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Firebase Apk Scanner

Listed
trailofbits·vlatest·backend·CC-BY-SA-4.0

Identifies potential security vulnerabilities within Android APKs deployed to Firebase projects using static analysis.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add trailofbits/skills --skill firebase-apk-scanner -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

trailofbits

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill failed 1 of 6 checks. A failure is not proof of bad intent; it means something in the code needs a human to look at it before you run it.

  • No undeclared network calls: failed

    Contacts 7 hosts that are neither well-known infrastructure nor declared in the skill's frontmatter: firebaseremoteconfig.googleapis.com, firebasestorage.googleapis.com, firestore.googleapis.com, identitytoolkit.googleapis.com, project-id.firebaseio.com….

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

    Hosts contacted

    firestore.googleapis.comundeclaredfirebasestorage.googleapis.comundeclaredproject.firebaseio.comundeclaredproject-id.firebaseio.comundeclaredus-central1-project.cloudfunctions.netundeclaredidentitytoolkit.googleapis.comundeclaredfirebaseremoteconfig.googleapis.comundeclared

    What it found (3 of 31)

    • plugins/firebase-apk-scanner/skills/firebase-apk-scanner/SKILL.md:178contacts firestore.googleapis.com
      curl -s "https://firestore.googleapis.com/v1/projects/PROJECT_ID/databases/(default)/documents"
    • plugins/firebase-apk-scanner/skills/firebase-apk-scanner/references/vulnerabilities.md:323contacts firestore.googleapis.com
      curl "https://firestore.googleapis.com/v1/projects/PROJECT-ID/databases/(default)/documents"
    • plugins/firebase-apk-scanner/skills/firebase-apk-scanner/references/vulnerabilities.md:326contacts firestore.googleapis.com
      curl "https://firestore.googleapis.com/v1/projects/PROJECT-ID/databases/(default)/documents/users"

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned trailofbits/skills at 82fe822625.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
82fe822625
Manifest
plugins/firebase-apk-scanner/skills/firebase-apk-scanner/SKILL.md
Scanned
4 files, 2,352 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

The firebase-apk-scanner skill analyzes Android APK files to detect potential security issues related to Firebase integration. It identifies misconfigurations, insecure API usage, and other vulnerabilities that could expose sensitive data or allow unauthorized access through Firebase services.

When to use it

  • You're auditing an Android app for Firebase-related security flaws before deployment.
  • Your team is investigating a breach suspected to involve Firebase misconfiguration.
  • You need to ensure third-party apps using your Firebase project are configured securely.

Key capabilities

  • Scans APK files for Firebase dependencies and configuration details
  • Detects insecure Firebase API usage patterns
  • Identifies potential misconfigurations in Firebase services

Example prompts

  • "Analyze this APK file for Firebase security issues."
  • "Check if the app is using deprecated or insecure Firebase APIs."
  • "Scan the provided Android APK for Firebase-related vulnerabilities."

Tips & gotchas

  • Ensure you have the correct APK file uploaded and accessible to the scanner.
  • The tool may not detect runtime issues that only occur under specific conditions.