Kubewarden trusted-repos-policy: uppercase registry host bypasses registry/image deny rules

policies · CWE-178 · CWE-178

Affectedpolicies

FixNo fix listed yet.

PublishedOct 30, 22:08 · GitHub_M

ScoredOct 30 · 6.3 · GitHub_M

Exploit code publicNone known · checked 21:18 UTC

ExploitedNone known · CISA KEV checked 22:07 UTC

What we know

No known exploitation. CISA KEV, checked 22:07 UTC.

No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.

An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.

Someone has to open, click or run something first. CVSS: user interaction required.

Description

Kubewarden policies is a collection of WebAssembly policies for securing and governing Kubernetes clusters. For versions provisionally classified as affected before 2.1.2, `trusted-repos-policy` compares an image's `registry` hostname against `reject lists` and `allow lists` case-sensitively even though `registry` DNS names are case-insensitive. An image with an uppercase or mixed-case `registry` hostname can miss a rejection rule for the equivalent lowercase host, so the admission policy accepts a resource whose container runtime pulls the same prohibited image. Only reject-list configurations have this bypass: allow-list configurations fail closed by over-denying differently cased hostnames. The security consequences depend on the configured rejection policy and deployment environment. This issue is fixed in version 2.1.2.

From GitHub_M

Affected and fixed versions

ProductAffectedFixed inpolicies< 2.1.2–

Exploit code

Exploit-DBnone knownMetasploitnone knownNucleinone known

References

github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272p · github.comrefsource_CONFIRM github.com/kubewarden/policies/commit/bc5597fcbbb0bc464b714ca7ff645c9743dea41b · github.comrefsource_MISC github.com/kubewarden/policies/tree/trusted-repos-policy/v2.1.2 · github.comrefsource_MISC