CVE-2005-0234 in Safari
Summary
by MITRE
The International Domain Name (IDN) support in Safari 1.2.5 allows remote attackers to spoof domain names using punycode encoded domain names that are decoded in URLs and SSL certificates in a way that uses homograph characters from other character sets, which facilitates phishing attacks.
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Analysis
by VulDB Data Team • 06/20/2024
The vulnerability described in CVE-2005-0234 represents a critical security flaw in Safari 1.2.5's handling of International Domain Name support, specifically exposing users to sophisticated phishing attacks through deceptive domain name presentation. This issue emerged from the browser's inadequate implementation of punycode encoding standards when processing internationalized domain names, creating a pathway for attackers to exploit character set differences in domain name representation.
The technical flaw resides in Safari's improper decoding of punycode encoded domain names within URLs and SSL certificates, where the browser fails to properly distinguish between legitimate international domain names and maliciously crafted homograph characters from different character sets. When users encounter domain names containing characters from multiple scripts such as latin, cyrillic, or other unicode character sets, the browser's display mechanism can present visually identical or nearly identical characters that originate from different Unicode code points, creating a false sense of legitimacy in the domain name.
This vulnerability directly enables phishing attacks by allowing attackers to register domain names that appear identical or nearly identical to legitimate websites but contain different Unicode characters that are visually indistinguishable from standard latin characters. The operational impact is severe as users may be tricked into believing they are visiting trusted websites when they are actually interacting with malicious domains that exploit the visual similarity of international character sets.
The security implications extend beyond simple visual deception to encompass the fundamental trust model of web browsing and SSL certificate validation. When SSL certificates are presented with misleading domain names, users cannot properly verify the authenticity of connections, undermining the entire public key infrastructure that secure web communications rely upon. This vulnerability demonstrates a failure in the browser's user interface security design and highlights the critical importance of proper internationalization handling in security-sensitive applications.
Organizations and security professionals should implement multiple mitigations including browser updates to versions with proper IDN handling, user education about recognizing potential phishing attempts, and network-level monitoring for suspicious domain name patterns. The issue also underscores the need for adherence to established security standards such as those defined in CWE-1011 which addresses issues related to internationalization and Unicode handling in security contexts. Additionally, this vulnerability aligns with ATT&CK technique T1566 which covers social engineering through phishing, demonstrating how technical implementation flaws can be exploited to create effective attack vectors. The remediation process should include comprehensive testing of international domain name handling, implementation of proper character set validation, and ensuring that browsers properly display the underlying punycode representation alongside any visual domain name presentation to maintain user awareness of the actual domain being accessed.