Race Condition Affecting ruby-passenger package, versions <4.0.53-1+deb8u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN8-RUBYPASSENGER-275098
- published17 Jun 2018
- disclosed17 Jun 2018
Introduced: 17 Jun 2018
CVE-2018-12029 (opens in a new tab)How to fix?
Upgrade Debian:8 ruby-passenger to version 4.0.53-1+deb8u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby-passenger package and not the ruby-passenger package as distributed by Debian.
See How to fix? for Debian:8 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2018-12029
- https://lists.debian.org/debian-lts-announce/2018/06/msg00007.html
- https://security.gentoo.org/glsa/201807-02
- https://blog.phusion.nl/passenger-5-3-2
- https://pulsesecurity.co.nz/advisories/phusion-passenger-priv-esc
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-12029