Описание
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.
Пакеты
| Пакет | Статус | Версия исправления | Релиз | Тип |
|---|---|---|---|---|
| passenger | fixed | 5.0.30-1.1 | package | |
| passenger | fixed | 5.0.30-1+deb9u1 | stretch | package |
| ruby-passenger | removed | package |
Примечания
https://blog.phusion.nl/2018/06/12/passenger-5-3-2-various-security-fixes/
https://github.com/phusion/passenger/commit/207870f5b7f5cc240587ab0977d6046782ae1d86 (release-5.3.2)
unimportant as nginx module not built.
Related hardening commits:
https://github.com/phusion/passenger/commit/9ed61bb4641ba1f5158fca3840d4e4088805b5af (release-5.3.2)
https://github.com/phusion/passenger/commit/4f663c8246f529e32575d50196d11cde12a6dfda (release-5.3.3)
https://pulsesecurity.co.nz/advisories/phusion-passenger-priv-esc
Связанные уязвимости
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.
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.
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.
Phusion Passenger Race Condition Allows Privilege Escalation