CVE-2018-4034 in CleanMyMac X
Summary
by MITRE
The CleanMyMac X software contains an exploitable privilege escalation vulnerability that exists due to improper input validation. An attacker with local access could use this vulnerability to modify the file system as root.
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Analysis
by VulDB Data Team • 06/26/2023
The vulnerability identified as CVE-2018-4034 resides within the CleanMyMac X software ecosystem, representing a critical privilege escalation flaw that fundamentally compromises system security. This issue manifests through inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing. The vulnerability specifically affects macOS environments where CleanMyMac X operates with elevated privileges, creating a dangerous attack surface for local adversaries who can exploit this weakness to gain root-level access to the underlying operating system.
The technical implementation of this flaw stems from the software's failure to adequately validate inputs passed to system-level functions during its operation. When CleanMyMac X executes administrative tasks, it processes user inputs without sufficient sanitization checks, allowing malicious data to bypass normal security boundaries. This improper input validation creates a pathway where an attacker can inject crafted payloads or manipulate system calls to elevate their privileges from standard user level to root access. The vulnerability operates at the kernel level or through system service interactions, leveraging the legitimate administrative capabilities of the software to execute unauthorized modifications.
The operational impact of CVE-2018-4034 extends far beyond simple privilege escalation, as it provides attackers with complete control over the affected system. Once exploited, adversaries can modify any file system components, install malicious software, establish persistent backdoors, and access sensitive user data without detection. This vulnerability essentially transforms a legitimate system utility into a weapon for full system compromise, making it particularly dangerous in enterprise environments where such software is commonly deployed. The attack vector requires only local access, meaning that any user with physical or remote access to the system can potentially exploit this vulnerability, significantly expanding the attack surface.
Security professionals should recognize this vulnerability as aligning with CWE-20, which specifically addresses "Improper Input Validation" as a fundamental weakness in software design. The vulnerability also maps to several ATT&CK techniques including privilege escalation through malicious file execution and persistence mechanisms. Organizations should immediately implement mitigation strategies including disabling or removing vulnerable versions of CleanMyMac X, implementing application whitelisting policies, and conducting thorough system audits to detect potential exploitation. Additionally, regular security updates and patch management procedures should be enforced to prevent similar vulnerabilities from being introduced through third-party applications. The incident underscores the critical importance of validating all inputs and maintaining strict privilege boundaries even within seemingly legitimate administrative software components.