CVE-2018-12029 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://blog.phusion.nl/passenger-5-3-2 https://lists.debian.org/debian-lts-announce/2018/06/msg00007.html https://pulsesecurity.co.nz/advisories/phusion-passenger-priv-esc https://security.gentoo.org/glsa/201807-02

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.0