Fastlane

• Outcome: Review
• Latest audit: Sep 11, 2026 · 9:24 AM UTC
• Version: 1.0.0

Overview

This Fastlane skill is mostly coherent documentation, but it includes privileged installation and production App Store release commands without enough user-control safeguards.

Review release commands carefully before installing or using this skill. Prefer `brew install fastlane` or a pinned Bundler setup over the sudo RubyGems fallback, and require explicit approval before any command that submits for review, automatically releases, uses `--force`, or changes signing assets.

A.I.G

Vulnerability Patterns

• Insecure Dependencies: Introduces malicious components through unsafe dependency sources
• Skill Instruction Hijacking: Alters the agent's session goals or safety constraints when the skill loads
• Agent Memory Poisoning: Writes attacker-controlled rules into memory that affect later sessions
• Remote Payload Retrieval and Execution: Fetches external code whose behavior can change after review
• Embedded Malicious Code: Ships malicious scripts inside the skill and executes them locally

Findings (1)

T08 · Insecure Dependencies

Error

• Location: SKILL.md:27

Finding

Unpinned Remote RubyGem Installation with Root Privileges

Content

View full analysis

Vulnerability Details

File Location: SKILL.md, lines 27–30
Vulnerability Type: Unsafe privileged dependency installation
Risk Level: High

Vulnerable code:

bash

Or via RubyGems:

```bash
sudo gem install fastlane -NV

text

### Technical Analysis

The documented fallback installs Fastlane and its dependency chain from the remote RubyGems ecosystem while running the package installation process with root privileges. The command does not pin a reviewed version, use a lockfile, verify package integrity, or restrict installation to an unprivileged account.

Ruby packages may execute installation hooks or native-extension build logic during installation. Therefore, compromise of a selected Fastlane release, a transitive dependency, the package registry, or the dependency-resolution process could cause attacker-controlled code to execute as root.

Installing a command-line dependency system-wide as root exceeds the minimum privileges needed for the Skill's app automation functionality. The primary Homebrew installation documented elsewhere in the Skill does not justify retaining an unrestricted `sudo gem install` fallback.

### Attack Path

1. An attacker compromises a package version or transitive dependency selected by the unpinned RubyGems resolution process.
2. A user or agent follows the fallback installation instruction.
3. `sudo` starts the RubyGems installation process with root privileges.
4. RubyGems downloads the mutable, remotely supplied package and its dependencies.
5. Malicious installation logic or native-extension build code executes in the privileged installation context.
6. The attacker can modify system files, install persistent components, access root-readable data, or tamper with development and signing tooling.

### Impact Assessment

Successful exploitation can provide arbitrary code execution with root privileges on the machine performing the installation. The resulting ac
...[truncated 444 chars]

Remediation

View remediation

Remediation Suggestions

• Remove sudo and use a user-scoped Ruby environment such as rbenv, asdf, or an appropriately configured per-user gem directory.
• Prefer the documented Homebrew installation where suitable.
• For reproducible project or CI usage, declare Fastlane in a Gemfile, pin an audited version, commit Gemfile.lock, and invoke it with bundle exec fastlane.
• Avoid unconstrained installation of the latest available package release.
• Verify dependency provenance and integrity using ecosystem-supported checks, and review lockfile changes before upgrades.
• Run installation and Fastlane execution under a dedicated, minimally privileged CI account.
• Isolate release jobs and limit their access to signing keys and App Store credentials to the shortest necessary duration.

SkillSpector

Vulnerability Patterns

• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code
• Excessive Agency: Unrestricted Tool Access, Autonomous Decision Making, Scope Creep

Findings (3)

Credential Access

High

• Category: Privilege Escalation
• Confidence: 70% confidence

Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 691)May include surrounding context.

md

| Variable | Purpose |
|---|---|
| `CI` | Set to `true` on CI environments |
| `FASTLANE_DONT_STORE_PASSWORD` | Don't save passwords to keychain |
| `MATCH_KEYCHAIN_NAME` | Keychain name for CI |
| `MATCH_KEYCHAIN_PASSWORD` | Keychain password for CI |

Sudo/Root Execution

Medium

• Category: Privilege Escalation
• Confidence: 82% confidence

Finding

The skill recommends sudo gem install fastlane -NV, which instructs users or agents to run a package installation with root privileges. Running language package managers as root expands the blast radius of compromised dependencies, install scripts, or user mistakes, and is especially risky in an automation setting where commands may be executed without scrutiny.

Content

Scanner excerpt · SKILL.md (reported line 30)May include surrounding context.

Or via RubyGems:

bash

sudo gem install fastlane -NV

After install, add to your shell profile:

Missing User Warnings

Medium

• Category: Not specified by scanner
• Confidence: 89% confidence

Finding

The workflow shows fastlane deliver --submit_for_review --automatic_release --force, which can publish an app update with minimal friction and no adjacent warning about production impact or need for explicit user confirmation. In an agent skill context, this is more dangerous than ordinary documentation because an automation agent may translate examples directly into actions, increasing the risk of unintended release to the App Store.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.