CVE-2020-7369 in Yandex
Summary
by MITRE • 10/21/2020
User Interface (UI) Misrepresentation of Critical Information vulnerability in the address bar of the Yandex Browser allows an attacker to obfuscate the true source of data as presented in the browser. This issue affects the Yandex Browser version 20.8.3 and prior versions, and was fixed in version 20.8.4 released October 1, 2020.
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Analysis
by VulDB Data Team • 11/22/2020
This vulnerability represents a critical user interface misrepresentation flaw that undermines the fundamental security assurances provided by web browsers. The issue specifically targets the address bar functionality within the Yandex Browser, which serves as the primary interface for users to verify the authenticity and origin of web resources. When exploited, this vulnerability allows attackers to manipulate the visual presentation of URL information, creating deceptive user experiences that can lead to successful phishing attacks and social engineering campaigns. The flaw essentially enables malicious actors to make the browser display misleading information about the source of data, potentially causing users to trust fraudulent websites that appear legitimate.
The technical implementation of this vulnerability stems from insufficient validation and sanitization of URL components within the browser's address bar rendering system. This type of flaw falls under the CWE-693 category of Protection Mechanism Failure, where security mechanisms fail to provide the expected level of protection. The vulnerability exploits the trust users place in visual indicators provided by the browser interface, specifically targeting the critical element that should unequivocally identify the website's origin. Attackers can leverage this weakness to craft URLs that appear to originate from trusted domains while actually directing users to malicious sites, bypassing traditional security measures that rely on user verification of address bar content. The root cause likely involves inadequate input validation processes that fail to properly handle special characters, encoding sequences, or domain name representations that could be manipulated to create misleading visual displays.
The operational impact of this vulnerability extends far beyond simple user confusion, representing a significant threat to cybersecurity hygiene and user safety. Users interacting with the affected browser version may unknowingly submit sensitive information to fraudulent websites, as the address bar fails to accurately represent the true source of the content they are viewing. This creates an environment where phishing attacks become significantly more effective, as the visual deception makes it difficult for users to distinguish between legitimate and malicious sites. The vulnerability particularly impacts users who rely on browser-based security indicators for decision-making processes, potentially leading to credential theft, financial fraud, and data breaches. Organizations using the affected browser version face increased risk of successful social engineering attacks, as the compromised interface removes a critical layer of user verification that should protect against such threats.
Mitigation strategies for this vulnerability should include immediate deployment of the patched version 20.8.4 released on October 1, 2020, which addresses the underlying UI rendering issues in the address bar functionality. Security administrators should implement comprehensive browser security policies that include regular update management procedures and automated patch deployment systems. Additional protective measures involve user education about the importance of verifying website authenticity through multiple indicators beyond just the address bar, including checking for valid SSL certificates and examining URL structure for suspicious elements. Organizations should consider implementing browser hardening configurations that enforce stricter validation of URL components and monitor for unusual address bar behavior. This vulnerability aligns with ATT&CK technique T1566.001 related to spearphishing attachments and T1566.002 for spearphishing links, as it enables more effective delivery of malicious content through deceptive user interface presentation that bypasses normal security awareness. The fix implemented in version 20.8.4 likely involved enhanced input validation for URL components and improved rendering mechanisms that ensure the address bar accurately reflects the true source of web content.