CVE-2018-4045 in CleanMyMac X
Summary
by MITRE
An exploitable privilege escalation vulnerability exists in the helper service of Clean My Mac X, version 4.04, due to improper input validation. An attacker with local access could exploit 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-2018-4045 represents a critical privilege escalation flaw within the Clean My Mac X software suite, specifically affecting version 4.04. This issue resides in the helper service component that operates with elevated privileges, creating a significant security risk for macOS systems. The vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing. The helper service, designed to perform system-level operations, accepts inputs without sufficient verification, allowing malicious actors to inject crafted payloads that bypass normal access controls. This flaw fundamentally undermines the security model of the application by enabling unauthorized modification of system resources through a local attacker's perspective.
The technical implementation of this vulnerability can be categorized under CWE-20, which describes improper input validation as a core weakness. Attackers exploiting this issue can leverage local access to manipulate the helper service's behavior, effectively elevating their privileges from standard user level to root access. The exploitation process typically involves crafting malicious input that gets processed by the vulnerable helper service, which then executes with root privileges due to its design requirements. This creates a dangerous attack surface where local users can modify critical system files, install malicious software, or alter security configurations without proper authentication. The vulnerability demonstrates a classic privilege escalation pattern where a service running with elevated permissions fails to validate inputs properly, allowing arbitrary code execution with root privileges.
The operational impact of CVE-2018-4045 extends beyond simple file system modification capabilities, as it fundamentally compromises the integrity and security posture of affected systems. Once exploited, attackers gain complete control over the system's file system, enabling them to modify system binaries, install rootkits, or manipulate security settings. This vulnerability aligns with ATT&CK technique T1068, which covers local privilege escalation through the exploitation of software vulnerabilities. The attack surface is particularly concerning because it requires minimal prerequisites - only local access to the system - making it accessible to users who might not otherwise have significant security privileges. The helper service component typically operates with broad system access rights to perform its intended functions, but this design choice becomes a security liability when combined with insufficient input validation mechanisms.
Mitigation strategies for this vulnerability should focus on both immediate remediation and long-term architectural improvements. The primary solution involves updating to a patched version of Clean My Mac X that addresses the input validation issues in the helper service. System administrators should also implement monitoring for suspicious helper service activity and consider restricting access to the helper service through additional security controls. The vulnerability highlights the importance of the principle of least privilege in software design, where helper services should operate with minimal necessary permissions rather than broad system access. Security professionals should also consider implementing additional layers of protection such as code integrity checks and system monitoring to detect potential exploitation attempts. Organizations should conduct regular security assessments of third-party applications to identify similar vulnerabilities in their software ecosystem, as this flaw demonstrates how seemingly legitimate applications can contain critical security weaknesses that compromise entire systems.