CVE-2016-4075 in Mini
Summary
by MITRE
Opera Mini 13 and Opera Stable 36 allow remote attackers to spoof the displayed URL via a crafted HTML document, related to the about:blank URL.
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Analysis
by VulDB Data Team • 12/21/2020
The vulnerability identified as CVE-2016-4075 represents a significant web browser security flaw affecting Opera Mini 13 and Opera Stable 36 versions. This issue enables remote attackers to manipulate the URL display mechanism within the browser's user interface, creating a deceptive environment where users cannot accurately determine the true destination of web content. The vulnerability specifically exploits the handling of about:blank URLs, which are typically used as placeholder or default pages in web browsers. When a maliciously crafted HTML document is loaded, the browser's URL display logic becomes compromised, allowing attackers to present false URL information to users while they navigate through web content.
The technical implementation of this vulnerability stems from insufficient validation and sanitization of URL display parameters within Opera's rendering engine. When the browser encounters a crafted HTML document that manipulates the about:blank URL handling, it fails to properly verify the authenticity of the displayed URL against the actual content being rendered. This discrepancy creates an opportunity for attackers to exploit the browser's user interface presentation layer, potentially leading to phishing attacks where users are misled about the true origin of web pages. The flaw operates at the application layer of the network stack, specifically affecting the browser's user experience and security indicators that users rely upon for safe navigation.
The operational impact of CVE-2016-4075 extends beyond simple display manipulation, as it fundamentally undermines user trust in browser security warnings and URL verification mechanisms. Attackers can leverage this vulnerability to create convincing phishing scenarios where the displayed URL appears legitimate while the underlying content is malicious. This manipulation directly affects the browser's ability to provide accurate security context to users, potentially leading to credential theft, malware distribution, or financial fraud. The vulnerability particularly affects users who rely on visual URL cues for security assessment, as the deception occurs at the interface level where users expect to see accurate information about their browsing session.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-601 and CWE-79, representing URL redirection issues and cross-site scripting vulnerabilities respectively. The flaw also maps to ATT&CK technique T1059.006 for client-side attacks and T1566 for phishing campaigns. The vulnerability demonstrates the critical importance of browser security boundaries and the need for robust input validation at all levels of web application processing. Organizations and users should prioritize immediate remediation through browser updates, as this type of vulnerability can be exploited in the wild without requiring user interaction beyond visiting a malicious website. The security implications extend to enterprise environments where browser-based attacks represent a primary vector for initial compromise, making this vulnerability particularly dangerous in targeted attack scenarios.
Mitigation strategies should include immediate deployment of updated Opera browser versions that address the URL display validation issue. Security teams should implement browser hardening policies that restrict access to potentially malicious content and monitor for suspicious URL patterns. Network-based protections such as web application firewalls and content filtering systems can help detect and block exploitation attempts. User education remains crucial, emphasizing the importance of verifying URL authenticity through multiple means beyond visual inspection. Organizations should also consider implementing browser security extensions and monitoring tools that can detect anomalous URL behavior patterns. The vulnerability underscores the necessity of regular security assessments and patch management processes to prevent exploitation of similar browser-level vulnerabilities that could compromise user security and trust in digital environments.