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GHSA-6758-979h-249x

MediumCVSS 4.3 / 10
Published Nov 7, 2023·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

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.

Risk Scores
Base Score
4.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.

Threat Intelligence
4.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.41%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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