CVE-2018-4274 in Safari
Summary
by MITRE
A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, Safari 11.1.2.
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Analysis
by VulDB Data Team • 03/01/2020
The vulnerability identified as CVE-2018-4274 represents a URL spoofing flaw that emerged in Apple's iOS and Safari browser implementations prior to specific security updates. This issue falls under the broader category of web application security weaknesses where malicious actors could exploit the improper handling of URL structures to deceive users into believing they were visiting legitimate websites when in fact they were navigating to potentially harmful destinations. The flaw specifically manifested in how the affected systems processed and displayed web addresses, creating opportunities for social engineering attacks that could bypass user trust mechanisms.
The technical implementation of this vulnerability stemmed from insufficient input validation mechanisms within the URL parsing and rendering components of Apple's web browsing infrastructure. When users encountered web pages containing specially crafted URLs, the system failed to properly sanitize or verify the authenticity of the address before displaying it to the user interface. This weakness allowed attackers to construct deceptive URLs that would appear legitimate to users while actually directing them to malicious endpoints. The vulnerability was particularly concerning because it exploited the fundamental trust users place in browser address bars and URL displays, making it an effective vector for phishing attacks and credential theft operations.
The operational impact of CVE-2018-4274 extended beyond simple user deception to potentially enable more sophisticated attack scenarios including credential harvesting, malware distribution, and financial fraud. Users who encountered spoofed URLs could unknowingly submit sensitive information to attacker-controlled servers, believing they were interacting with trusted websites. The vulnerability affected a significant user base given that iOS 11.4.1 and Safari 11.1.2 were widely deployed versions, making the attack surface substantial across Apple's ecosystem. Security researchers noted that this flaw could be particularly dangerous in enterprise environments where users might be more trusting of system prompts and less likely to question website authenticity.
Apple addressed this vulnerability through enhanced input validation mechanisms that improved URL parsing and rendering processes to prevent the display of misleading web addresses. The fix implemented in iOS 11.4.1 and Safari 11.1.2 included stricter validation of URL components and enhanced sanitization of address bar content to ensure that users could accurately identify the true destination of web links. This remediation aligns with common security practices outlined in the CWE database under category 1004 which addresses weak input validation issues. Organizations should consider implementing additional browser security measures including content security policies, extended validation certificates, and user education programs to further mitigate risks associated with URL spoofing attacks. The vulnerability also relates to ATT&CK technique T1566 which covers spearphishing with links, highlighting the importance of comprehensive email security and user awareness training programs.