CVE-2017-7109

Vulnerability

A cross-site scripting (XSS) vulnerability exists in the WebKit component of certain Apple products. The issue lies in the handling of crafted web content that incorrectly interacts with the Application Cache policy, allowing an attacker to inject arbitrary web script or HTML. Affected products include iOS before 11, Safari before 11, tvOS before 11, iCloud before 7.0 on Windows, and iTunes before 12.7 on Windows [1][2][3][4].

Exploitation

An attacker can exploit this vulnerability by convincing a user to view specially crafted web content, such as a malicious webpage. No special network position or authentication is required; the attacker only needs to serve the crafted content to the user via a web browser or application that uses WebKit. The exploit does not require user interaction beyond loading the malicious content [1][2][3][4].

Impact

Successful exploitation allows the attacker to execute arbitrary web script or HTML in the context of the user's browser session. This can lead to information disclosure, session hijacking, or other client-side attacks. The impact is limited to the user's browser environment, but could allow access to session tokens, local storage, or other sensitive data handled by the application [1][2][3][4].

Mitigation

Apple released patches in iOS 11, Safari 11, tvOS 11, iCloud for Windows 7.0, and iTunes for Windows 12.7, all released on or around September 19, 2017 [1][2][3][4]. Users should update to these versions or later to remediate the vulnerability. No workaround is available; applying the security updates is the recommended mitigation.