vulnerability / NVI-00014123 / Revision 1
Kyverno's NamespacedGeneratingPolicy generator.apply() namespace argument unvalidated -- background controller creates RoleBindings in any namespace including kube-system
GitHub lists this reviewed advisory for github.com/kyverno/kyverno. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
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01 / Meaning
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9.6 critical
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As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/kyverno/kyverno
source listed>= 1.18.0, <= 1.18.1
## Summary In Kyverno v1.18.1, a tenant who can create a `NamespacedMutatingPolicy` in their own namespace can instruct the admission controller to generate resources in any namespace by passing an arbitrary namespace string to the CEL `generator.apply(namespace, resources)` function. ## Details `pkg/cel/libs/context.go:177` declares `GenerateResources(namespace string, dataList []map[string]any)`. The `namespace` argument arrives unvalidated from the CEL expression `generator.apply("", [...])`. ### Version-Specific Impact **v1.18.0, v1.18.1 (affected via NamespacedMutatingPolicy only):** The nmpol CEL compiler unintentionally exposes the `generator` library to match condition expressions. A namespaced mutating policy can invoke `generator.apply()` in a boolean CEL expression such as `matchConditions`, triggering the admission controller to generate resources in any namespace at request time. This side effect executes with the admission controller's cluster-wide privileges. NamespacedGeneratingPolicy is **not** a vector in v1.18.1 due to incomplete webhook and background processing wiring (not registered or functional). ### Root Cause The admission valida
03 / Response
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04 / Limits
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05 / Provenance
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- GHSA-79gf-7frw-68m9 ↗
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- Revision 1 ·
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