CVE-2018-4041 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-2018-4041 represents a critical privilege escalation flaw within the Clean My Mac X software ecosystem, specifically targeting version 4.04. This issue resides in the helper service component that operates with elevated privileges, creating a dangerous attack surface for local adversaries. The vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing. When the helper service receives input from the main application, it does not adequately verify or sanitize the data, allowing malicious payloads to be executed with root privileges. This design flaw directly violates security principles of least privilege and input sanitization, creating an environment where unauthorized modifications can occur at the system level.
The technical implementation of this vulnerability demonstrates a classic path traversal and privilege escalation attack vector. The helper service operates with root permissions to perform system cleanup operations, but fails to validate the paths or parameters passed to it by the main application. An attacker with local access can manipulate the input parameters to the helper service, potentially causing it to execute commands or modify files outside of its intended scope. This weakness aligns with CWE-20, which addresses improper input validation, and CWE-78, which covers improper neutralization of special elements used in OS commands. The vulnerability allows for arbitrary code execution with root privileges, enabling attackers to modify system files, install malicious software, or establish persistent access to the compromised system.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the integrity of the macOS system. Local attackers can leverage this flaw to gain root access without requiring additional authentication or exploitation techniques. The attack surface is particularly concerning because the helper service typically runs with elevated privileges to perform legitimate system maintenance tasks, making it an attractive target for exploitation. Once exploited, the attacker can modify critical system files, replace binaries with malicious versions, or manipulate system configurations. This vulnerability directly relates to ATT&CK technique T1068, which covers local privilege escalation, and T1548.001, covering abuse of sudo privileges. The impact is significant as it allows for complete system compromise without requiring network access or complex attack chains.
Mitigation strategies for CVE-2018-4041 focus on both immediate remediation and long-term architectural improvements. The most effective immediate solution involves updating to a patched version of Clean My Mac X that properly validates all inputs to the helper service. System administrators should also implement monitoring of helper service processes and their executed commands to detect anomalous behavior. The vulnerability highlights the importance of secure coding practices, particularly around privilege management and input validation. Organizations should consider implementing additional security controls such as code signing verification, process monitoring, and privilege separation to prevent similar issues. The fix typically involves implementing proper input sanitization, validating all parameters before processing, and ensuring that helper services operate with the minimum required privileges. Additionally, regular security audits of third-party applications and their helper services can help identify similar vulnerabilities before they can be exploited by malicious actors.