CVE-2012-4010 in Web Browser
Summary
by MITRE
Opera before 11.60 allows remote attackers to spoof the address bar via unspecified homograph characters, a different vulnerability than CVE-2010-2660.
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Analysis
by VulDB Data Team • 04/23/2019
The vulnerability identified as CVE-2012-4010 represents a significant security flaw in Opera web browsers prior to version 11.60, specifically related to address bar spoofing through the manipulation of homograph characters. This issue exploits the browser's handling of internationalized domain names and character encoding, creating a deceptive user interface that can mislead users about the actual website they are visiting. The vulnerability operates by leveraging the visual similarity of characters from different Unicode scripts that appear identical or nearly identical to the human eye, thereby enabling attackers to craft domain names that visually mimic legitimate websites.
Homograph attacks exploit the fundamental challenge of Unicode character representation where different scripts contain characters that look identical or very similar. In this case, the vulnerability allows attackers to register or manipulate domain names using characters from different Unicode blocks that render identically in the browser's address bar. The flaw specifically affects how Opera processes and displays domain names containing these homograph characters, creating a scenario where users cannot distinguish between legitimate and malicious sites based on visual inspection alone. This type of vulnerability falls under the CWE-1004 category of Weaknesses in the Use of Unicode Character Sets, specifically addressing the improper handling of internationalized domain names.
The operational impact of this vulnerability extends beyond simple deception, as it fundamentally undermines user trust in the browser's security indicators. When users see what appears to be a legitimate website address in the address bar, they may unknowingly interact with malicious content, potentially leading to credential theft, financial fraud, or malware distribution. The attack vector is particularly insidious because it leverages the natural human tendency to trust visual cues without deeper verification. Users may not notice the subtle differences in character encoding that distinguish the malicious site from the legitimate one, especially when the spoofed domain name contains a mix of Latin and non-Latin characters that appear visually identical. This vulnerability directly impacts the browser's security model and user confidence in the authenticity of web addresses.
Security mitigations for CVE-2012-4010 primarily involve updating to Opera version 11.60 or later, which implements proper Unicode normalization and character validation for domain name display. Organizations should also consider implementing additional security measures such as DNS-based security solutions, web application firewalls, and user education programs about the risks of visual spoofing attacks. The vulnerability demonstrates the importance of proper internationalization handling in security-critical applications and aligns with ATT&CK technique T1071.004 for application layer protocol: DNS, where attackers manipulate domain name resolution to create deceptive browsing experiences. Browser vendors should implement strict validation of domain names against known homograph attack patterns and ensure consistent display of internationalized domain names across different character sets to prevent similar vulnerabilities from emerging in the future.