CVE-2018-4175 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.13.4 is affected. The issue involves the "LaunchServices" component. It allows attackers to bypass the code-signing protection mechanism via a crafted app.
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Analysis
by VulDB Data Team • 07/27/2024
The vulnerability identified as CVE-2018-4175 represents a critical security flaw within Apple's macOS operating system affecting versions prior to 10.13.4. This vulnerability specifically targets the LaunchServices component which serves as a fundamental system service responsible for managing application launches and maintaining application associations within the macOS environment. The flaw enables malicious actors to circumvent the code-signing protection mechanisms that are essential for ensuring application integrity and preventing unauthorized software execution. The LaunchServices framework plays a crucial role in the macOS architecture by maintaining database records of installed applications and their associated handlers, making it a prime target for attackers seeking to exploit system-level trust mechanisms.
The technical exploitation of this vulnerability occurs through the manipulation of crafted applications that can trick the LaunchServices component into accepting unsigned or improperly signed applications. This bypass mechanism operates at a fundamental level within the operating system's security architecture, allowing attackers to execute malicious code without the normal code-signing verification processes that would typically prevent such execution. The vulnerability essentially undermines the code-signing protection model that Apple implements to ensure that only trusted applications can run on the system. This flaw falls under the category of privilege escalation and code execution vulnerabilities, specifically relating to the improper validation of application signatures within the system's launch services framework. The issue demonstrates a failure in the system's integrity checking mechanisms and represents a significant weakening of the security model that macOS employs to protect users from malicious software.
The operational impact of CVE-2018-4175 extends beyond simple code execution capabilities as it fundamentally compromises the trust model that macOS relies upon for system security. Attackers can leverage this vulnerability to install and execute malicious applications that would normally be blocked by the code-signing protection mechanisms, potentially leading to full system compromise. The vulnerability affects the core functionality of the operating system's application management system, which means that any application that depends on LaunchServices for proper execution could be subject to this attack vector. This weakness creates opportunities for attackers to deploy malware, backdoors, or other malicious payloads that can persist on the system and potentially escalate privileges. The implications of this vulnerability are particularly severe because it operates at a system level rather than requiring user interaction for exploitation, making it a high-value target for both automated attacks and sophisticated threat actors.
Mitigation strategies for this vulnerability require immediate system updates to macOS 10.13.4 or later versions where Apple has implemented patches to address the LaunchServices code-signing bypass mechanism. Organizations should prioritize patch management procedures to ensure all affected systems receive the necessary updates promptly. System administrators should also implement additional monitoring of application launches and signature validation processes to detect potential exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security patches and highlights the need for continuous security assessment of system components. From a cybersecurity perspective, this vulnerability aligns with attack patterns described in the MITRE ATT&CK framework under the T1195 technique for "Supply Chain Compromise" and T1059 for "Command and Scripting Interpreter," as attackers can use this vulnerability to establish persistent access through legitimate system components. Security professionals should also consider implementing application whitelisting policies and enhanced monitoring of LaunchServices activities to detect anomalous behavior that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining robust code-signing validation processes and the potential consequences when these mechanisms fail.