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Advisories

Kyverno before v1.13.0 Policy Bypass via Multiple Exceptions

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severity
critical
date
Affecting

  • kyverno >= 0, < 1.13.0

CWE
  • CWE-284 Improper Access Control
CVSS
9.4
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
r0binak
Description
Kyverno versions v1.9.0 through v1.12.7 contain a policy exception handling flaw. When a policy in enforce mode is combined with two PolicyExceptions, the less restrictive exception takes precedence, allowing an attacker to bypass the policy by crafting a resource name that matches the second exception's name pattern (e.g., '*ingress*'). This can be used to circumvent policies such as one blocking hostPath volumes. Fixed in v1.13.0.

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