CVE-2017-0233 in Edge
Summary
by MITRE
An elevation of privilege vulnerability exists in Microsoft Edge that could allow an attacker to escape from the AppContainer sandbox in the browser, aka "Microsoft Edge Elevation of Privilege Vulnerability." This CVE ID is unique from CVE-2017-0241.
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Analysis
by VulDB Data Team • 12/22/2020
The vulnerability described in CVE-2017-0233 represents a critical security flaw in Microsoft Edge browser that allows attackers to bypass the AppContainer sandbox protection mechanism. This sandboxing technology is designed to isolate browser processes from the underlying operating system and other applications, creating a secure execution environment that prevents malicious code from accessing sensitive system resources or performing unauthorized operations. The flaw specifically affects the browser's handling of certain memory management operations and process isolation mechanisms that are fundamental to maintaining the security boundaries between the browser and the host system.
The technical implementation of this vulnerability stems from improper handling of memory allocation and deallocation within the Edge rendering engine, particularly when processing specially crafted web content. Attackers can exploit this weakness by constructing malicious web pages that trigger specific memory corruption conditions, which then allow the execution of arbitrary code outside the intended sandbox boundaries. This type of vulnerability falls under the CWE-119 weakness category, which encompasses memory safety issues including buffer overflows, use-after-free conditions, and improper memory access patterns that can lead to privilege escalation. The flaw operates at the intersection of memory management and process isolation, creating a pathway for attackers to escalate their privileges from the limited browser context to full system-level access.
The operational impact of CVE-2017-0233 is severe and far-reaching, as it fundamentally undermines the security model that Microsoft Edge relies on to protect users from malicious web content. Successful exploitation enables attackers to execute code with the same privileges as the user running the browser, potentially allowing them to install malware, access sensitive files, modify system configurations, or even escalate to administrative privileges. The vulnerability is particularly dangerous because it operates at the system level rather than just within the browser context, meaning that once exploited, attackers can leverage the elevated privileges to perform actions that would normally be restricted. This type of attack vector is categorized under the ATT&CK framework's privilege escalation techniques, specifically targeting the "Process Injection" and "Exploitation for Privilege Escalation" tactics that adversaries use to gain higher-level access to compromised systems.
Mitigation strategies for this vulnerability require immediate patching of affected Microsoft Edge versions, as Microsoft released security updates to address the underlying memory management issues. Organizations should implement comprehensive browser hardening measures including disabling unnecessary browser features, implementing strict content security policies, and maintaining up-to-date security patches across all systems. The vulnerability also highlights the importance of sandboxing mechanisms in modern browsers and demonstrates how even sophisticated isolation techniques can be compromised through carefully crafted exploits. Network monitoring solutions should be configured to detect unusual browser behavior patterns that might indicate exploitation attempts, while endpoint protection systems should be enhanced to detect and prevent the execution of malicious code within browser processes. This vulnerability serves as a critical reminder of the ongoing arms race between security researchers and attackers in the browser security landscape, where even seemingly minor implementation flaws can result in significant privilege escalation capabilities.