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Security Advisories: GSA_kwCzR0hTQS02NzU4LTk3OWgtMjQ5eM4AA2-V

capsule-proxy service discloses Namespaces of colliding tenants to owners of different tenants with the same ServiceAccount name

Summary

A bug in the RoleBinding reflector used by capsule-proxy gives ServiceAccount tenant owners the right to list Namespaces of other tenants backed by the same owner kind and name.

Details

Tenant solar, owned by a ServiceAccount named tenant-owner in the Namespace solar
Tenant wind, owned by a ServiceAccount named tenant-owner in the Namespace wind

Please, notice the same ServiceAccount name, although in different namespaces.

The Tenant owner solar would be able to list the namespaces of the Tenant wind and vice-versa, although this is not correct.

The bug introduces an exfiltration vulnerability since allows the listing of Namespace resources of other Tenants, although just in some specific conditions:

capsule-proxy runs with the --disable-caching=false (default value: false)
Tenant owners are ServiceAccount, with the same resource name, but in different Namespaces.

The CVE doesn't allow any privilege escalation on the outer tenant Namespace-scoped resources, since the Kubernetes RBAC is enforcing this.

Permalink: https://github.com/advisories/GHSA-6758-979h-249x
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS02NzU4LTk3OWgtMjQ5eM4AA2-V
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 1 year ago
Updated: about 1 year ago

CVSS Score: 4.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Identifiers: GHSA-6758-979h-249x, CVE-2023-46254
References:

Repository: https://github.com/projectcapsule/capsule-proxy
Blast Radius: 1.0

Affected Packages

go:github.com/projectcapsule/capsule-proxy

Dependent packages: 0
Dependent repositories: 0
Downloads:
Affected Version Ranges: <= 0.4.4
Fixed in: 0.4.5
All affected versions: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.1.0, 0.1.1, 0.2.0, 0.2.1, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.4.4
All unaffected versions: 0.4.5, 0.4.6, 0.4.7, 0.4.8, 0.5.0, 0.6.0, 0.7.0, 0.7.1, 0.7.2

go:github.com/projectcapsule/capsule

Dependent packages: 0
Dependent repositories: 0
Downloads:
Affected Version Ranges: <= 0.4.4
Fixed in: 0.4.5
All affected versions: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.2.0, 0.2.1, 0.2.2, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.4.0, 0.4.1, 0.4.2
All unaffected versions: 0.5.0, 0.6.0, 0.6.1, 0.6.2, 0.7.0, 0.7.1, 0.7.2