FortiGuard Labs Threat Analysis Report on an Memory Corruption Vulnerability in QuartzCore while Handling Shape Object.
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On March 25, 2019, Apple released macOS Mojave 10.14.4 and iOS 12.2. These two updates fixed a number of security vulnerabilities, including CVE-2019-8507 in QuartzCore (aka CoreAnimation), which I reported to Apple on January 3, 2019 using our FortiGuard Labs responsible disclosure process, read more. For more details on the Apple updates, please refer to https://support.apple.com/en-us/HT209600. In this blog I will provide a detailed analysis of this issue on macOS. Some of the analysis techniques used can be found in my previous blog, “Detailed Analysis of macOS/iOS Vulnerability CVE-2019-6231”.
0x01 A Quick Look
QuartzCore, also known as CoreAnimation, is a framework used by macOS and iOS to create animatable scene graphics. CoreAnimation uses a unique rendering model where the graphics operations are run in a separate process. On macOS, the process is WindowServer. On iOS, the process is backboard.
The service named com.apple.CARenderServer in QuartzCore is usually referenced as CARenderServer. This service exists in both macOS and iOS, and can be accessed from the Safari Sandbox. A memory corruption vulnerability exists when QuartzCore handles a shape object in the function CA::Render::Decoder::decode_shape() on macOS. This may lead to unexpected application termination.
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The following is the crash log of the WindowServer process when this issue is triggered.