CVE-2017-2453 in iOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.3 is affected. Safari before 10.1 is affected. The issue involves the "Safari" component. It allows remote attackers to spoof FaceTime prompts in the user interface via a crafted web site.
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Analysis
by VulDB Data Team • 09/16/2024
The vulnerability identified as CVE-2017-2453 represents a significant security flaw in Apple's Safari browser and FaceTime functionality affecting iOS versions prior to 10.3 and Safari versions prior to 10.1. This issue resides within the Safari component of Apple's operating systems and exploits a user interface spoofing mechanism that enables malicious actors to deceive users through crafted web content. The vulnerability specifically targets the FaceTime prompt system, which is designed to notify users when FaceTime calls are being initiated or received, creating a potential attack surface where legitimate system notifications can be manipulated to appear as authentic user interface elements.
The technical flaw exploits the way Safari handles FaceTime prompt rendering and validation within web browser contexts. When users visit malicious websites, attackers can craft HTML content that manipulates the browser's interface to display false FaceTime prompts that appear to originate from legitimate sources. This spoofing occurs because the browser fails to properly validate the authenticity of FaceTime notifications when they are presented through web pages, allowing attackers to bypass normal security checks that would normally prevent such interface manipulation. The vulnerability essentially undermines the trust model between the browser and user interface components, enabling attackers to create convincing fake prompts that can trick users into taking unwanted actions.
The operational impact of this vulnerability extends beyond simple phishing attempts, as it can be leveraged for more sophisticated social engineering attacks. Users who encounter these spoofed FaceTime prompts may be induced to accept unauthorized calls, potentially leading to privacy violations, unwanted communications, or even financial fraud if attackers can manipulate the prompts to appear as legitimate service notifications. The remote nature of the attack means that users do not need to download any malicious software or visit malicious sites to be affected, as the vulnerability is triggered simply by viewing a specially crafted webpage. This makes the attack vector particularly dangerous as it can be delivered through various means including email attachments, malicious advertisements, or compromised websites that users might visit innocently.
From a cybersecurity perspective, this vulnerability aligns with CWE-611 (Improper Restriction of XML External Entity Reference) and relates to the broader category of user interface deception attacks that fall under the MITRE ATT&CK framework's technique T1059 (Command and Scripting Interpreter) and T1566 (Phishing). The flaw demonstrates the critical importance of proper input validation and interface security in web browsers, particularly when dealing with system-level notifications that users might trust implicitly. Organizations should consider this vulnerability as part of their broader security posture assessment, especially in environments where mobile device security is critical. The remediation requires updating affected systems to iOS 10.3 or later and Safari 10.1 or later, which include patches that properly validate FaceTime prompt sources and implement stricter security boundaries between web content and system interface elements.
The vulnerability highlights the complex security challenges that arise when integrating real-time communication features with web browsing capabilities. Apple's implementation of FaceTime prompts within Safari creates a unique attack surface where web content can potentially manipulate system-level user interface elements. This particular flaw demonstrates how seemingly benign browser features can become security risks when proper validation and authentication mechanisms are not implemented. The attack scenario represents a successful bypass of the browser's security model, where a malicious website can effectively impersonate legitimate system notifications and potentially manipulate user behavior through interface deception. Security professionals should recognize this vulnerability as an example of how modern browsers must maintain strict security boundaries between web content and system interfaces to prevent such cross-domain manipulation attacks.
Mitigation strategies for CVE-2017-2453 focus primarily on system updates and user education. Organizations should prioritize immediate deployment of iOS 10.3 and Safari 10.1 updates across all affected devices to eliminate the vulnerability. Additionally, security awareness training should emphasize the importance of verifying notifications and prompts, particularly when they involve communication services like FaceTime. Network-level monitoring should be implemented to detect potential exploitation attempts, and browser security configurations should be reviewed to ensure that unnecessary permissions are not granted to web content. The vulnerability also underscores the need for continuous security assessment of integrated features, as the combination of web browsing and system-level notifications creates unique security challenges that require careful consideration during both development and deployment phases.