CVE-2019-8589

Vulnerability

CVE-2019-8589 is a vulnerability in macOS Gatekeeper, the security mechanism that verifies applications before allowing them to run. The issue exists in macOS Mojave 10.14.4 and earlier, where a malicious application can bypass Gatekeeper checks. The flaw was addressed with improved validation in macOS Mojave 10.14.5 [1].

Exploitation

An attacker would need to deliver a malicious application to the target system, either by tricking the user into downloading and opening it or through other means of installation. The application would be crafted to evade Gatekeeper's signature and notarization checks. The exact exploitation steps are not publicly detailed, but the bypass allows the application to run without the usual security warnings.

Impact

Successful exploitation allows a malicious application to execute arbitrary code on the affected system without triggering Gatekeeper's security prompts. This could lead to full compromise of the user's data and system, including unauthorized access to files, installation of malware, or further privilege escalation.

Mitigation

The vulnerability is fixed in macOS Mojave 10.14.5, released on May 13, 2019 [1]. Users should update to this version or later. No workarounds are documented; updating is the only recommended mitigation.