CVE-2017-8606 in Internet Explorer
Summary
by MITRE
Microsoft browsers in Microsoft Windows 7, Windows Server 2008 and R2, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow an attacker to execute arbitrary code in the context of the current user when the JavaScript engines fail to render when handling objects in memory in Microsoft browsers, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8598, CVE-2017-8596, CVE-2017-8618, CVE-2017-8619, CVE-2017-8610, CVE-2017-8601, CVE-2017-8603, CVE-2017-8604, CVE-2017-8605, CVE-2017-8595, CVE-2017-8607, CVE-2017-8608, and CVE-2017-8609
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Analysis
by VulDB Data Team • 12/12/2022
This vulnerability represents a critical memory corruption flaw in Microsoft's JavaScript engines that affects multiple versions of the Windows operating system and its associated browsers. The issue stems from improper handling of objects in memory during JavaScript execution, creating a condition where malicious code can exploit the scripting engine's memory management routines to achieve arbitrary code execution. The vulnerability specifically impacts Windows 7, Windows Server 2008 and R2, Windows 8.1, Windows RT 8.1, Windows Server 2012 and R2, Windows 10 versions 1511, 1607, and 1703, and Windows Server 2016, making it particularly concerning given the widespread deployment of these systems across enterprise environments. The flaw falls under the Common Weakness Enumeration category CWE-125, which describes out-of-bounds read vulnerabilities that can lead to memory corruption and unauthorized code execution.
The technical exploitation of this vulnerability occurs when the JavaScript engine fails to properly render objects in memory, leading to a situation where attacker-controlled data can overwrite critical memory locations. This memory corruption allows an attacker to manipulate the execution flow of the browser process and ultimately execute malicious code with the privileges of the current user. The attack typically requires user interaction through visiting a malicious webpage or opening a specially crafted document that triggers the vulnerable JavaScript engine behavior. This makes the vulnerability particularly dangerous in social engineering scenarios where users might be tricked into visiting compromised websites or opening malicious attachments.
The operational impact of CVE-2017-8606 extends beyond simple code execution, as it provides attackers with a foothold for more sophisticated attacks within the compromised system. Once an attacker successfully exploits this vulnerability, they can potentially escalate privileges, install persistent backdoors, or use the compromised browser as a launching point for further attacks within the network. The vulnerability's presence in both desktop and server operating systems means that organizations running these versions face significant risk, particularly in environments where users have administrative privileges or where the browsers are used to access sensitive corporate resources. This vulnerability aligns with ATT&CK technique T1059.007 for script-based execution and T1068 for local privilege escalation, making it a valuable tool for attackers seeking to establish persistent access.
Mitigation strategies for this vulnerability primarily focus on applying Microsoft's security patches and updates as soon as they become available. Organizations should prioritize patch management for all affected Windows versions and ensure that automatic updates are enabled where possible. Browser isolation techniques and sandboxing mechanisms can provide additional protection layers, though these solutions may impact user experience and system performance. Network-based protections such as web application firewalls and content filtering solutions can help detect and block malicious content before it reaches vulnerable systems. Security monitoring should include detection of suspicious JavaScript execution patterns and memory access anomalies that might indicate exploitation attempts. Given the nature of memory corruption vulnerabilities, implementing address space layout randomization and data execution prevention mechanisms can make exploitation more difficult, though these protections alone are insufficient to prevent exploitation of this specific vulnerability. Regular security assessments and vulnerability scanning should include checks for unpatched systems running affected Windows versions to ensure comprehensive protection coverage across the enterprise environment.