CVE-2016-3388 in Edge
Summary
by MITRE
Microsoft Internet Explorer 10 and 11 and Microsoft Edge do not properly restrict access to private namespaces, which allows remote attackers to gain privileges via unspecified vectors, aka "Microsoft Browser Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-3387.
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Analysis
by VulDB Data Team • 06/30/2024
This vulnerability affects Microsoft Internet Explorer versions 10 and 11 as well as Microsoft Edge browsers, representing a critical elevation of privilege flaw that stems from improper handling of private namespaces within the browser's security model. The issue manifests when the browser fails to adequately restrict access to private namespaces, creating potential attack vectors that could allow remote adversaries to escalate their privileges. This vulnerability is categorized under CWE-264, which addresses permissions, privileges, and access control weaknesses, specifically focusing on insufficient access control mechanisms. The flaw operates at the core of browser security architecture where private namespaces should remain isolated from user-accessible contexts but instead permit unauthorized access that could lead to privilege escalation.
The technical implementation of this vulnerability involves the browser's namespace handling mechanisms that are designed to maintain separation between different security contexts. When private namespaces are improperly restricted, attackers can exploit this weakness through unspecified vectors that likely involve manipulating DOM elements or accessing restricted API surfaces. The vulnerability's impact extends beyond simple privilege escalation as it represents a fundamental breakdown in the browser's security boundaries, potentially allowing attackers to execute code with elevated privileges. This type of vulnerability aligns with ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," where adversaries leverage software vulnerabilities to gain higher-level permissions. The attack surface is particularly concerning given that these browsers are widely used and the vulnerability affects multiple versions simultaneously.
The operational impact of this vulnerability is significant as it could enable attackers to execute arbitrary code with elevated privileges, potentially leading to complete system compromise. Remote attackers could exploit this weakness without requiring user interaction, making it particularly dangerous in targeted attacks or when combined with other vulnerabilities. The vulnerability's classification as an elevation of privilege issue means that successful exploitation could allow attackers to bypass normal security restrictions and gain access to sensitive system resources. Organizations using these affected browsers face substantial risk, as the vulnerability could be leveraged in advanced persistent threat campaigns where attackers seek to establish persistent access to target systems. The fact that this vulnerability operates independently from CVE-2016-3387 indicates it represents a distinct attack surface that requires separate mitigation approaches.
Mitigation strategies should focus on immediate patch deployment through Microsoft's regular security updates, as this vulnerability was addressed in the respective security bulletins. Organizations should implement browser hardening measures including disabling unnecessary features, implementing strict content security policies, and maintaining up-to-date security configurations. Network-level protections such as web application firewalls and intrusion detection systems can help detect exploitation attempts, while monitoring for unusual privilege escalation activities should be implemented. The vulnerability's nature suggests that regular security assessments of browser configurations and user access controls would help identify potential exploitation attempts. Additionally, user education about phishing and social engineering attacks that might precede exploitation attempts remains crucial in defense-in-depth strategies, as attackers often combine this type of vulnerability with other attack vectors to maximize their impact.