CVE-2017-8738 in Edge
Summary
by MITRE
Microsoft Edge in Microsoft Windows 10 Gold, 1511, 1607, and Windows Server 2016 allows an attacker to execute arbitrary code in the context of the current user, due to the way that the Microsoft Edge scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8649, CVE-2017-8660, CVE-2017-8729, CVE-2017-8740, CVE-2017-8741, CVE-2017-8748, CVE-2017-8752, CVE-2017-8753, CVE-2017-8755, CVE-2017-8756, and CVE-2017-11764.
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Analysis
by VulDB Data Team • 01/12/2021
This vulnerability represents a critical memory corruption flaw within Microsoft Edge's scripting engine that affects multiple Windows 10 versions and Windows Server 2016 systems. The issue stems from improper handling of objects in memory during script execution, creating a pathway for arbitrary code execution with the privileges of the current user. The vulnerability specifically targets the JavaScript engine's memory management mechanisms, where malformed script objects can trigger buffer overflows or use-after-free conditions that attackers can exploit to gain unauthorized system access.
The technical nature of this flaw aligns with CWE-125, which describes out-of-bounds read vulnerabilities, and CWE-787, which covers out-of-bounds write conditions. Attackers can leverage this vulnerability by crafting malicious web content that, when loaded in Microsoft Edge, causes the browser to improperly manage memory allocations. The scripting engine's failure to properly validate object references during memory operations creates opportunities for attackers to manipulate memory layout and execute malicious code directly within the browser process context. This type of vulnerability typically requires user interaction through visiting compromised websites or clicking on malicious links, making it particularly dangerous in phishing campaigns.
The operational impact of CVE-2017-8738 extends beyond simple privilege escalation as it provides attackers with persistent access to affected systems. Once successfully exploited, the vulnerability allows adversaries to execute code with the same privileges as the compromised user account, potentially enabling further lateral movement within networks, data exfiltration, or deployment of additional malware. The vulnerability's presence across multiple Windows 10 releases including the Gold version, 1511, and 1607, as well as Windows Server 2016, indicates a widespread exposure that affects organizations running these operating systems. The vulnerability's relationship to the ATT&CK framework's technique T1059.007 for script-based execution and T1068 for local privilege escalation demonstrates how this flaw can be weaponized in comprehensive attack chains.
Organizations should implement immediate mitigations including deploying Microsoft's security patches and updates as soon as they become available, configuring browser security settings to restrict potentially malicious content, and implementing network-based protections such as web application firewalls. Additionally, user education regarding safe browsing practices and the dangers of visiting untrusted websites remains critical. The vulnerability's classification as a remote code execution flaw necessitates proactive network monitoring for exploitation attempts and comprehensive incident response procedures to address potential compromises. System administrators should prioritize patch management processes and consider implementing additional security layers such as exploit prevention software and browser hardening configurations to reduce the attack surface.