraded. Attackers can exploit this vulnerability through various delivery mechanisms including malicious websites, phishing emails with embedded scripts, or compromised web applications that serve malicious content. The remote nature of the exploit means that no user interaction is required beyond visiting a malicious site, making it particularly dangerous in targeted attacks. Once successfully exploited, the vulnerability allows attackers to establish persistent access, escalate privileges, and potentially move laterally within network environments. The impact extends beyond individual system compromise to include potential data exfiltration, system reconnaissance, and establishment of command and control channels.
Organizations should implement immediate mitigations including applying the Microsoft security update released alongside this vulnerability, disabling Internet Explorer 11 if possible, and implementing browser isolation techniques. Network segmentation and web application firewalls can help reduce attack surface, while user education regarding suspicious web content remains crucial. The vulnerability demonstrates the ongoing risks associated with legacy browser support and highlights the importance of maintaining up-to-date security patches. According to ATT&CK framework, this vulnerability maps to techniques involving exploitation of known vulnerabilities and privilege escalation, with potential for lateral movement through the established foothold. Organizations should also consider implementing browser hardening measures and transitioning away from unsupported browser versions to reduce exposure to similar threats. The vulnerability underscores the critical need for comprehensive vulnerability management programs that address both known and emerging threats in enterprise environments.