CVE-2018-6112 in Chrome
Summary
by MITRE
Making URLs clickable and allowing them to be styled in DevTools in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page.
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Analysis
by VulDB Data Team • 07/19/2024
The vulnerability identified as CVE-2018-6112 represents a significant security flaw in Google Chrome's DevTools implementation that existed prior to version 66.0.3359.117. This issue specifically pertains to the handling of URL clickable elements and styling capabilities within the browser's developer tools interface. The vulnerability stems from insufficient validation and sanitization of HTML content when DevTools processes and renders web pages, creating an attack vector that could be exploited by remote adversaries to circumvent intended navigation restrictions.
The technical flaw manifests through the improper handling of HTML elements within Chrome's DevTools environment where clickable URLs and their associated styling properties could be manipulated in ways that bypassed normal browser security controls. When DevTools processes HTML content, it typically operates with elevated privileges and access to the underlying browser functionality. The vulnerability exploited this privileged execution context to allow crafted HTML pages to manipulate URL handling behavior, effectively enabling attackers to navigate to arbitrary destinations regardless of the intended security restrictions. This represents a classic case of privilege escalation through improper input validation and sanitization.
The operational impact of this vulnerability extends beyond simple navigation bypasses as it fundamentally undermines the security model of web browsers by allowing remote code execution through carefully crafted HTML content. Attackers could leverage this flaw to redirect users to malicious websites, inject harmful content, or perform phishing attacks without user interaction. The vulnerability particularly affects scenarios where DevTools are accessible to untrusted users or when applications use Chrome's DevTools for debugging purposes in environments where security restrictions are intended to prevent unauthorized access to sensitive resources. This weakness aligns with CWE-20, which addresses improper input validation, and demonstrates how seemingly benign features can create security risks when not properly secured.
From a threat modeling perspective, this vulnerability enables adversaries to perform navigation-based attacks that could lead to more serious security incidents. The attack surface expands when considering that DevTools are often used in development environments where they may be accessible to multiple users or where debugging sessions might be shared. The flaw creates opportunities for attackers to manipulate browser behavior through HTML injection techniques that exploit the trust relationship between the DevTools interface and the underlying browser engine. Security practitioners should note that this vulnerability highlights the importance of securing browser developer tools interfaces, as these components often operate with elevated privileges and can be leveraged for privilege escalation attacks.
Mitigation strategies for CVE-2018-6112 primarily focus on updating to Chrome version 66.0.3359.117 or later, which includes patches that address the URL handling and styling validation issues within DevTools. Organizations should implement comprehensive browser update policies to ensure all systems are running patched versions. Additionally, security configurations should restrict access to DevTools interfaces in production environments where possible, and organizations should monitor for suspicious HTML content that might attempt to exploit similar vulnerabilities. The fix implemented by Google addresses the core issue by strengthening input validation and sanitization within the DevTools rendering pipeline, preventing the manipulation of URL click handlers and styling properties that could be used for navigation bypass attacks. This vulnerability also reinforces the need for regular security assessments of browser developer tools interfaces, as these components often serve as attack vectors due to their privileged execution contexts and elevated access to browser functionality.