CVE-2019-6236 in iCloud
Summary
by MITRE
A race condition existed during the installation of iCloud for Windows. This was addressed with improved state handling. This issue is fixed in iCloud for Windows 7.11. Running the iCloud installer in an untrusted directory may result in arbitrary code execution.
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Analysis
by VulDB Data Team • 06/13/2024
The vulnerability identified as CVE-2019-6236 represents a significant security flaw in Apple's iCloud for Windows installation process that stems from inadequate race condition handling during software deployment. This type of vulnerability falls under the broader category of improper handling of concurrent operations and can be classified as CWE-362, which specifically addresses race conditions in software implementations. The flaw manifests when the iCloud installer executes in an untrusted directory environment, creating opportunities for malicious actors to manipulate the installation process and potentially execute arbitrary code on target systems.
The technical nature of this vulnerability exploits the timing gap between when the installer checks for the existence of certain files or directories and when it actually performs operations on them. During this window, an attacker can place malicious files in the installation directory, causing the installer to execute unintended code with the privileges of the user running the installation. This race condition occurs because the installer does not properly validate the state of the installation environment before proceeding with file operations, allowing for directory traversal attacks and privilege escalation scenarios. The vulnerability specifically affects systems where the installer runs in directories that are not properly secured or monitored.
The operational impact of CVE-2019-6236 extends beyond simple code execution, as it provides attackers with a potential pathway for privilege escalation and persistent access to compromised systems. When an attacker successfully exploits this vulnerability, they can gain arbitrary code execution capabilities that may allow them to install additional malware, modify system configurations, or establish backdoors within the Windows environment. This issue is particularly concerning because it affects a widely deployed software component that many users trust and run with elevated privileges. The vulnerability's exploitation requires minimal user interaction beyond running the installer, making it particularly dangerous in environments where users may not be security-aware or where automated deployment scenarios exist.
Security mitigations for CVE-2019-6236 primarily focus on ensuring proper state handling and file validation during installation processes. Organizations should implement strict directory permissions and access controls to prevent untrusted users from modifying installation directories. The fix included in iCloud for Windows 7.11 addresses the race condition by implementing improved state handling mechanisms that validate file integrity and directory contents before proceeding with installation operations. Security best practices recommend running installation processes in secure, isolated environments and avoiding execution from untrusted directories. This vulnerability also aligns with ATT&CK technique T1059.001, which covers command and script interpreter execution, as the arbitrary code execution capability can be leveraged to run malicious scripts or commands on compromised systems. System administrators should monitor for suspicious installation activities and ensure that all software installations are performed from trusted sources and directories to prevent exploitation of similar race condition vulnerabilities.