CVE-2016-1779 in iOS
Summary
by MITRE
WebKit in Apple iOS before 9.3 and Safari before 9.1 allows remote attackers to bypass the Same Origin Policy and obtain physical-location data via a crafted geolocation request.
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Analysis
by VulDB Data Team • 07/11/2022
The vulnerability identified as CVE-2016-1779 represents a critical security flaw in Apple's WebKit rendering engine that affected iOS versions prior to 9.3 and Safari versions before 9.1. This weakness resides in the browser's implementation of the Same Origin Policy, which serves as a fundamental security mechanism designed to prevent unauthorized access to resources across different domains. The Same Origin Policy is a core security principle defined by web standards and operates under the assumption that scripts from different origins should not be able to access each other's resources, thereby protecting user privacy and data integrity. The flaw in WebKit's implementation created a pathway for malicious actors to circumvent these protective measures.
The technical nature of this vulnerability stems from improper handling of geolocation requests within the WebKit engine's security model. When users interacted with web pages containing maliciously crafted geolocation requests, the browser failed to properly enforce the Same Origin Policy restrictions that should have prevented cross-origin access to location data. This allowed attackers to exploit a logic flaw in how the browser processed geolocation API calls, enabling them to obtain physical location information from users without their explicit consent. The vulnerability specifically targeted the geolocation API implementation, which is designed to provide location services to web applications while maintaining strict security boundaries. The flaw was classified as a privilege escalation issue within the context of web security, as it allowed unprivileged web content to access sensitive location data that should have been restricted to trusted applications or user-approved contexts.
The operational impact of CVE-2016-1779 was significant as it represented a direct threat to user privacy and location security across millions of iOS devices and Safari users. Attackers could leverage this vulnerability to perform location-based reconnaissance without user knowledge, potentially enabling targeted attacks, stalking, or unauthorized tracking. The implications extended beyond simple privacy concerns to encompass potential security breaches where location data could be combined with other personal information to create detailed profiles of users. This vulnerability particularly affected users in high-risk environments where location data could be used for malicious purposes such as financial fraud, identity theft, or physical security threats. The exploitability of this flaw was enhanced by the fact that it required no special privileges or user interaction beyond visiting a malicious website, making it particularly dangerous in phishing campaigns or malicious advertising networks.
Security mitigations for CVE-2016-1779 focused primarily on updating to patched versions of iOS and Safari where Apple had corrected the WebKit implementation. The fix involved strengthening the Same Origin Policy enforcement mechanisms within the geolocation API and ensuring proper validation of cross-origin requests. Organizations and users were advised to immediately apply the relevant security updates to prevent exploitation. This vulnerability aligns with CWE-284, which describes improper access control, and demonstrates how failures in access control mechanisms can lead to unauthorized information disclosure. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and information gathering, specifically targeting the collection of location-based intelligence. The incident highlighted the importance of robust security testing for web rendering engines and the critical need for proper implementation of security policies in browser components. This vulnerability also reinforced the necessity of continuous security monitoring and rapid patch deployment processes to protect users against emerging threats in mobile and web environments.