CVE-2018-4134 in iOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 11.3 is affected. The issue involves the "Safari" component. It allows remote attackers to spoof the user interface via a crafted web site.
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Analysis
by VulDB Data Team • 02/06/2021
The vulnerability identified as CVE-2018-4134 represents a significant security flaw within Apple's Safari web browser implementation on iOS devices running versions prior to 11.3. This issue specifically targets the user interface rendering mechanisms of Safari, creating a potential attack vector that could deceive users into believing they are interacting with legitimate web content while actually encountering maliciously crafted interfaces. The vulnerability resides within the browser's handling of web page elements and their visual presentation, particularly affecting how interface components are displayed and interpreted by users. Security researchers have classified this as a user interface spoofing vulnerability that could be exploited by remote attackers without requiring any user interaction beyond visiting a malicious website. The flaw stems from insufficient validation and sanitization of web content that influences the visual presentation layer of the browser, allowing attackers to manipulate the appearance of web pages in ways that could mislead users about the actual source and nature of the content they are viewing.
The technical implementation of this vulnerability involves the manipulation of web page elements that control the browser's user interface presentation, including but not limited to address bar spoofing, tab bar manipulation, and other visual deception techniques. Attackers can craft malicious websites that present false interface elements designed to mimic legitimate browser components or trusted websites, potentially leading users to unknowingly enter sensitive information or perform actions they would not normally undertake. This type of vulnerability falls under the broader category of UI redressing attacks and can be categorized as a CWE-611 Improper Restriction of XML External Entity Reference, though specifically manifested within the browser's rendering engine. The attack vector operates entirely through web-based content delivery, requiring no local exploitation or device compromise, making it particularly dangerous as it can be delivered through email attachments, malicious links, or compromised websites that users might legitimately visit.
The operational impact of CVE-2018-4134 extends beyond simple visual deception, potentially enabling more sophisticated attacks such as credential harvesting, phishing attempts, and social engineering campaigns that leverage the user's trust in familiar browser interfaces. Users may be tricked into believing they are on legitimate banking, social media, or corporate websites when they are actually interacting with attacker-controlled content that mimics these interfaces. This vulnerability particularly affects mobile users who rely heavily on Safari for web browsing, as the attack can occur without any additional software installation or device modification. The implications are significant for enterprise security, as employees using iOS devices for work-related activities could be targeted through spear-phishing campaigns that exploit this vulnerability. Organizations with BYOD policies or those requiring mobile browser access for business operations face increased risk of data breaches and unauthorized access to sensitive corporate information.
Mitigation strategies for CVE-2018-4134 primarily focus on immediate system updates and user education. Apple addressed this vulnerability through iOS 11.3, which included patches to the Safari browser's rendering engine and enhanced validation of web content presentation elements. Organizations should implement comprehensive patch management procedures to ensure all iOS devices are updated to version 11.3 or later, as this represents the most effective defense against exploitation. Network administrators should consider implementing web filtering solutions and browser security extensions that can detect and block suspicious interface manipulation attempts. Users should be educated about the importance of verifying website authenticity through visual indicators and URL inspection, as well as being aware of the risks associated with visiting untrusted websites. Additionally, security monitoring should include detection of unusual browser behavior patterns that might indicate UI spoofing attempts, and organizations should consider implementing security awareness training programs that specifically address social engineering techniques leveraging browser interface vulnerabilities. The ATT&CK framework categorizes this vulnerability under T1056.001 Credential Access: Input Capture, as it can facilitate unauthorized information collection through deceptive user interface manipulation that leads to credential disclosure or other sensitive data compromise.