GHSA-6758-979h-249x

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Source
https://github.com/advisories/GHSA-6758-979h-249x
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/11/GHSA-6758-979h-249x/GHSA-6758-979h-249x.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-6758-979h-249x
Aliases
Related
Published
2023-11-07T21:46:04Z
Modified
2023-11-08T04:13:41.985370Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
capsule-proxy service discloses Namespaces of colliding tenants to owners of different tenants with the same ServiceAccount name
Details

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:

  1. capsule-proxy runs with the --disable-caching=false (default value: false)
  2. 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.

Database specific 
{
    "nvd_published_at": "2023-11-06T19:15:09Z",
    "cwe_ids": [
        "CWE-200"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2023-11-07T21:46:04Z"
}
References

Affected packages

Go / github.com/projectcapsule/capsule

Package

Name
github.com/projectcapsule/capsule
View open source insights on deps.dev
Purl
pkg:golang/github.com/projectcapsule/capsule

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.4.5

Database specific 

{
    "last_known_affected_version_range": "<= 0.4.4"
}

Go / github.com/projectcapsule/capsule-proxy

Package

Name
github.com/projectcapsule/capsule-proxy
View open source insights on deps.dev
Purl
pkg:golang/github.com/projectcapsule/capsule-proxy

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.4.5

Database specific 

{
    "last_known_affected_version_range": "<= 0.4.4"
}