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Advisories

Kyverno 1.19.1 before 1.19.2 Privilege Escalation via Policy apiCall urlPath

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Severity
critical
Date
Affecting

  • kyverno >= 1.19.1, < 1.19.2

CWE
  • CWE-436 Interpretation Conflict
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 from 1.19.1 before 1.19.2 validates a Policy's context.apiCall urlPath after cleaning it but executes the raw path, whose fragment or query the Kubernetes client discards. A namespace-scoped user who can create a Policy can hide ../ segments behind # or ? to reach cluster-scoped endpoints with Kyverno's ServiceAccount, gaining cluster admin.

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