CVE-2015-5925

Vulnerability

The vulnerability resides in the CoreGraphics component of Apple iOS (before 9.1), OS X (before 10.11.1), and watchOS (before 2.0.1). It is triggered when a user visits a crafted website that exploits a memory corruption issue, leading to arbitrary code execution or denial of service. This is a different vulnerability than CVE-2015-5926, as noted in the official description [1][2][3].

Exploitation

An attacker must host or inject a maliciously crafted website and induce the victim to visit it via a web browser. No additional privileges or authentication are required; the attack is remote and user interaction is limited to the victim browsing to the site. The exploit leverages the memory corruption in CoreGraphics to alter program execution.

Impact

Successful exploitation allows an attacker to execute arbitrary code in the context of the affected application (likely Safari or other web content renderers) or cause a denial of service via system memory corruption. This could lead to full compromise of the device's data and functionality, or temporary unavailability.

Mitigation

Apple released fixes in iOS 9.1, OS X El Capitan 10.11.1 (and corresponding security updates for Yosemite and Mavericks), and watchOS 2.0.1 on October 21, 2015. Users should update to these versions. No workarounds are documented; the only mitigation is installing the available patches [1][2][3].