CVE-2017-0229 in Edge
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Edge in the way JavaScript engines render when handling objects in memory, aka "Scripting Engine Memory Corruption Vulnerability." This CVE ID is unique from CVE-2017-0224, CVE-2017-0228, CVE-2017-0230, CVE-2017-0234, CVE-2017-0235, CVE-2017-0236, and CVE-2017-0238.
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Analysis
by VulDB Data Team • 12/22/2020
The vulnerability identified as CVE-2017-0229 represents a critical remote code execution flaw within Microsoft Edge's JavaScript engine, specifically manifesting as a memory corruption issue during object handling operations. This vulnerability resides in the scripting engine component that processes JavaScript code within the browser environment, making it particularly dangerous as it can be exploited through web-based attacks without requiring user interaction beyond visiting a malicious website. The flaw stems from improper memory management when JavaScript objects are created, manipulated, and destroyed during execution, creating conditions where attacker-controlled data can overwrite critical memory regions. The vulnerability is classified under CWE-125 as an out-of-bounds read condition, though it manifests more specifically as a memory corruption issue that allows arbitrary code execution. This type of vulnerability falls squarely within the ATT&CK technique T1203 - Exploitation for Client Execution, where adversaries leverage browser vulnerabilities to execute malicious code on target systems. The impact extends beyond simple browser compromise as successful exploitation can lead to full system compromise, given that Edge's JavaScript engine operates with sufficient privileges to potentially access system resources.
The technical exploitation of CVE-2017-0229 occurs when malicious JavaScript code is executed within the Edge browser context, specifically targeting the V8 JavaScript engine's memory management routines. Attackers craft payloads that manipulate JavaScript objects in ways that cause memory corruption, typically through techniques involving object reuse, buffer overflows, or use-after-free conditions. The vulnerability becomes exploitable when Edge processes specially crafted JavaScript that triggers memory corruption in the engine's heap management system. This allows attackers to execute arbitrary code with the privileges of the Edge process, which typically runs with limited user privileges but can potentially be escalated through additional attack vectors. The memory corruption specifically affects how the browser handles object references and memory allocation patterns, creating opportunities for attackers to overwrite function pointers, return addresses, or other critical memory structures. The vulnerability's exploitation requires precise control over memory layout and understanding of the browser's internal memory management, making it a sophisticated target for advanced persistent threat actors. Security researchers have noted that this vulnerability can be chained with other exploits to bypass modern security mitigations such as address space layout randomization and data execution prevention mechanisms.
The operational impact of CVE-2017-0229 extends significantly beyond traditional browser-based attacks, as it represents a critical weakness in Microsoft's defense-in-depth strategy for web browser security. Organizations running Microsoft Edge browsers are at risk of targeted attacks that can lead to complete system compromise, data exfiltration, and persistent access to network resources. The vulnerability's remote exploitability means that attackers can target users without requiring physical access or specialized local privileges, making it particularly dangerous in enterprise environments where Edge may be the default browser. Security teams must consider the potential for this vulnerability to be used in phishing campaigns, drive-by download attacks, or as part of multi-stage attack chains that leverage other browser vulnerabilities. The vulnerability's classification as a remote code execution flaw places it in the highest severity category according to industry standards, requiring immediate attention and remediation. Organizations may face regulatory and compliance implications if systems are compromised through exploitation of this vulnerability, particularly in sectors with strict data protection requirements. The attack surface for this vulnerability includes any user interaction with web content, making it particularly challenging to defend against in environments where users must access external websites and web applications. This vulnerability also highlights the complexity of modern browser security architectures where multiple attack vectors exist within a single application, requiring comprehensive security strategies that address both client-side and server-side threats.
Mitigation strategies for CVE-2017-0229 should include immediate deployment of Microsoft's security patches and updates, as well as implementation of network-based defenses such as web application firewalls and content filtering solutions. Organizations should consider implementing browser hardening techniques including disabling unnecessary JavaScript features, restricting access to potentially malicious websites, and implementing strict content security policies. Network segmentation and monitoring solutions should be deployed to detect anomalous behavior that may indicate exploitation attempts, including unusual memory access patterns or network connections to known malicious domains. Security teams should also implement user education programs to reduce the risk of social engineering attacks that may leverage this vulnerability. Additional mitigations include enabling exploit protection mechanisms such as Windows Defender Application Control, implementing strict browser security policies, and regularly auditing browser configurations to ensure they align with security best practices. The vulnerability's exploitation typically requires specific conditions that can be detected through behavioral monitoring, making proactive threat hunting and incident response capabilities essential for organizations that cannot immediately patch all affected systems. Organizations should also consider implementing automated patch management systems to ensure rapid deployment of security updates and maintain visibility into their security posture through regular vulnerability assessments and penetration testing activities.