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Advisories

kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

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severity
critical
date
Affecting

  • kyverno >= 0, < 1.19.1

CWE
  • CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')
CVSS
9.4
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
cherez0ff
Description
kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.

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