CVE-2017-8518 in Edge
Summary
by MITRE
Microsoft Edge allows a remote code execution vulnerability due to the way it accesses objects in memory, aka "Scripting Engine Memory Corruption Vulnerability".
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Analysis
by VulDB Data Team • 01/08/2021
The vulnerability identified as CVE-2017-8518 represents a critical memory corruption flaw within Microsoft Edge's scripting engine that enables remote code execution attacks. This vulnerability specifically affects the chakra scripting engine component responsible for processing javascript and other scripting languages within the browser environment. The flaw occurs when Edge improperly handles object references in memory, creating conditions where maliciously crafted web content can trigger memory corruption that adversaries can exploit to execute arbitrary code on affected systems. The vulnerability stems from insufficient validation of object access patterns during script execution, allowing attackers to manipulate memory layout and potentially overwrite critical system structures.
This memory corruption vulnerability operates through a sophisticated attack vector that leverages the browser's scripting engine to manipulate heap memory structures. The flaw is classified under CWE-125 as an out-of-bounds read condition, where the scripting engine fails to properly validate memory access boundaries when processing certain javascript objects. Attackers can craft malicious web pages that when loaded in Microsoft Edge trigger the vulnerable code path, leading to memory corruption that can be exploited to gain full system control. The vulnerability exists in the way Edge handles object references during javascript execution, particularly when dealing with complex object hierarchies and memory allocation patterns that can be manipulated through crafted input.
The operational impact of CVE-2017-8518 is severe and far-reaching within enterprise and individual computing environments. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary code with the privileges of the affected user account. This vulnerability is particularly dangerous because it can be triggered through web browsing activities without any user interaction beyond visiting a malicious website, making it an ideal candidate for drive-by download attacks. The vulnerability affects multiple versions of Microsoft Edge and Windows operating systems, with exploitation potentially leading to data theft, system persistence mechanisms, and lateral movement within networks. Organizations running affected Edge versions face significant risk of unauthorized access and potential data breaches.
Mitigation strategies for CVE-2017-8518 require immediate patch deployment from Microsoft, as the vulnerability was addressed through the July 2017 security updates. Organizations should implement browser hardening measures including enabling sandboxing features, restricting access to potentially vulnerable scripting components, and deploying web application firewalls to filter malicious content. The vulnerability aligns with ATT&CK technique T1203 - Exploitation for Client Execution, where adversaries leverage browser vulnerabilities to execute malicious code on target systems. Network administrators should also consider implementing security controls such as disabling javascript in restricted environments, employing content filtering solutions, and monitoring for suspicious web traffic patterns that may indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems running unsupported Edge versions that remain at risk.