Apple iOS and iPadOS CVE-2019-8841 Arbitrary Code Execution Vulnerability

Description

Apple iOS and iPadOS are prone to an arbitrary code execution vulnerability. A remote attacker can leverage this issue to execute arbitrary code with kernel privileges on the affected system. Failed exploit attempts may result in a denial-of-service condition.

Technologies Affected

• Apple iOS 10
• Apple iOS 10.0.1
• Apple iOS 10.1
• Apple iOS 10.2
• Apple iOS 10.2.1
• Apple iOS 10.3
• Apple iOS 10.3.1
• Apple iOS 10.3.2
• Apple iOS 10.3.3
• Apple iOS 11
• Apple iOS 11.1
• Apple iOS 11.2
• Apple iOS 11.2.1
• Apple iOS 11.2.2
• Apple iOS 11.2.5
• Apple iOS 11.2.6
• Apple iOS 11.3
• Apple iOS 11.3.1
• Apple iOS 11.4
• Apple iOS 11.4.1
• Apple iOS 12
• Apple iOS 12.0.1
• Apple iOS 12.1
• Apple iOS 12.1.1
• Apple iOS 12.1.3
• Apple iOS 12.1.4
• Apple iOS 12.2
• Apple iOS 12.3
• Apple iOS 12.4
• Apple iOS 12.4.1
• Apple iOS 13
• Apple iOS 13.1
• Apple iOS 13.2
• Apple iOS 2.0
• Apple iOS 2.1
• Apple iOS 3
• Apple iOS 3.0
• Apple iOS 3.1
• Apple iOS 3.2
• Apple iOS 3.2.1
• Apple iOS 3.2.2
• Apple iOS 4
• Apple iOS 4
• Apple iOS 4.0.1
• Apple iOS 4.0.2
• Apple iOS 4.1
• Apple iOS 4.2
• Apple iOS 4.2 beta
• Apple iOS 4.2.1
• Apple iOS 4.2.10
• Apple iOS 4.2.5
• Apple iOS 4.2.6
• Apple iOS 4.2.7
• Apple iOS 4.2.8
• Apple iOS 4.2.9
• Apple iOS 4.3
• Apple iOS 4.3.1
• Apple iOS 4.3.2
• Apple iOS 4.3.3
• Apple iOS 4.3.4
• Apple iOS 4.3.5
• Apple iOS 5
• Apple iOS 5
• Apple iOS 5.0.1
• Apple iOS 5.1
• Apple iOS 5.1.1
• Apple iOS 6
• Apple iOS 6.0.1
• Apple iOS 6.0.2
• Apple iOS 6.1
• Apple iOS 6.1.3
• Apple iOS 6.1.4
• Apple iOS 6.1.6
• Apple iOS 6.3.1
• Apple iOS 7
• Apple iOS 7.0.1
• Apple iOS 7.0.2
• Apple iOS 7.0.3
• Apple iOS 7.0.4
• Apple iOS 7.0.5
• Apple iOS 7.0.6
• Apple iOS 7.1
• Apple iOS 7.1.1
• Apple iOS 7.1.2
• Apple iOS 7.2.0
• Apple iOS 8
• Apple iOS 8.1
• Apple iOS 8.1.1
• Apple iOS 8.1.2
• Apple iOS 8.1.3
• Apple iOS 8.2
• Apple iOS 8.3
• Apple iOS 8.4
• Apple iOS 8.4.1
• Apple iOS 9
• Apple iOS 9.0.1
• Apple iOS 9.0.2
• Apple iOS 9.1
• Apple iOS 9.2
• Apple iOS 9.2.1
• Apple iOS 9.3
• Apple iOS 9.3.1
• Apple iOS 9.3.2
• Apple iOS 9.3.3
• Apple iOS 9.3.4
• Apple iOS 9.3.5
• Apple iPadOS 13.1
• Apple iPadOS 13.2
• Apple iPadOS

Recommendations

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.

Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by 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.

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