CVE-2014-8840

Vulnerability

The iTunes Store component in Apple iOS versions prior to 8.1.3 contains a flaw that allows remote attackers to bypass the Safari sandbox protection mechanism. The issue resides in the implicit trust of sites that offer URL redirection services; when an SSL URL is redirected to the iTunes Store, the sandbox boundary can be crossed. This affects iPhone 4s and later, iPod touch (5th generation) and later, and iPad 2 and later [1][2].

Exploitation

An attacker can exploit this vulnerability by hosting a malicious web page or file that initiates an SSL URL redirection to the iTunes Store. User interaction is required, as the target must visit the malicious page or open the malicious file. No authentication is needed beyond the user's action [2].

Impact

Successful exploitation allows the attacker to execute code outside the context of the Safari sandbox, effectively escalating privileges. This could lead to unauthorized access to sensitive data (information disclosure) and potentially allow arbitrary code execution on the device, compromising confidentiality, integrity, and availability [2].

Mitigation

Apple addressed this vulnerability in iOS 8.1.3 by adding additional checks to prevent the improper redirection. The update was released on January 27, 2015. Users should update to iOS 8.1.3 or later via the Software Update mechanism. There is no known workaround for unpatched versions [1][2].