CVE-2022-26727 in macOS
Summary
by MITRE • 05/26/2022
This issue was addressed with improved entitlements. This issue is fixed in Security Update 2022-004 Catalina, macOS Monterey 12.4. A malicious application may be able to modify protected parts of the file system.
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Analysis
by VulDB Data Team • 05/28/2022
The vulnerability identified as CVE-2022-26727 represents a critical entitlements flaw in Apple's macOS operating system that allows malicious applications to bypass system protections and modify protected filesystem components. This issue stems from insufficient access control mechanisms that fail to properly validate application privileges when attempting to interact with system-protected directories and files. The vulnerability specifically affects macOS versions prior to Security Update 2022-004 Catalina and macOS Monterey 12.4, where the entitlement validation system was not properly enforcing restrictions on filesystem modifications. The flaw creates a pathway for unauthorized applications to gain elevated privileges through improper entitlement handling, potentially enabling persistent system compromise and data manipulation.
The technical implementation of this vulnerability involves the improper validation of application entitlements within the macOS security framework, which is categorized under CWE-284 Access Control Checks. The flaw occurs when applications with insufficient privileges attempt to access protected filesystem areas without proper authorization checks, allowing them to circumvent the system's mandatory access controls. This represents a privilege escalation vulnerability that operates at the kernel level, where malicious software can exploit the entitlement system to modify critical system files, directories, or resources that should normally be protected from unauthorized modification. The vulnerability's impact is particularly severe because it undermines fundamental security boundaries that separate user applications from system-critical components.
From an operational perspective, this vulnerability presents significant risk to macOS environments as it enables malicious actors to modify protected filesystem areas that contain system integrity verification mechanisms, configuration files, and security-related components. Attackers could leverage this flaw to install persistent backdoors, modify system binaries, or corrupt critical system data that would otherwise require administrator privileges to alter. The vulnerability's exploitation aligns with techniques described in the ATT&CK framework under T1068 Privilege Escalation and T1566 Phishing, as it enables attackers to gain elevated privileges through application-based attacks. The impact extends beyond individual system compromise to potentially affect enterprise environments where macOS systems serve as endpoints for sensitive data and critical operations.
Mitigation strategies for CVE-2022-26727 require immediate deployment of Security Update 2022-004 Catalina and macOS Monterey 12.4, which addresses the entitlement validation flaw through enhanced access control mechanisms. Organizations should implement comprehensive endpoint protection solutions that monitor for unauthorized filesystem modifications and provide real-time threat detection capabilities. System administrators should conduct thorough vulnerability assessments to identify potentially compromised systems and implement strict application control policies that limit the execution of unsigned or untrusted applications. The remediation process should include verification of system integrity through tools such as System Integrity Protection status checks and monitoring of system logs for suspicious entitlement usage patterns. Additionally, organizations should consider implementing network-based monitoring solutions to detect potential exploitation attempts and maintain updated threat intelligence feeds to identify emerging attack patterns targeting similar entitlement-based vulnerabilities.