CVE-2019-8530 in macOS
Summary
by MITRE
This issue was addressed with improved checks. This issue is fixed in iOS 12.2, macOS Mojave 10.14.4, tvOS 12.2. A malicious application may be able to overwrite arbitrary files.
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Analysis
by VulDB Data Team • 06/12/2024
This vulnerability represents a critical file system security flaw that existed in Apple's operating systems prior to the mentioned updates. The issue stems from insufficient validation mechanisms within the system's file handling processes, creating an environment where malicious applications could exploit weak access controls to overwrite arbitrary files on affected systems. The vulnerability specifically affects iOS 12.1 and earlier versions, macOS Mojave 10.14.3 and earlier, and tvOS 12.1 and earlier releases, indicating a widespread impact across Apple's ecosystem. From a cybersecurity perspective, this represents a privilege escalation vulnerability that could allow attackers to bypass normal file system protections and manipulate critical system files or user data.
The technical nature of this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. This flaw likely involved insufficient input validation in file system operations where the system failed to properly sanitize file paths or validate user permissions before executing file modification operations. Attackers could potentially craft malicious applications that exploit this weakness to write to locations outside of their intended scope, effectively allowing arbitrary file overwrite capabilities. The vulnerability's classification as a file system manipulation issue suggests it may have been related to how the operating system handles file descriptors, symbolic links, or directory traversal operations.
The operational impact of this vulnerability is significant as it provides attackers with the capability to overwrite any file on the system that the malicious application has access to or can otherwise reach through the exploit. This could result in system instability, data corruption, complete system compromise, or the installation of persistent malware. The vulnerability's nature as an arbitrary file overwrite means that attackers could potentially target critical system files, user documents, or even system executables to create backdoors or cause system-wide failures. The threat landscape for this vulnerability would have been particularly concerning given that it could be exploited through seemingly legitimate applications that could be distributed through official app stores or maliciously installed by users.
Mitigation strategies for this vulnerability centered around applying the security patches released by Apple in iOS 12.2, macOS Mojave 10.14.4, and tvOS 12.2. Organizations and users should have immediately upgraded to these versions to eliminate the risk. Additionally, security best practices such as maintaining updated software, implementing application whitelisting policies, and monitoring for suspicious file system activity would have provided additional layers of protection. The fix likely involved strengthening input validation mechanisms and implementing more robust access control checks within the file system APIs, ensuring that applications cannot perform file operations outside of their designated permissions. Security professionals should have monitored for any exploitation attempts during the vulnerability window and implemented network-based detection measures to identify potential malicious activity targeting this specific flaw.