CVE-2017-7151

Vulnerability

A race condition existed in the validation logic of multiple Apple platforms. This issue affected versions prior to iOS 11.2, macOS High Sierra 10.13.2, tvOS 11.2, watchOS 4.2, iTunes 12.7.2 for Windows, and macOS High Sierra 10.13.4 [1][2][3][4]. The bug could be triggered when concurrent operations were not properly synchronized, allowing an attacker to exploit a timing window.

Exploitation

An attacker in a privileged network position or with local access could exploit the race condition by carefully timing operations to bypass the intended validation checks. The exact sequence of steps is not detailed in the available references, but the vulnerability requires the attacker to win a race window during a security-sensitive operation.

Impact

Successful exploitation could allow an attacker to bypass security checks, potentially leading to unauthorized actions such as information disclosure, privilege escalation, or spoofing of system prompts. The impact varies by platform but could compromise the confidentiality, integrity, or availability of the affected system.

Mitigation

Apple addressed the race condition with additional validation in the following releases: iOS 11.2, macOS High Sierra 10.13.2, tvOS 11.2, watchOS 4.2, iTunes 12.7.2 for Windows, and macOS High Sierra 10.13.4 [1][2][3][4]. Users should update to these or later versions. No workarounds are documented in the available references.