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LOW severity

Authelia's Group Changes may not have the expected results (YAML file backend)GHSA-x883-2vmg-xwf7

LOW

GHSA-x883-2vmg-xwf7 is a low-severity (CVSS 1.6) vulnerability in github.com/authelia/authelia/v4. A fix is available for github.com/authelia/authelia/v4 — see the affected versions and patch details below.

Also known asGO-2024-2744
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Apr 26, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐹github.com/authelia/authelia/v4

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Under very specific conditions changes to a users groups may not have the expected results.

The specific conditions are:

  • The file authentication backend is being used.
  • The watch option is set to true.
  • The refresh_interval is configured to a non-disabled value.
  • The users groups are adjusted by an administrator.
  • The user attempts to access a resource that their groups previously had access to but their new groups do not have access to.

When these conditions are met administrators may find the changes are not taken into account by access control for longer than expected periods. While this may not necessarily be a security vulnerability it's security-adjacent and because of the unexpected nature of it and our dedication to a security-first culture we feel it's important to make users aware of this behaviour utilizing a security advisory and the existence of a fix.

This:

  • Can not have an Impact for Unauthenticated Users.
  • Can not have an Impact for Configurations utilizing the LDAP Backend.
  • Can not be directly or indirectly caused by a users or third parties actions.

Patches

This behaviour was identified after it was inadvertently fixed in the master branch during the multi-cookie domain rework (i.e. between feature releases). A patch for prior versions can be provided upon request. The fix was to ensure the details are updated regardless of backend, it was a small oversight in previous functionality which made refreshing ineffectual prior to v4.37.0.

Workarounds

Ensure you restart between user database changes.

References

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/authelia/authelia/v4≥ 4.37.0&&< 4.38.04.38.0go get github.com/authelia/authelia/v4@v4.38.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/authelia/authelia/v4, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/authelia/authelia/v4 to 4.38.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x883-2vmg-xwf7 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### Impact Under very specific conditions changes to a users groups may not have the expected results. The specific conditions are: * The file authentication backend is being used. * The [watch](https://www.authelia.com/configuration/first-factor/file/#watch) option is set to true. * The [refresh_interval](https://www.authelia.com/configuration/first-factor/introduction/#refresh_interval) is configured to a non-disabled value. * The users groups are adjusted by an administrator. * The user attempts to access a resource that their groups previously had access to but their new groups do not h
O3 Security · Impact-Aware SCA

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Authelia's Group Changes may not have the expected…