CVE-2012-1929 in Web Browser
Summary
by MITRE
Opera before 11.62 on Mac OS X allows remote attackers to spoof the address field and security dialogs via crafted styling that causes page content to be displayed outside of the intended content area.
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Analysis
by VulDB Data Team • 03/22/2021
This vulnerability resides in Opera web browser versions prior to 11.62 on Mac OS X systems and represents a sophisticated user interface spoofing attack that exploits the browser's rendering engine to manipulate visual presentation elements. The flaw specifically targets the address bar and security dialog components, which are critical security mechanisms designed to provide users with essential information about the website they are visiting and the security status of their connection. Attackers can craft malicious web pages with carefully constructed CSS styling that causes content to overflow from its designated boundaries and overlay critical interface elements, effectively creating a deceptive user experience that mimics legitimate browser security warnings.
The technical implementation of this vulnerability leverages cascading style sheet properties that allow attackers to manipulate the visual positioning and display characteristics of web elements. By utilizing CSS techniques such as absolute positioning, z-index manipulation, and overflow properties, malicious actors can force page content to appear in areas where it should not be visible, particularly in regions adjacent to or overlapping the address bar and security indicators. This type of attack falls under the category of user interface deception and specifically relates to CWE-691, which addresses insufficient control of a resource's visibility or accessibility. The vulnerability demonstrates how seemingly benign styling capabilities can be weaponized to create misleading visual interfaces that can deceive even technically savvy users.
The operational impact of this vulnerability extends beyond simple visual deception to potentially enable more serious attacks such as phishing and credential theft. When users see what appears to be a legitimate security dialog or address bar, they may unknowingly interact with malicious content that has been disguised to look authentic. This spoofing capability can be particularly dangerous when combined with other attack vectors, as it removes one of the primary user verification mechanisms that browsers rely on to maintain security trust. The attack scenario becomes more plausible when considering that users often trust the visual appearance of browser elements and may not notice subtle discrepancies in the positioning or styling of interface components, especially when such discrepancies are carefully crafted to appear legitimate.
The mitigation strategies for this vulnerability primarily involve updating to Opera version 11.62 or later, which includes patches that address the CSS rendering behavior that enables the spoofing attack. Browser vendors typically implement fixes through enhanced content security policies that prevent malicious styling from affecting critical interface elements, along with stricter enforcement of visual boundaries for security-related components. From an enterprise security perspective, organizations should maintain updated browser installations and consider implementing additional security measures such as network-based filtering and user education about the importance of verifying URL authenticity. The vulnerability also highlights the broader importance of addressing UI security concerns within web browsers, as demonstrated by ATT&CK technique T1056.001 which covers input injection attacks that can manipulate user interface elements to deceive users into performing unintended actions.