CVE-2017-6974 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.12.4 is affected. The issue involves the system-installation subsystem of the "System Integrity Protection" component. It allows attackers to modify the contents of a protected disk location via a crafted app.
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Analysis
by VulDB Data Team • 11/02/2024
The vulnerability identified as CVE-2017-6974 represents a critical weakness in Apple's macOS operating system affecting versions prior to 10.12.4. This flaw resides within the system-installation subsystem of the System Integrity Protection (SIP) component, which serves as a fundamental security mechanism designed to protect core system files and directories from unauthorized modification. The vulnerability specifically targets protected disk locations that are typically shielded from modification by malicious actors or unauthorized applications. The issue manifests when attackers can exploit a crafted application to bypass the protective measures that SIP normally enforces, allowing them to modify critical system components that should remain immutable.
The technical exploitation of this vulnerability stems from a flaw in how the system-installation subsystem handles certain installation processes and permissions within the SIP framework. When a malicious application is crafted to take advantage of this weakness, it can manipulate the installation mechanisms to write or modify files in protected system directories. This represents a direct bypass of the security controls that SIP is designed to enforce, effectively undermining the integrity of the operating system's core protection mechanisms. The vulnerability essentially creates a pathway for privilege escalation through the installation process, allowing attackers to gain unauthorized write access to system-protected locations that should remain immutable to maintain system security and stability.
The operational impact of CVE-2017-6974 extends beyond simple file modification capabilities, as it fundamentally compromises the security posture of affected macOS systems. Attackers who successfully exploit this vulnerability can install malicious code in protected system areas, potentially enabling persistent backdoors, rootkits, or other advanced persistent threats that remain undetected by standard security mechanisms. This weakness particularly affects the integrity of the system's core components, as it allows for modifications to system files that could alter the behavior of critical security features or enable further exploitation of the system. The vulnerability's impact is amplified because it operates within the legitimate installation subsystem, making it harder to detect through conventional security monitoring approaches.
Organizations and users affected by this vulnerability should immediately implement mitigation strategies including updating to macOS 10.12.4 or later versions where Apple has patched this specific weakness. System administrators should conduct comprehensive vulnerability assessments to identify any potential exploitation attempts or unauthorized modifications that may have occurred before the patch was applied. The mitigation approach aligns with standard cybersecurity practices for addressing privilege escalation vulnerabilities, as outlined in the CWE (Common Weakness Enumeration) catalog which classifies this issue as a weakness related to improper privilege management. Additionally, this vulnerability demonstrates characteristics consistent with techniques documented in the MITRE ATT&CK framework under privilege escalation tactics, specifically targeting system integrity protection bypass methods that attackers commonly employ to establish persistent access to target systems.
The broader implications of this vulnerability highlight the critical importance of maintaining up-to-date system patches, particularly for core security components like System Integrity Protection. Apple's vulnerability disclosure and patching process demonstrates the industry standard approach to addressing such weaknesses, where timely updates are essential to protect against known exploitation techniques. Security professionals should monitor for similar vulnerabilities in system installation and integrity protection mechanisms, as these components represent high-value targets for attackers seeking to establish persistent access or compromise system security. The vulnerability also underscores the need for layered security approaches that go beyond traditional endpoint protection, including continuous monitoring of system integrity and implementation of robust patch management processes that can quickly address newly discovered weaknesses in operating system security frameworks.