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Advisories

Kyverno 1.19.1 Privilege Escalation via apiCall Namespace Clamp Bypass

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Severity
critical
Date
Affecting

  • kyverno >= 1.19.1, < 1.19.2

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
WarlordSam07
Description
Kyverno from 1.19.1 before 1.19.2 contains an authorization bypass vulnerability in the apiCall namespace clamp that allows namespace tenants to issue cross-namespace and cluster-scoped API requests by appending malformed percent-escapes to urlPath. Attackers can create namespaced Policies whose apiCall runs as the admission-controller ServiceAccount to read other namespaces' resources and create mutating webhooks, escalating to cluster admin.

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