vulnerability / NVI-00017730 / Revision 1
Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape
GitHub lists this reviewed advisory for github.com/fission/fission. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
9.9 critical
GitHub source severity; exploitability and local consequence require separate evidence.
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/fission/fission
source listed<= 1.23.0
### Summary Fission's `Environment` CRD exposes `spec.runtime.podSpec` and `spec.builder.podSpec`, which are merged into the Kubernetes pod specs for runtime and builder pods. The merge logic propagated `hostNetwork`, `hostPID`, `hostIPC`, container `privileged`, and `serviceAccountName` from the user-supplied podspec with no filtering, and `Environment.Validate` performed no security-relevant checks on these fields. ### Details A namespace user with `create`/`update` on `environments.fission.io` could produce privileged, host-network, hostPID pods in the Fission function or builder namespace. Because the Helm chart created the `fission-function` and `fission-builder` namespaces with no `pod-security.kubernetes.io/enforce` labels, Kubernetes Pod Security Admission did not catch the escape either. From a host-network privileged pod with hostPID, the attacker could `nsenter` into the host, read cloud-metadata credentials, access the container-runtime socket, pivot to other namespaces, and fully compromise the node. ### Impact `environments.fission.io` create/update RBAC is escalated to node compromise — host filesystem and network access on the scheduling node, and from there
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-gx55-f84r-v3r7 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.