CVE-2023-3734 in Chrome
Summary
by MITRE • 08/02/2023
Inappropriate implementation in Picture In Picture in Google Chrome prior to 115.0.5790.98 allowed a remote attacker to potentially spoof the contents of the Omnibox (URL bar) via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 08/09/2023
This vulnerability resides in the Picture-in-Picture functionality of Google Chrome, specifically affecting versions prior to 115.0.5790.98. The issue stems from an inadequate implementation that fails to properly validate or sanitize content displayed within the Picture-in-Picture window, creating a potential vector for malicious actors to manipulate the user interface elements. The vulnerability is categorized under CWE-20, which represents improper input validation, and falls within the broader category of UI redressing or user interface spoofing attacks. The Picture-in-Picture feature allows users to watch videos in a floating window while browsing other content, but this implementation flaw creates a security gap where attacker-controlled content could potentially override or mimic legitimate browser interface elements.
The technical flaw manifests when a malicious website crafts an HTML page that exploits the Picture-in-Picture API to display content that appears to originate from the browser's Omnibox or URL bar. This spoofing capability enables attackers to present false information to users who might be tricked into believing they are interacting with legitimate browser elements. The vulnerability operates at the intersection of web platform APIs and browser security boundaries, where the Picture-in-Picture window does not adequately separate or validate the authenticity of content being displayed. This issue directly relates to the ATT&CK technique T1531, which involves tampering with security tools and system processes, as it undermines the trust model between the browser and its user interface components.
The operational impact of this vulnerability extends beyond simple visual deception, as it can be leveraged in phishing attacks or social engineering campaigns where attackers attempt to manipulate user behavior by presenting false URL information. Users interacting with malicious websites could be misled into believing they are visiting legitimate domains, potentially leading to credential theft or other malicious activities. The medium severity classification indicates that while exploitation requires specific conditions and user interaction, the potential for abuse is significant enough to warrant immediate attention. The vulnerability demonstrates how seemingly benign browser features can introduce security risks when not properly implemented with security considerations in mind, particularly regarding the isolation and validation of content displayed in floating windows.
Mitigation strategies include updating to Chrome version 115.0.5790.98 or later, where the implementation has been corrected to properly validate and isolate content within Picture-in-Picture windows. Security teams should also implement monitoring for suspicious website behavior and user interactions with Picture-in-Picture functionality. The fix likely involves strengthening input validation mechanisms and ensuring proper sandboxing of Picture-in-Picture content to prevent unauthorized access to or manipulation of browser interface elements. Organizations should consider implementing browser hardening policies and user education programs to reduce the risk of exploitation, as this vulnerability requires user interaction with malicious content to be effective. Additionally, the incident highlights the importance of thorough security testing for browser features that interact with user interface components and the need for proper validation of all content displayed in floating or overlay windows.