Apple tvOS and macOS CVE-2019-8706 Memory Corruption Vulnerability

Description

Apple tvOS and macOS are prone to a memory-corruption vulnerability. Attackers can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts may result in a denial-of-service condition.

Technologies Affected

• Apple TV
• Apple macOS 10.12
• Apple macOS 10.12.1
• Apple macOS 10.12.2
• Apple macOS 10.12.3
• Apple macOS 10.12.4
• Apple macOS 10.12.5
• Apple macOS 10.12.6
• Apple macOS 10.13
• Apple macOS 10.13.1
• Apple macOS 10.13.2
• Apple macOS 10.13.3
• Apple macOS 10.13.4
• Apple macOS 10.13.5
• Apple macOS 10.13.6
• Apple macOS 10.14
• Apple macOS 10.14.1
• Apple macOS 10.14.2
• Apple macOS 10.14.3
• Apple macOS 10.14.4
• Apple macOS 10.14.5
• Apple macOS 10.14.6
• Apple macOS 10.15
• Apple tvOS 10
• Apple tvOS 10.0.1
• Apple tvOS 10.1
• Apple tvOS 10.1.1
• Apple tvOS 10.2
• Apple tvOS 10.2.1
• Apple tvOS 10.2.2
• Apple tvOS 11
• Apple tvOS 11.1
• Apple tvOS 11.2
• Apple tvOS 11.2.1
• Apple tvOS 11.2.5
• Apple tvOS 11.2.6
• Apple tvOS 11.4
• Apple tvOS 11.4.1
• Apple tvOS 12
• Apple tvOS 12.1.1
• Apple tvOS 12.1.2
• Apple tvOS 12.2.1
• Apple tvOS 12.3
• Apple tvOS 12.4
• Apple tvOS 12.4.1
• Apple tvOS 9.0
• Apple tvOS 9.1
• Apple tvOS 9.1.1
• Apple tvOS 9.2
• Apple tvOS 9.2.1
• Apple tvOS 9.2.2

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, run all applications with the minimal amount of privileges required for functionality.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not accept or execute files from untrusted or unknown sources.
To reduce the likelihood of successful exploits, never handle files that originate from unfamiliar or untrusted sources.

Implement multiple redundant layers of security.
Since some of these issues may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.

Evaluate read, write, and execute permissions on all newly installed software.
To limit exposure to these and other latent vulnerabilities, evaluate setgid and setuid settings on all installed applications.

Updates are available. Please see the references or vendor advisory for more information.