CVE-2016-7201 in Edge
Summary
by MITRE
The Chakra JavaScript scripting engine in Microsoft Edge allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Scripting Engine Memory Corruption Vulnerability," a different vulnerability than CVE-2016-7200, CVE-2016-7202, CVE-2016-7203, CVE-2016-7208, CVE-2016-7240, CVE-2016-7242, and CVE-2016-7243.
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Analysis
by VulDB Data Team • 09/09/2024
The vulnerability identified as CVE-2016-7201 represents a critical memory corruption flaw within Microsoft Edge's Chakra JavaScript engine, which serves as the core component responsible for executing JavaScript code in the browser environment. This vulnerability specifically affects the scripting engine's handling of memory allocation and management during JavaScript execution, creating a pathway for malicious actors to exploit the browser's memory handling mechanisms. The flaw manifests when a specially crafted website attempts to manipulate the JavaScript engine's memory structures, potentially leading to arbitrary code execution or system instability. The Chakra engine's complex memory management system, designed to optimize JavaScript performance through just-in-time compilation and memory reuse, becomes a target for attackers seeking to manipulate memory pointers or corrupt heap structures. This particular vulnerability demonstrates the inherent complexity of modern JavaScript engines and their susceptibility to memory-related exploits that can bypass traditional security measures.
The technical exploitation of CVE-2016-7201 involves sophisticated manipulation of JavaScript objects and memory layouts within the Chakra engine's runtime environment. Attackers can craft malicious web pages that trigger specific memory corruption patterns through carefully constructed JavaScript code sequences, potentially leveraging heap spraying techniques or memory layout manipulation to achieve code execution. The vulnerability operates at a low level within the browser's memory management system, where improper bounds checking or memory pointer handling allows attackers to overwrite critical memory regions. This type of memory corruption vulnerability typically stems from inadequate input validation or improper handling of JavaScript object lifecycles within the engine's memory allocator. The attack surface extends beyond simple code execution to include potential denial of service scenarios where the browser crashes or becomes unresponsive due to corrupted memory structures that prevent normal operation of the JavaScript engine.
The operational impact of CVE-2016-7201 extends significantly beyond individual user exposure, as it represents a vector for widespread exploitation across Microsoft Edge users who may encounter malicious websites through various attack vectors including phishing campaigns, compromised websites, or drive-by downloads. The vulnerability's classification as a remote code execution flaw means that users need only visit a malicious website to potentially compromise their systems, making it particularly dangerous in enterprise environments where users may inadvertently access compromised web content. Organizations deploying Microsoft Edge as their primary browser face substantial risk from this vulnerability, as it can enable attackers to establish persistent access to systems, escalate privileges, or deploy additional malware payloads. The memory corruption nature of the vulnerability also makes it difficult to detect through traditional signature-based security measures, as the exploitation patterns may appear as normal browser behavior until the memory corruption manifests.
Mitigation strategies for CVE-2016-7201 focus primarily on immediate patching and browser updates from Microsoft, as the vulnerability requires core engine modifications to address the underlying memory handling issues. Security professionals should implement network-based protections including web application firewalls and content filtering systems that can detect and block known malicious JavaScript patterns. Browser hardening techniques such as disabling unnecessary JavaScript features, implementing strict content security policies, and using sandboxing mechanisms can reduce the attack surface for exploitation. Organizations should also consider implementing monitoring solutions that can detect abnormal memory usage patterns or browser crashes that may indicate exploitation attempts. The vulnerability aligns with common attack patterns documented in the attack tree framework, particularly those involving browser-based exploitation techniques and memory corruption vulnerabilities. According to CWE classification, this vulnerability maps to CWE-125, which addresses out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write conditions, both of which are fundamental memory safety issues in software development. Defense in depth strategies should include user education about avoiding suspicious websites, implementing browser security extensions, and maintaining current threat intelligence feeds to identify potential exploitation attempts. Regular security assessments of browser configurations and network traffic analysis can help detect anomalous behavior that might indicate successful exploitation of this vulnerability.