CVE-2022-22676 in macOS
Summary
by MITRE • 05/26/2022
An event handler validation issue in the XPC Services API was addressed by removing the service. This issue is fixed in macOS Monterey 12.2. An application may be able to delete files for which it does not have permission.
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Analysis
by VulDB Data Team • 06/01/2022
The vulnerability identified as CVE-2022-22676 represents a critical event handler validation flaw within the XPC Services API framework of macOS operating systems. This issue specifically affects the cross-platform communication mechanisms that enable applications to interact with system services through the XPC (Cross-Platform Communication) infrastructure. The vulnerability stems from insufficient validation of event handlers within the XPC Services API, creating a pathway for unauthorized file operations that bypass normal permission controls. The flaw was particularly concerning as it allowed applications to perform file deletion operations without possessing the necessary authorization rights, effectively undermining the operating system's permission model and file security controls.
The technical nature of this vulnerability aligns with CWE-264, which addresses permissions, privileges, and access controls within software systems. The XPC Services API operates as a fundamental component of macOS system architecture, facilitating inter-process communication between applications and system services. When event handlers within this API fail to properly validate incoming requests, malicious or flawed applications can exploit this weakness to execute unauthorized operations. The vulnerability specifically manifests when applications attempt to delete files through the XPC service interface, bypassing the standard permission checking mechanisms that normally prevent such actions. This represents a significant deviation from expected security behavior where the operating system's access control policies should prevent unauthorized file manipulation regardless of the communication channel used.
The operational impact of CVE-2022-22676 extends beyond simple file deletion capabilities, as it fundamentally compromises the integrity of the macOS security model. An attacker could potentially exploit this vulnerability to remove critical system files, user data, or application components without proper authorization, leading to system instability, data loss, or complete system compromise. The vulnerability affects macOS Monterey 12.2 and earlier versions, making it particularly dangerous for organizations that have not yet updated their systems. From an adversary perspective, this flaw maps to ATT&CK technique T1059.003, which covers execution through script interpreters, as applications could leverage this vulnerability to execute unauthorized file operations through the XPC service layer. The attack surface is further expanded by the fact that XPC services are commonly used by legitimate applications, making the vulnerability more difficult to detect and prevent.
The remediation for this vulnerability involves the complete removal of the affected XPC Services API component, as implemented in macOS Monterey 12.2. This approach represents a defensive measure that eliminates the attack vector entirely rather than attempting to patch the validation logic. Organizations should prioritize updating to macOS Monterey 12.2 or later versions to address this vulnerability, as the removal of the service component prevents exploitation while maintaining system functionality through alternative mechanisms. Security teams should conduct comprehensive vulnerability assessments to identify any applications that might rely on the removed XPC services, ensuring proper application compatibility and functionality. Additionally, system administrators should monitor for any unauthorized file deletion activities that might indicate exploitation attempts, as this vulnerability could potentially be combined with other attack vectors to achieve more significant compromise objectives. The resolution demonstrates Apple's approach to addressing critical security flaws through complete service removal when the vulnerability cannot be effectively patched without significant risk to system stability.