CVE-2018-8541 in Edge
Summary
by MITRE
A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-8542, CVE-2018-8543, CVE-2018-8551, CVE-2018-8555, CVE-2018-8556, CVE-2018-8557, CVE-2018-8588.
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Analysis
by VulDB Data Team • 06/05/2023
The vulnerability described in CVE-2018-8541 represents a critical memory corruption flaw within Microsoft Edge's Chakra scripting engine, which serves as the JavaScript engine responsible for executing web content. This particular weakness enables remote code execution when malicious actors craft specifically designed web pages that exploit improper memory handling during object manipulation. The Chakra engine processes JavaScript code by creating and managing objects in memory, and this vulnerability arises from inadequate validation mechanisms that fail to properly handle certain object operations, leading to unpredictable memory states.
The technical exploitation of this vulnerability occurs through memory corruption techniques that leverage the way Chakra manages object references and memory allocation. When the scripting engine processes certain JavaScript constructs, it fails to validate object states properly, potentially allowing attackers to manipulate memory pointers or overwrite critical data structures. This flaw falls under the CWE-121 category of "Stack-based Buffer Overflow" and aligns with ATT&CK techniques involving code injection and privilege escalation. The vulnerability specifically affects the memory management subsystem of Chakra, where objects may be improperly deallocated or accessed after being freed, creating opportunities for attackers to inject malicious code into the browser's memory space.
From an operational perspective, this vulnerability poses significant risks to Microsoft Edge users and organizations relying on the browser for web-based applications. Attackers can leverage this flaw through drive-by downloads, malicious websites, or phishing campaigns without requiring user interaction beyond visiting compromised pages. The remote execution capability means that successful exploitation can result in full system compromise, allowing attackers to execute arbitrary code with the privileges of the Edge process. This vulnerability affects not only Microsoft Edge but also ChakraCore, which is used in various Microsoft products and applications that rely on the Chakra engine for scripting functionality, amplifying the potential impact across multiple attack vectors.
Mitigation strategies for CVE-2018-8541 should prioritize immediate patch deployment through Microsoft's security updates, as the vulnerability has been addressed through security patches released in August 2018. Organizations should implement browser hardening measures including enabling sandboxing features, restricting JavaScript execution in sensitive contexts, and deploying web application firewalls to detect and block malicious payloads. Network-based defenses such as intrusion detection systems should be configured to monitor for suspicious JavaScript patterns that may indicate exploitation attempts. Additionally, security teams should conduct regular vulnerability assessments targeting Chakra engine components and maintain updated threat intelligence feeds to identify potential exploitation attempts. The vulnerability demonstrates the critical importance of proper memory management in scripting engines and highlights the necessity of robust input validation mechanisms in browser components that handle dynamic code execution.