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Security Advisories: GSA_kwCzR0hTQS13Mmo1LTNyY3gtdng3eM0y7Q

Sysctls applied to containers with host IPC or host network namespaces can affect the host

Impact

Before setting the sysctls for a pod, the pods namespaces must be unshared (created). However, in cases where the pod is using a host network or IPC namespace, a bug in CRI-O caused the namespace creating tool pinns to configure the sysctls of the host. This allows a malicious user to set sysctls on the host, assuming they have access to hostNetwork and hostIPC.

Any CRI-O cluster after CRI-O 1.18 that drops the infra container
1.22 and 1.23 clusters drop infra container by default, and are thus vulnerable by default.

Patches

CRI-O versions 1.24.0, 1.23.1, 1.22.2, 1.21.5, 1.20.6, 1.19.5 all have the patches.

Workarounds

Users can set manage_ns_lifecycle to false, which causes the sysctls to be configured by the OCI runtime, which typically filter these cases. This option is available in 1.20 and 1.19. Newer versions don't have this option.
An admission webhook could also be created to deny pods that use host IPC or network namespaces and also attempt to configure sysctls related to that namespace.

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-w2j5-3rcx-vx7x
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS13Mmo1LTNyY3gtdng3eM0y7Q
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 2 years ago
Updated: over 1 year ago


Identifiers: GHSA-w2j5-3rcx-vx7x
References: Repository: https://github.com/cri-o/cri-o
Blast Radius: 0.0

Affected Packages

go:github.com/cri-o/cri-o
Dependent packages: 1
Dependent repositories: 61
Downloads:
Affected Version Ranges: >= 1.18.0, < 1.19.5, >= 1.20.0, < 1.20.6, >= 1.21.0, < 1.21.5, >= 1.22.0, < 1.22.2, >= 1.23.0, < 1.23.1
Fixed in: 1.19.5, 1.20.6, 1.21.5, 1.22.2, 1.23.1
All affected versions: 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.18.5, 1.18.6, 1.19.0, 1.19.1, 1.19.2, 1.19.3, 1.19.4, 1.20.0, 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.22.0, 1.22.1, 1.23.0
All unaffected versions: 0.0.0, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.8.0, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 1.9.5, 1.9.6, 1.9.7, 1.9.8, 1.9.9, 1.9.10, 1.9.11, 1.9.12, 1.9.13, 1.9.14, 1.9.15, 1.9.16, 1.10.0, 1.10.1, 1.10.2, 1.10.3, 1.10.4, 1.10.5, 1.10.6, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.11.5, 1.11.6, 1.11.7, 1.11.8, 1.11.9, 1.11.10, 1.11.11, 1.11.12, 1.11.13, 1.11.14, 1.11.15, 1.12.0, 1.12.1, 1.12.2, 1.12.3, 1.12.4, 1.12.5, 1.12.6, 1.12.7, 1.12.8, 1.12.9, 1.12.10, 1.13.0, 1.13.1, 1.13.2, 1.13.3, 1.13.4, 1.13.5, 1.13.6, 1.13.7, 1.13.8, 1.13.9, 1.13.10, 1.13.11, 1.13.12, 1.14.0, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.14.5, 1.14.6, 1.14.7, 1.14.8, 1.14.9, 1.14.10, 1.14.11, 1.14.12, 1.15.0, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.16.6, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.17.4, 1.17.5, 1.19.5, 1.19.6, 1.20.6, 1.20.7, 1.20.9, 1.21.5, 1.21.6, 1.21.7, 1.22.2, 1.22.3, 1.22.4, 1.22.5, 1.23.1, 1.23.2, 1.23.3, 1.23.4, 1.23.5, 1.24.0, 1.24.1, 1.24.2, 1.24.3, 1.24.4, 1.24.5, 1.24.6, 1.25.0, 1.25.1, 1.25.2, 1.25.3, 1.25.4, 1.25.5, 1.26.0, 1.26.1, 1.26.2, 1.26.3, 1.26.4, 1.27.0, 1.27.1, 1.27.2, 1.27.3, 1.27.4, 1.28.0, 1.28.1, 1.28.2, 1.28.3, 1.28.4, 1.29.0, 1.29.1, 1.29.2