CVE-2018-4083 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.13.3 is affected. The issue involves the "Touch Bar Support" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 12/25/2024
The vulnerability identified as CVE-2018-4083 represents a critical security flaw within Apple's Touch Bar Support component affecting macOS versions prior to 10.13.3. This issue resides within the kernel-level subsystem responsible for managing the Touch Bar functionality on compatible Mac devices, making it particularly dangerous as it operates with elevated privileges. The vulnerability stems from improper input validation and memory management within the Touch Bar driver, creating a pathway for malicious code execution that bypasses standard security boundaries. Security researchers identified that the flaw manifests when the system processes specially crafted applications designed to exploit the underlying memory corruption issue.
The technical exploitation of this vulnerability occurs through a carefully constructed malicious application that leverages buffer overflow conditions within the Touch Bar Support framework. When such an application is executed, it triggers memory corruption that allows attackers to gain unauthorized access to privileged system resources. This memory corruption vulnerability aligns with CWE-121, which describes "Stack-based Buffer Overflow" conditions, and potentially CWE-122, "Heap-based Buffer Overflow," depending on the specific memory layout exploited. The flaw enables attackers to execute arbitrary code with system-level privileges, effectively compromising the entire operating system's integrity and potentially providing a foothold for further exploitation within the network environment.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments where Mac systems are prevalent, particularly in sectors requiring high security standards such as financial services, government agencies, and healthcare organizations. The ability to execute code in a privileged context means that an attacker could potentially escalate their access to gain full control over affected systems, install persistent backdoors, or exfiltrate sensitive data. The denial of service component of this vulnerability further compounds the risk as it could be used to disrupt critical business operations through system crashes or unresponsiveness. Organizations running affected macOS versions face potential exposure to sophisticated attack campaigns targeting their Mac infrastructure, especially in environments where users might unknowingly execute malicious applications.
Mitigation strategies for CVE-2018-4083 primarily focus on immediate system updates to macOS 10.13.3 or later versions where Apple has implemented proper input validation and memory management fixes. Security administrators should prioritize patching all affected systems and implement network monitoring to detect potential exploitation attempts. Additional protective measures include enabling Gatekeeper and System Integrity Protection features, which provide additional layers of defense against unauthorized code execution. The vulnerability demonstrates the importance of maintaining up-to-date security patches and highlights the risks associated with legacy software components. Organizations should also consider implementing application whitelisting policies to prevent execution of untrusted applications, aligning with ATT&CK technique T1195 for Supply Chain Compromise and T1059 for Command and Scripting Interpreter, which are commonly used in exploitation chains targeting such vulnerabilities. Regular security assessments and vulnerability scanning should be conducted to identify systems running unsupported macOS versions that may be susceptible to similar attacks.