CVE-2020-6500 in Chrome
Summary
by MITRE
Inappropriate implementation in interstitials in Google Chrome prior to 80.0.3987.87 allowed a remote attacker to spoof the contents of the Omnibox (URL bar) via a crafted HTML page.
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Analysis
by VulDB Data Team • 06/04/2020
The vulnerability identified as CVE-2020-6500 represents a critical security flaw in Google Chrome's handling of interstitial pages that occurred before version 80.0.3987.87. This issue stems from an improper implementation of how Chrome displays warning and information pages to users, specifically affecting the Omnibox or URL bar functionality. The vulnerability operates at the intersection of browser security mechanisms and user interface presentation, creating a potential attack vector where malicious actors could manipulate the visual representation of web addresses displayed to users.
The technical flaw manifests through the inadequate validation and rendering of interstitial content within Chrome's user interface. When a web page triggers an interstitial warning or information display, the browser should maintain proper separation between the actual URL and the warning content to prevent user confusion. However, this vulnerability allowed attackers to craft HTML pages that could manipulate how the Omnibox appeared to users, potentially displaying misleading information that could confuse users about the actual website they were visiting. The flaw specifically targeted the visual presentation layer rather than the underlying security mechanisms, making it particularly dangerous as it could deceive users without triggering traditional security warnings.
The operational impact of this vulnerability extends beyond simple visual deception to potentially enable sophisticated phishing attacks and social engineering campaigns. Attackers could exploit this flaw to make malicious websites appear as legitimate ones by manipulating the URL bar display, thereby undermining user trust and browser security. This capability could lead to successful credential theft, financial fraud, or other malicious activities where users are tricked into believing they are interacting with trusted websites. The vulnerability's remote nature means it could be exploited through standard web browsing without requiring additional user interaction beyond visiting a malicious page.
Mitigation strategies for CVE-2020-6500 primarily focus on updating to Chrome version 80.0.3987.87 or later, which contains the necessary patches to address the improper interstitial implementation. Organizations should also implement comprehensive browser security policies that include regular update scheduling and monitoring for vulnerable software versions. Network administrators should consider deploying additional security layers such as web application firewalls and content filtering solutions to provide defense in depth. The vulnerability aligns with CWE-200, which addresses information exposure, and relates to ATT&CK technique T1566 for spearphishing attacks, as it enables more convincing social engineering campaigns. Users should be educated about recognizing potential phishing attempts and the importance of verifying website authenticity through multiple means beyond URL bar appearance.