CVE-2018-8112 in Edge
Summary
by MITRE
A security feature bypass vulnerability exists when Microsoft Edge improperly handles requests of different origins, aka "Microsoft Edge Security Feature Bypass Vulnerability." This affects Microsoft Edge.
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Analysis
by VulDB Data Team • 03/11/2023
The CVE-2018-8112 vulnerability represents a critical security feature bypass in Microsoft Edge browser that stems from improper handling of cross-origin requests. This flaw allows attackers to circumvent intended security protections that should prevent malicious code from accessing resources across different origins, fundamentally undermining the browser's security model. The vulnerability specifically impacts the same-origin policy implementation within Edge, which is a fundamental web security principle designed to isolate web pages from each other to prevent unauthorized access to sensitive data. When Edge fails to properly enforce origin restrictions, it creates opportunities for attackers to execute unauthorized operations that should be blocked by standard browser security mechanisms. The issue manifests when the browser processes requests from different origins without adequate validation, potentially allowing malicious actors to access restricted resources or execute code with elevated privileges.
This vulnerability operates at the core of web application security by exploiting weaknesses in how Microsoft Edge manages cross-origin resource sharing and security boundaries. The technical flaw lies in the browser's insufficient validation of origin parameters during request processing, enabling attackers to craft malicious requests that bypass the security controls designed to protect users from cross-site scripting attacks and other origin-based threats. The vulnerability can be leveraged to perform actions such as accessing local files, reading sensitive data from other domains, or executing unauthorized operations that should be restricted by the browser's security model. From a cybersecurity perspective, this represents a significant weakening of the browser's defense-in-depth strategy, as it undermines the fundamental isolation mechanisms that separate different web contexts and protect user data from malicious actors. The flaw essentially creates a pathway for attackers to bypass the same-origin policy enforcement, which is one of the most critical security measures in modern web browsers.
The operational impact of CVE-2018-8112 extends beyond simple privilege escalation to encompass potential data breaches, session hijacking, and full system compromise when combined with other attack vectors. Attackers can exploit this vulnerability to perform cross-site request forgery attacks, access user credentials, steal session tokens, or execute malicious scripts against unsuspecting users who visit compromised websites. The vulnerability is particularly dangerous because it can be exploited through social engineering campaigns where users are directed to malicious websites that leverage the bypass to access their sensitive information. Organizations using Microsoft Edge are at risk of unauthorized access to corporate data, user accounts, and sensitive system resources, making this vulnerability a significant concern for enterprises and individual users alike. The impact is amplified when considering that Edge was widely used in enterprise environments, potentially affecting thousands of systems simultaneously if exploited at scale.
Mitigation strategies for CVE-2018-8112 should focus on immediate patch deployment and enhanced monitoring of browser activities for suspicious cross-origin requests. Microsoft released security updates that addressed the vulnerability by strengthening origin validation mechanisms and improving the enforcement of same-origin policies within Edge. Organizations should implement comprehensive browser hardening measures, including disabling unnecessary features, implementing strict content security policies, and monitoring for anomalous cross-origin behavior. Network administrators should consider deploying web application firewalls and intrusion detection systems to monitor for exploitation attempts. From a defensive standpoint, this vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter usage, as attackers may leverage the bypass to execute malicious scripts within the browser context. The vulnerability also relates to CWE-345 Insufficient Verification of Data Authenticity, as it involves improper validation of origin parameters that should be rigorously checked before allowing cross-origin operations. Security teams should implement regular vulnerability assessments and penetration testing to identify similar weaknesses in browser configurations and ensure that all security features are properly enforced. Additionally, user education regarding phishing attempts and suspicious website visits remains crucial in preventing exploitation of this vulnerability through social engineering approaches.