CVE-2018-12029: Debian Linux
High severity, CVSS 7.0. EPSS: 0.3% chance of exploitation in the next 30 days.
A race condition in the nginx module in Phusion Passenger 3.x through 5.x before 5.3.2 allows local escalation of privileges when a non-standard passenger_instance_registry_dir with insufficiently strict permissions is configured. Replacing a file with a symlink after the file was created, but before it was chowned, leads to the target of the link being chowned via the path. Targeting sensitive files such as root's crontab file allows privilege escalation.
Affected products
Published 2018-06-17. Last modified 2026-06-17.