CVE-2018-6145 in Chrome
Summary
by MITRE
Insufficient data validation in HTML parser in Google Chrome prior to 67.0.3396.62 allowed a remote attacker to bypass same origin policy via a crafted HTML page.
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Analysis
by VulDB Data Team • 07/18/2024
The vulnerability identified as CVE-2018-6145 represents a critical security flaw in Google Chrome's HTML parser implementation that existed prior to version 67.0.3396.62. This issue stems from inadequate data validation mechanisms within the browser's parsing logic, creating a pathway for malicious actors to exploit fundamental web security controls. The vulnerability specifically targets the same origin policy enforcement mechanism that serves as a cornerstone of web browser security architecture, effectively allowing unauthorized access to resources that should be restricted based on domain boundaries.
The technical flaw manifests in how Chrome's HTML parser processes malformed or crafted HTML content that contains embedded JavaScript or other malicious constructs. When the parser encounters such content, it fails to properly validate the data structure and context, enabling attackers to craft HTML pages that can manipulate the browser's security model. This validation failure occurs during the parsing phase where the browser should be enforcing strict boundaries between different origins, but instead permits cross-origin access through carefully constructed malicious payloads. The vulnerability operates at the parser level rather than at the application level, making it particularly insidious as it can bypass traditional security mechanisms that rely on proper input validation.
The operational impact of this vulnerability extends beyond simple data theft or unauthorized access. Attackers can leverage this weakness to execute cross-site scripting attacks, steal session cookies, access sensitive user data, and potentially escalate privileges within the browser environment. The ability to bypass same origin policy fundamentally undermines the security model that protects users from malicious websites, as it allows attackers to access resources from different domains that should be isolated from each other. This creates a vector for sophisticated attacks including credential theft, data exfiltration, and privilege escalation within the browser sandbox. The vulnerability affects all users of affected Chrome versions and can be exploited through standard web browsing activities without requiring any special user interaction beyond visiting a malicious website.
Security mitigations for CVE-2018-6145 primarily involve updating to Chrome version 67.0.3396.62 or later, which includes enhanced HTML parser validation mechanisms and improved data sanitization routines. Organizations should implement comprehensive patch management strategies to ensure all affected systems receive the necessary updates promptly. Browser vendors and security teams should also consider implementing additional monitoring for suspicious parsing behaviors and network traffic patterns that might indicate exploitation attempts. This vulnerability aligns with CWE-20, which describes inadequate input validation as a fundamental weakness in software security. From an attack perspective, this issue maps to ATT&CK technique T1059.001 for executing malicious code through web browsers and T1566 for initial access via malicious websites. The remediation process requires not only updating the browser but also educating users about the importance of keeping their software current and avoiding suspicious websites. Organizations should also implement web application firewalls and content security policies to add additional layers of protection against similar vulnerabilities that might exist in other components of their web infrastructure.