CVE-2018-8381 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-2018-8266, CVE-2018-8380, CVE-2018-8384.
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Analysis
by VulDB Data Team • 05/01/2023
The vulnerability described in CVE-2018-8381 represents a critical memory corruption flaw within Microsoft Edge's Chakra scripting engine, which serves as the JavaScript engine powering the browser's execution environment. This particular weakness manifests when the engine processes objects in memory, creating conditions that allow attackers to manipulate memory structures in ways that can lead to arbitrary code execution. The Chakra engine is responsible for interpreting and executing JavaScript code within the browser, making it a prime target for exploitation due to its central role in web application processing. The vulnerability specifically impacts Microsoft Edge versions that utilize the Chakra engine and also affects ChakraCore, Microsoft's open-source version of the engine that is used in various other applications beyond the browser. The distinct nature of this CVE distinguishes it from related vulnerabilities such as CVE-2018-8266, CVE-2018-8380, and CVE-2018-8384, which address different aspects of the same engine's memory handling mechanisms.
The technical exploitation of this memory corruption vulnerability occurs through carefully crafted JavaScript code that manipulates object references in memory, leading to unpredictable behavior that can be leveraged by attackers. When the Chakra engine encounters malformed or maliciously constructed objects during execution, it fails to properly validate memory boundaries or object states, allowing for buffer overflows, use-after-free conditions, or other memory corruption scenarios. This flaw enables attackers to overwrite critical memory locations, potentially redirecting execution flow to malicious code injected into the browser's memory space. The vulnerability's impact extends beyond simple code execution, as it can be used to bypass security mechanisms such as address space layout randomization and data execution prevention, making it particularly dangerous in modern security environments. According to CWE classification, this vulnerability maps to CWE-125: Out-of-bounds Read and CWE-787: Out-of-bounds Write, both of which represent fundamental memory safety issues that can lead to complete system compromise.
The operational impact of CVE-2018-8381 is severe and multifaceted, as it provides attackers with a pathway to achieve full system compromise through browser-based attacks. Once successfully exploited, the vulnerability allows adversaries to execute arbitrary code with the privileges of the user running Microsoft Edge, potentially leading to data theft, system infiltration, or deployment of additional malware. The remote nature of the vulnerability means that attackers can exploit it through web pages without requiring any local interaction from the victim, making it particularly dangerous in phishing campaigns or compromised websites. This vulnerability directly maps to ATT&CK technique T1059.007: Command and Scripting Interpreter: JavaScript, as attackers can leverage JavaScript code to exploit the memory corruption and gain control over the target system. The attack surface is extensive given that Microsoft Edge is widely used across enterprise and consumer environments, making this vulnerability a high-priority target for threat actors seeking to conduct large-scale attacks. Organizations using Edge-based applications or those that rely on ChakraCore for their software platforms are particularly at risk.
Mitigation strategies for CVE-2018-8381 must address both immediate remediation and long-term security posture improvements. Microsoft released security patches for this vulnerability through regular Windows updates, and organizations should prioritize immediate deployment of these patches to protect their systems. The recommended approach includes implementing network-based protections such as web application firewalls that can detect and block malicious JavaScript patterns, along with browser hardening measures that restrict JavaScript execution capabilities. Security teams should also consider implementing monitoring solutions that can detect anomalous memory access patterns or unusual JavaScript behavior that might indicate exploitation attempts. Additionally, organizations should conduct regular security assessments of their Edge-based applications and ensure that ChakraCore implementations are kept up to date with the latest security patches. The vulnerability highlights the importance of proper memory management practices and the need for continuous security testing of scripting engines. Organizations should also consider implementing sandboxing mechanisms and privilege separation to limit the potential damage from successful exploitation attempts. Regular security awareness training for users about the dangers of visiting untrusted websites and opening suspicious email attachments remains crucial in defending against this type of vulnerability.