CVE-2015-5924

Vulnerability

The OpenGL implementation in Apple iOS prior to 9.1 and OS X prior to 10.11.1 contains a memory corruption issue. When processing specially crafted web content, the vulnerability can be triggered remotely without user interaction beyond visiting a malicious website. Affected versions: iOS 8.x and earlier, OS X 10.10.x and earlier (including Mavericks 10.9.5, Yosemite 10.10.5, and El Capitan 10.11). [1][2]

Exploitation

An attacker can exploit this vulnerability by hosting a malicious website that, when visited by a user on an affected device, triggers the memory corruption in the OpenGL implementation. No additional authentication or privileges are required; the attack vector is remote via the web browser. The exact exploitation steps are not publicly detailed, but the issue is in the handling of OpenGL calls from web content.

Impact

Successful exploitation allows an attacker to execute arbitrary code on the target system with the privileges of the affected application (typically Safari or WebKit). Alternatively, the attacker could cause a denial of service through memory corruption, leading to application crash or system instability. The impact is high, as it can lead to full compromise of the device.

Mitigation

Apple addressed this vulnerability in iOS 9.1 and OS X El Capitan 10.11.1, as well as Security Update 2015-004 for Yosemite and Security Update 2015-007 for Mavericks. Users should update to the latest available versions. No workarounds are documented. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog as of the publication date. [1][2]