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Flux CLI Workload Injection

High severity GitHub Reviewed Published Aug 31, 2022 in fluxcd/flux2 • Updated Jan 30, 2023

Package

gomod github.com/fluxcd/flux2 (Go)

Affected versions

>= 0.21.0, < 0.32.0

Patched versions

0.32.0

Description

Flux CLI allows users to deploy Flux components into a Kubernetes cluster via command-line. The vulnerability allows other applications to replace the Flux deployment information with arbitrary content which is deployed into the target Kubernetes cluster instead.

The vulnerability is due to the improper handling of user-supplied input, which results in a path traversal that can be controlled by the attacker.

Impact

Users sharing the same shell between other applications and the Flux CLI commands could be affected by this vulnerability.

In some scenarios no errors may be presented, which may cause end users not to realise that something is amiss.

Workarounds

A safe workaround is to execute Flux CLI in ephemeral and isolated shell environments, which can ensure no persistent values exist from previous processes. However, upgrading to the latest version of the CLI is still the recommended mitigation strategy.

Credits

The Flux engineering team found and patched this vulnerability.

For more information

If you have any questions or comments about this advisory:

  • Open an issue in any of the affected repositories.
  • Contact us at the CNCF Flux Channel.

References

@hiddeco hiddeco published to fluxcd/flux2 Aug 31, 2022
Published by the National Vulnerability Database Aug 31, 2022
Published to the GitHub Advisory Database Sep 1, 2022
Reviewed Sep 1, 2022
Last updated Jan 30, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

EPSS score

0.044%
(11th percentile)

Weaknesses

CVE ID

CVE-2022-36035

GHSA ID

GHSA-xwf3-6rgv-939r

Source code

Credits

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