CVE-2024-54520 is a vulnerability in Apple macOS involving a path handling issue that allows an application to overwrite arbitrary files on the system. The root cause is insufficient validation of file paths, which can be exploited by a local app to write to files it should not have permission to modify. This vulnerability affects multiple recent macOS versions, specifically Sequoia 15.2, Sonoma 14.7.2, and Ventura 13.7.2, and has been addressed by Apple through improved path validation mechanisms. The vulnerability is classified under CWE-787 (Out-of-bounds Write), indicating that the flaw involves writing data outside the intended buffer or file boundaries. The CVSS 3.1 base score is 5.5, with an attack vector of local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope is unchanged (S:U), confidentiality impact is none (C:N), integrity impact is high (I:H), and availability impact is none (A:N). This means an attacker with local access and the ability to convince a user to interact with a malicious app could overwrite arbitrary files, potentially leading to integrity violations such as privilege escalation or system instability. There are no known exploits in the wild at this time, but the vulnerability poses a risk especially in environments where local app installation is less controlled. The patch is included in the specified macOS updates, and users are advised to upgrade to these versions to remediate the issue.

The primary impact of CVE-2024-54520 is on the integrity of affected macOS systems. By allowing an app to overwrite arbitrary files, attackers can modify system or user files, potentially injecting malicious code, altering configurations, or corrupting critical data. This could lead to privilege escalation if system files or executables are overwritten, enabling further compromise of the system. Although the vulnerability does not directly impact confidentiality or availability, the integrity breach can facilitate more severe attacks. Organizations relying on macOS for critical operations, development, or sensitive data processing may face increased risk of targeted attacks exploiting this flaw. Since exploitation requires local access and user interaction, the threat is more significant in environments with lax endpoint controls or where users may install untrusted applications. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks. Overall, the vulnerability could undermine trust in affected systems and lead to operational disruptions or data integrity issues if exploited.

To mitigate CVE-2024-54520, organizations should prioritize applying the security updates released by Apple for macOS Sequoia 15.2, Sonoma 14.7.2, and Ventura 13.7.2, which contain the fix for this vulnerability. Beyond patching, organizations should enforce strict application installation policies, limiting local app installations to trusted sources only, and use macOS security features such as Gatekeeper and System Integrity Protection (SIP) to reduce the risk of malicious apps executing. Endpoint detection and response (EDR) solutions should be configured to monitor for unusual file modification activities, especially in system directories or sensitive user files. User education is important to reduce the likelihood of interaction with untrusted applications that could exploit this flaw. Additionally, implementing least privilege principles for user accounts can limit the potential damage from local exploits. Regular audits of installed applications and file integrity monitoring can help detect attempts to exploit this vulnerability. Organizations should also maintain robust backup and recovery procedures to restore integrity in case of compromise.