T08 · Insecure Dependencies
Warning
- Location
- SKILL.md:11
- Finding
- Unpinned Third-Party CLI Installation Creates a Supply-Chain Risk## Vulnerability Details **File Location**: `SKILL.md`, lines 11–18 **Vulnerability Type**: Unpinned and unverified third-party dependencies **Risk Level**: Medium **Complete Code Snippet**: ```markdown Install - Homebrew (macOS/Linux): `brew tap aronjanosch/tap && brew install sparky-cli` - Build from source (requires Go 1.21+): ``` git clone https://github.com/aronjanosch/sparky-cli cd sparky-cli go build -o sparky . sudo mv sparky /usr/local/bin/ ``` ``` ### Technical Analysis Both documented installation methods retrieve mutable upstream content without pinning an immutable release, commit, formula revision, checksum, or cryptographic signature. The Homebrew method trusts a custom third-party tap and whatever package definition it serves at installation time. The source-build method clones the repository's current default branch and immediately compiles it. Consequently, the effective code installed by users can change after this skill has been reviewed. The skill's homepage points to `CodeWithCJ/SparkyFitness`, while the CLI installation sources use the `aronjanosch` account. This is not proof of malicious behavior, but the documentation does not establish or verify the trust relationship between those maintainers. The final command uses `sudo` to place the resulting executable in `/usr/local/bin`, making integrity verification especially important. ### Attack Path 1. An attacker compromises the third-party GitHub repository, Homebrew tap, maintainer account, or release infrastructure. 2. The attacker modifies the CLI source or Homebrew formula to include malicious behavior. 3. A user follows the documented installation instructions, which fetch the current mutable upstream content without integrity verification. 4. The user builds or installs the modified CLI and places it in a system-wide executable directory. 5. The user configures the CLI with a SparkyFitness server URL and API key and ...[truncated 1016 chars]
- Remediation
- ## Remediation Suggestions 1. Pin source installations to a reviewed release tag and immutable commit hash rather than cloning the current default branch. 2. Prefer official, versioned release artifacts and publish SHA-256 checksums for every supported platform. 3. Cryptographically sign releases and Homebrew formula updates, and document how users must verify those signatures. 4. Pin the Homebrew formula to a specific release archive with a verified checksum. Avoid installation instructions that depend on mutable branch archives. 5. Clearly document the relationship between the SparkyFitness project owner and the separate CLI and tap maintainers. 6. Recommend installation into a user-owned directory such as `~/.local/bin` instead of requiring `sudo` where feasible. 7. Add dependency and source provenance review to the release process, including automated vulnerability scanning and reproducible-build verification. 8. Document the exact expected CLI version in the skill metadata and provide an upgrade process that repeats integrity verification.