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Advisories

Kyverno before 1.19.2 Privilege Escalation via Generate Rule Permission Check

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Severity
critical
Date
Affecting

  • kyverno >= 0, < 1.19.2

CWE
  • CWE-269 Improper Privilege Management
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Trenyx
Description
Kyverno before 1.19.2 contains a privilege escalation vulnerability that allows namespace admins to create resources beyond their RBAC because generate-rule admission checks verify the controller's permissions, not the author's. Attackers can create a namespaced Policy with generate rules targeting other namespaces or cluster-scoped kinds, making the background controller create or clone resources cluster-wide.

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