CVE-2023-42973 in iOS
Summary
by MITRE • 04/11/2025
Private Browsing tabs may be accessed without authentication. This issue is fixed in iOS 17 and iPadOS 17. The issue was addressed with improved UI.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/22/2025
This vulnerability represents a critical authentication bypass flaw in Apple's private browsing functionality affecting iOS and iPadOS versions prior to 17. The technical flaw stems from inadequate session management and user interface controls that allow unauthorized access to private browsing tabs through specific navigation sequences. The vulnerability falls under CWE-284 Access Control Issues, specifically related to improper privileges management where the system fails to properly enforce authentication requirements for accessing sensitive browsing contexts. The issue demonstrates a breakdown in the security model that should ensure private browsing sessions remain isolated and protected from unauthorized access by other users or processes. This represents a fundamental failure in the application's privilege escalation controls and session isolation mechanisms.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential data leakage and unauthorized access to sensitive information. Attackers could exploit this weakness to access private browsing sessions containing confidential communications, financial data, personal information, or corporate secrets that users expect to remain protected within private browsing contexts. The vulnerability is particularly concerning because private browsing tabs are designed to provide users with enhanced privacy protections, including preventing tracking, maintaining session isolation, and ensuring that browsing activities remain inaccessible to other users of the same device. The flaw undermines the core security assumptions of the private browsing feature and creates potential attack vectors for information disclosure and privacy violations.
The mitigation strategy for this vulnerability involves implementing enhanced user interface controls and session management mechanisms that properly enforce authentication requirements for accessing private browsing contexts. Apple addressed this issue through UI improvements that ensure proper session isolation and authentication enforcement when accessing private browsing tabs. The fix demonstrates the importance of proper access control implementation in mobile operating systems and highlights the need for comprehensive security testing of privacy features. Organizations should ensure all devices are updated to iOS 17 and iPadOS 17 to remediate this vulnerability. The solution aligns with ATT&CK technique T1566 Credential Access through social engineering and T1078 Valid Accounts by ensuring proper authentication enforcement. This vulnerability underscores the critical importance of access control mechanisms in privacy-sensitive applications and the necessity of thorough security testing of user interface components that handle sensitive data access. The remediation approach emphasizes the integration of security controls within the application's user experience design rather than relying solely on backend authentication mechanisms.