CVE-2022-42841 in macOS
Summary
by MITRE • 12/15/2022
A type confusion issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.6.2, macOS Ventura 13.1, macOS Big Sur 11.7.2. Processing a maliciously crafted package may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 04/22/2025
The vulnerability identified as CVE-2022-42841 represents a type confusion flaw that exists within Apple's operating system implementations, specifically affecting macOS versions prior to the mentioned security updates. This issue falls under the category of memory safety vulnerabilities and demonstrates a fundamental weakness in how the system handles type validation during package processing operations. Type confusion vulnerabilities occur when a program incorrectly handles data types, leading to situations where one data type is treated as another, potentially allowing attackers to manipulate memory layout and execution flow. The flaw is particularly concerning as it exists within the core system processing mechanisms that handle package installations and updates.
The technical implementation of this vulnerability stems from insufficient type validation checks within the package processing subsystem of macOS. When the system encounters a maliciously crafted package, the improper type handling allows an attacker to manipulate the memory structures in ways that were not anticipated by the original design. This type confusion can be exploited to overwrite critical memory locations, potentially leading to arbitrary code execution within the privileges of the running process. The vulnerability specifically manifests during package installation or processing activities, where the system's type checking mechanisms fail to properly validate the expected data types, creating opportunities for attackers to craft malicious inputs that trigger the type confusion state.
The operational impact of CVE-2022-42841 extends beyond simple privilege escalation scenarios, as the arbitrary code execution capability provides attackers with extensive control over affected systems. This vulnerability can be leveraged to install malicious software, modify system configurations, access sensitive data, or establish persistent backdoors within the compromised environment. The attack surface is particularly broad given that package processing is a fundamental system function that occurs during normal software installation and update procedures. Security researchers have noted that this vulnerability aligns with CWE-466, which specifically addresses the issue of "Use of sizeof() on a Pointer Type," and potentially with CWE-129, "Improper Validation of Array Index," as the type confusion often manifests through improper memory access patterns. The exploitability of this vulnerability is enhanced by the fact that it can be triggered through legitimate package installation processes, making it difficult to distinguish between malicious and benign activities.
Organizations and individuals should immediately apply the security updates released by Apple to address this vulnerability, as the patches include enhanced type validation checks that prevent the conditions leading to type confusion. The recommended mitigation strategy involves deploying the latest macOS updates, specifically version 12.6.2 for Monterey, 13.1 for Ventura, and 11.7.2 for Big Sur. Additionally, system administrators should implement monitoring for unusual package installation activities and consider restricting package installation privileges to reduce the potential attack surface. The vulnerability's alignment with ATT&CK technique T1505.003, "Exploit Public-Facing Application," indicates that organizations should also review their network perimeter defenses and application security controls to prevent exploitation attempts. Organizations should also consider implementing sandboxing mechanisms and privilege separation techniques to limit the potential impact should the vulnerability be successfully exploited in the wild, as the arbitrary code execution capability provides attackers with extensive system control and access privileges.