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CVE-2018-12029

Published: 17 June 2018

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.

Priority

Medium

Cvss 3 Severity Score

7.0

Score breakdown

Status

Package Release Status
passenger
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (5.0.30-1+deb9u1build0.18.04.1)
cosmic
Released (5.0.30-1+deb9u1build0.18.10.1)
disco
Released (5.0.30-1+deb9u1build0.19.04.1)
eoan Not vulnerable
(5.0.30-1.1)
focal Not vulnerable
(5.0.30-1.1)
groovy Not vulnerable
(5.0.30-1.1)
hirsute Not vulnerable
(5.0.30-1.1)
impish Not vulnerable
(5.0.30-1.1)
jammy Not vulnerable
(5.0.30-1.1)
trusty Does not exist

upstream
Released (5.0.30-1.1)
xenial
Released (5.0.27-2ubuntu0.1~esm1)
Available with Ubuntu Pro
Patches:
upstream: https://github.com/phusion/passenger/commit/207870f5b7f5cc240587ab0977d6046782ae1d86
ruby-passenger
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist
(trusty was needs-triage)
upstream Needs triage

xenial Does not exist

Severity score breakdown

Parameter Value
Base score 7.0
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H