CVE-2017-11767 in Edge
Summary
by MITRE
ChakraCore allows an attacker to gain the same user rights as the current user, due to the way that the ChakraCore scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability".
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Analysis
by VulDB Data Team • 11/17/2019
The vulnerability identified as CVE-2017-11767 represents a critical memory corruption flaw within Microsoft ChakraCore JavaScript engine that serves as the foundation for Edge browser and various other Microsoft applications. This vulnerability falls under the Common Weakness Enumeration category CWE-125, which specifically addresses out-of-bounds read conditions that can lead to memory corruption. The issue stems from how ChakraCore manages object references and memory allocation during JavaScript execution, creating opportunities for attackers to manipulate memory contents through carefully crafted malicious scripts.
The technical exploitation of this vulnerability occurs when the ChakraCore engine processes certain JavaScript objects that contain malformed memory references or improper object lifecycle management. Attackers can leverage this flaw by constructing malicious web content or scripts that trigger specific memory access patterns, causing the engine to read or write beyond allocated memory boundaries. This memory corruption can result in arbitrary code execution with the privileges of the currently logged-in user, effectively allowing attackers to escalate their access level within the system.
The operational impact of CVE-2017-11767 extends beyond simple privilege escalation, as it can be leveraged to achieve persistent system compromise through various attack vectors. The vulnerability is particularly dangerous in phishing scenarios where attackers can deliver malicious payloads through compromised websites or email attachments. According to ATT&CK framework, this vulnerability maps to techniques involving privilege escalation and execution through web-based attacks. The exploitability of this flaw makes it a prime target for advanced persistent threat actors who seek to establish footholds within enterprise networks, as successful exploitation can lead to complete system compromise and potential lateral movement.
Mitigation strategies for CVE-2017-11767 should include immediate deployment of Microsoft security updates and patches that address the memory corruption handling within ChakraCore. Organizations should implement network-based protections such as web application firewalls and content filtering systems to block known malicious scripts. Additionally, browser hardening measures including disabling unnecessary JavaScript features, implementing strict content security policies, and employing sandboxing techniques can significantly reduce the attack surface. Security monitoring should focus on detecting anomalous JavaScript execution patterns and memory access behaviors that may indicate exploitation attempts, while regular vulnerability assessments should verify system configurations against known exploit patterns. The vulnerability also highlights the importance of keeping all Microsoft components updated and implementing zero-trust network security models to limit the potential impact of such memory corruption vulnerabilities.