CVE-2018-18346 in Chrome
Summary
by MITRE
Incorrect handling of alert box display in Blink in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to present confusing browser UI via a crafted HTML page.
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Analysis
by VulDB Data Team • 06/18/2023
The vulnerability identified as CVE-2018-18346 represents a critical flaw in the Blink rendering engine that powers Google Chrome and other Chromium-based browsers. This issue stems from improper handling of alert box display mechanisms within the browser's user interface subsystem, creating a potential vector for malicious actors to manipulate user experience and potentially deceive end users. The flaw exists specifically in versions prior to Chrome 71.0.3578.80, making a significant portion of the browser user base susceptible to exploitation. The vulnerability falls under the category of user interface manipulation attacks, where an attacker can craft malicious HTML content to display misleading or confusing browser interface elements that could confuse users about their actual browser state or security context.
The technical implementation of this vulnerability involves the manipulation of JavaScript alert dialogs and related user interface components that are typically used for security warnings and user notifications. When a malicious webpage loads with crafted HTML content, the Blink engine fails to properly validate or sanitize the alert box parameters, allowing attackers to present interface elements that appear legitimate but contain misleading information. This flaw operates at the intersection of browser security and user experience design, exploiting the trust users place in standard browser alert mechanisms. The vulnerability can be leveraged to create confusing situations where users might be misled about the security status of their browser or the legitimacy of their current browsing session, potentially leading to social engineering attacks or user confusion that could be exploited in conjunction with other malicious activities.
The operational impact of this vulnerability extends beyond simple user interface manipulation to potentially enable more sophisticated attacks through social engineering. Attackers could craft pages that display fake security warnings, misleading authentication prompts, or false browser status indicators to trick users into performing actions they would not normally take. This type of attack aligns with tactics described in the attack pattern taxonomy under techniques such as user interface deception and phishing attacks. The vulnerability could be particularly dangerous in environments where users might be targeted for credential theft or other malicious activities, as the confusion created by the manipulated alert boxes could prevent users from recognizing that they are being deceived. Security researchers have categorized this as a medium to high severity issue due to its potential for abuse in phishing campaigns and other deceptive practices that leverage user trust in browser security indicators.
Mitigation strategies for CVE-2018-18346 primarily focus on updating to patched versions of Google Chrome, specifically version 71.0.3578.80 or later, where the alert box handling has been corrected. Organizations should implement robust patch management procedures to ensure all browser installations are updated promptly. Additional defensive measures include deploying web application firewalls that can detect and block malicious HTML content, implementing browser security policies that restrict alert box usage, and conducting regular security awareness training for users to help them recognize potentially deceptive browser interface elements. The vulnerability also highlights the importance of proper input validation and sanitization in browser rendering engines, as outlined in common weakness enumeration standards. Security teams should monitor for similar issues in other browser components and maintain updated threat intelligence to identify potential exploitation attempts targeting user interface manipulation vulnerabilities.