What’s Vulnerable › Vulnerabilities

CVE-2018-12027

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-17 · updated 2026-06-17
• Weakness: CWE-200

Description

An Insecure Permissions vulnerability in SpawningKit in Phusion Passenger 5.3.x before 5.3.2 causes information disclosure in the following situation: given a Passenger-spawned application process that reports that it listens on a certain Unix domain socket, if any of the parent directories of said socket are writable by a normal user that is not the application's user, then that non-application user can swap that directory with something else, resulting in traffic being redirected to a non-application user's process through an alternative Unix domain socket.

Affected products

• Phusion Passenger: from 5.3.0 before 5.3.2 — fixed in 5.3.2

How to fix

Upgrade to a fixed version: Phusion Passenger 5.3.2. Check the vendor advisory for mitigations.

References

• https://blog.phusion.nl/passenger-5-3-2
• https://security.gentoo.org/glsa/201807-02
• https://blog.phusion.nl/passenger-5-3-2
• https://security.gentoo.org/glsa/201807-02

Get alerted when CVE-2018-12027 or the next vulnerability affects your stack