CVE-2019-8618 in iOS
Summary
by MITRE • 10/28/2020
A logic issue was addressed with improved restrictions. This issue is fixed in watchOS 5.2, macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra, iOS 12.2. A sandboxed process may be able to circumvent sandbox restrictions.
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Analysis
by VulDB Data Team • 11/28/2020
The vulnerability identified as CVE-2019-8618 represents a critical sandbox escape flaw that undermines the fundamental security boundaries designed to isolate applications and processes on Apple's ecosystem. This logic issue affects multiple operating systems including watchOS 5.2, macOS Mojave 10.14.4, and various iOS versions, demonstrating the widespread nature of the sandbox restriction bypass. The vulnerability resides in the core security architecture that governs how sandboxed processes interact with system resources, creating a pathway for malicious actors to elevate privileges and access restricted areas of the operating system. The flaw specifically enables sandboxed applications to circumvent the containment mechanisms that are supposed to prevent them from accessing unauthorized system components, file systems, or network resources.
The technical nature of this vulnerability falls under CWE-250, which deals with execution of code with elevated privileges, and aligns with ATT&CK technique T1484.001 related to privilege escalation through sandbox escape mechanisms. The root cause involves improper validation of process permissions and insufficient enforcement of sandbox boundaries that should prevent applications from accessing system resources beyond their designated scope. When exploited, this vulnerability allows a malicious application running in a sandboxed environment to gain access to system-level resources that should remain restricted, effectively breaking down the isolation layer that separates user applications from critical system functions. The flaw manifests when legitimate sandboxed processes attempt to access system resources that are normally restricted, but due to the logic error, they can bypass these restrictions and execute unauthorized operations.
The operational impact of CVE-2019-8618 is severe as it provides attackers with a pathway to compromise the security model of Apple's operating systems. Attackers could potentially leverage this vulnerability to access sensitive user data, modify system files, or establish persistent access to affected devices. The implications extend beyond individual user privacy concerns to potential corporate security breaches, as the vulnerability affects devices that may be used in enterprise environments where strict security controls are expected. The fact that this issue affects multiple platforms including mobile devices, desktop operating systems, and wearable technology creates a broad attack surface that increases the likelihood of successful exploitation. Organizations relying on Apple devices for security-sensitive operations would face significant risks if this vulnerability remains unpatched.
Mitigation strategies for CVE-2019-8618 focus primarily on applying the official security updates released by Apple, which include watchOS 5.2, macOS Mojave 10.14.4, and the respective security updates for High Sierra and Sierra operating systems. System administrators should prioritize immediate deployment of these patches across all affected devices within their environments. Additional defensive measures include implementing strict application whitelisting policies, monitoring for suspicious process behavior, and maintaining comprehensive security awareness training for users to recognize potential exploitation attempts. Organizations should also consider network-based detection mechanisms that can identify unusual access patterns or attempts to escalate privileges. The vulnerability highlights the critical importance of maintaining up-to-date security patches and demonstrates how sandbox escape vulnerabilities can severely compromise the security posture of operating systems, making regular vulnerability assessments and prompt patch management essential components of any cybersecurity strategy.