CVE-2018-8512 in Edge
Summary
by MITRE
A security feature bypass vulnerability exists in Microsoft Edge when the Edge Content Security Policy (CSP) fails to properly validate certain specially crafted documents, aka "Microsoft Edge Security Feature Bypass Vulnerability." This affects Microsoft Edge. This CVE ID is unique from CVE-2018-8530.
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Analysis
by VulDB Data Team • 05/23/2023
The vulnerability identified as CVE-2018-8512 represents a critical security feature bypass in Microsoft Edge browser that undermines the Content Security Policy implementation designed to protect users from cross-site scripting and other code injection attacks. This flaw specifically targets the browser's Content Security Policy enforcement mechanism, which is a fundamental web security control that restricts how resources can be loaded and executed within web pages. The vulnerability arises from insufficient validation of specially crafted documents that can bypass the CSP restrictions, potentially allowing malicious actors to execute unauthorized code or access sensitive information.
The technical flaw manifests when Microsoft Edge processes documents that contain crafted elements designed to exploit gaps in the CSP validation logic. This occurs during the browser's parsing and rendering phase where certain malformed or specially constructed content can circumvent the security checks intended to prevent unauthorized script execution, resource loading, or other potentially harmful operations. The vulnerability specifically affects the browser's ability to properly enforce CSP directives that should prevent loading of external resources, execution of inline scripts, or other security-sensitive operations. This bypass mechanism allows attackers to craft documents that appear to comply with CSP rules while actually containing malicious content that can execute with elevated privileges within the browser context.
The operational impact of CVE-2018-8512 extends beyond simple privilege escalation as it represents a fundamental breakdown in the browser's security architecture that can be exploited in various attack scenarios. Attackers can leverage this vulnerability to deliver malicious payloads through compromised websites or phishing campaigns, potentially leading to full browser compromise, credential theft, or lateral movement within affected networks. The vulnerability is particularly dangerous because it operates at the browser level, meaning that successful exploitation can bypass traditional network security controls and endpoint protection mechanisms. This makes it a valuable vector for advanced persistent threats where attackers seek to maintain long-term access to target systems while evading detection by security monitoring tools.
Organizations affected by this vulnerability should implement immediate mitigations including updating to patched versions of Microsoft Edge, deploying browser security policies that restrict CSP enforcement, and monitoring for suspicious browser activity that may indicate exploitation attempts. The vulnerability aligns with CWE-284 Access Control Bypass, which specifically addresses situations where access controls fail to properly validate access requests. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence, as attackers can use the bypass to establish more persistent access to victim systems. Additional mitigations should include implementing network-based protections such as web application firewalls, monitoring for anomalous CSP violations, and ensuring that security policies are properly configured to prevent the exploitation of such vulnerabilities in the browser environment.