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Security Advisories: GSA_kwCzR0hTQS1ndmg5LXhncnEtcjhod84AA7Sp

Rancher's Steve API Component Improper authorization check allows privilege escalation

Impact

A flaw discovered in Rancher versions from 2.5.0 up to and including 2.5.9 allows an authenticated user to impersonate any user on a cluster through the Steve API proxy, without requiring knowledge of the impersonated user's credentials. This is due to the Steve API proxy not dropping the impersonation header before sending the request to the Kubernetes API. A malicious user with authenticated access to Rancher could use this to impersonate another user with administrator access in Rancher, receiving, then, administrator level access in the cluster.

Patches

Patched versions include releases 2.5.10, 2.6.0 and later versions.

Workarounds

Limit access in Rancher to trusted users. There is not a direct mitigation besides upgrading to the patched Rancher versions.

For more information

If you have any questions or comments about this advisory:

Reach out to SUSE Rancher Security team for security related inquiries.
Open an issue in Rancher repository.
Verify our support matrix and product support lifecycle.

Permalink: https://github.com/advisories/GHSA-gvh9-xgrq-r8hw
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ndmg5LXhncnEtcjhod84AA7Sp
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 10 days ago
Updated: 10 days ago

CVSS Score: 8.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-gvh9-xgrq-r8hw, CVE-2021-36776
References:

Blast Radius: 14.1

Affected Packages

go:github.com/rancher/rancher

Dependent packages: 30
Dependent repositories: 40
Downloads:
Affected Version Ranges: >= 2.5.0, <= 2.5.9
Fixed in: 2.5.10
All affected versions:
All unaffected versions: 0.4.0, 0.4.2, 0.4.3, 0.5.0, 0.6.0, 0.7.0, 0.8.0, 0.9.0, 0.9.1, 0.10.0, 0.10.1, 0.11.0, 0.11.1, 0.12.0, 0.13.0, 0.13.1, 0.14.0, 0.14.1, 0.14.2, 0.15.0, 0.15.1, 0.16.0, 0.16.1, 0.16.2, 0.16.3, 0.17.0, 0.17.1, 0.18.0, 0.18.1, 0.18.2, 0.19.0, 0.19.1, 0.19.2, 0.20.0, 0.20.1, 0.20.2, 0.20.3, 0.20.4, 0.21.0, 0.21.1, 0.21.2, 0.21.3, 0.21.4, 0.24.0, 0.25.0, 0.28.0, 0.30.0, 0.31.0, 0.32.0, 0.34.0, 0.35.0, 0.37.0, 0.37.1, 0.38.0, 0.38.1, 0.39.0, 0.40.0, 0.41.0, 0.42.0, 0.43.0, 0.43.1, 0.44.0, 0.46.0, 0.47.0, 0.49.0, 0.49.1, 0.50.0, 0.50.1, 0.50.2, 0.51.0, 0.56.0, 0.56.1, 0.59.0, 0.59.1, 0.63.0, 0.63.1, 1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 1.5.7, 1.5.8, 1.5.9, 1.5.10, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.8, 1.6.9, 1.6.10, 1.6.11, 1.6.12, 1.6.13, 1.6.14, 1.6.15, 1.6.16, 1.6.17, 1.6.18, 1.6.19, 1.6.20, 1.6.21, 1.6.22, 1.6.23, 1.6.24, 1.6.25, 1.6.26, 1.6.27, 1.6.28, 1.6.29, 1.6.30, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.0.15, 2.0.16, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.1.7, 2.1.8, 2.1.9, 2.1.10, 2.1.11, 2.1.12, 2.1.13, 2.1.14, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.2.7, 2.2.8, 2.2.9, 2.2.10, 2.2.11, 2.2.12, 2.2.13