T08 · Insecure Dependencies
- Location
skill.md:14- Finding
Unpinned Third-Party CLI Installation Creates a Supply-Chain Risk
- Content
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Vulnerability Details
File Location:
skill.md, lines 14-29
Vulnerability Type: Unpinned and mutable third-party dependencies
Risk Level: Mediumyaml "install": [ { "id": "brew", "kind": "brew", "formula": "buddyh/tap/alexacli", "bins": ["alexacli"], "label": "Install alexacli (brew)", }, { "id": "go", "kind": "go", "module": "github.com/buddyh/alexa-cli/cmd/alexa@latest", "bins": ["alexacli"], "label": "Install alexa-cli (go)", }, ],Technical Analysis
The Skill defines two installation sources for the
alexacliexecutable without pinning either source to an audited immutable version. The Go installation explicitly uses the mutable@latestselector. The Homebrew installation relies on the external third-party tapbuddyh/tapwithout declaring a version, commit, checksum, or signature.Consequently, the code installed in the future may differ from the code that was reviewed. If the upstream repository, release process, maintainer account, Go module, or Homebrew tap is compromised, a malicious update could be distributed through the legitimate installation instructions.
This dependency is security-sensitive because the installed executable authenticates to Amazon's unofficial Alexa API, can access locally stored Alexa credentials, and can issue commands to connected smart-home devices. The finding does not establish that the current upstream package is malicious; it identifies the absence of controls that would prevent a future upstream change from silently altering the installed payload.
Attack Path
- An attacker compromises the upstream project, a maintainer account, release infrastructure, Go module distribution path, or the third-party Homebrew tap.
- The attacker publishes a mali ...[truncated 1472 chars]
- Remediation
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Remediation Suggestions
- Replace
@latestwith a specific audited release or immutable commit identifier. - Pin the Homebrew installation to a reviewed version rather than implicitly installing the current formula.
- Publish and verify cryptographic checksums for release artifacts before installation.
- Prefer signed releases and validate signatures against a documented, trusted maintainer key.
- Where feasible, use an official or otherwise independently trusted distribution channel instead of an unverified third-party tap.
- Record the exact reviewed dependency version and digest in the Skill metadata so future updates require explicit review.
- Run the CLI with least privilege and restrict access to its credential file using appropriate filesystem permissions.
- Avoid exposing refresh tokens broadly through inherited environment variables, logs, or debugging output.
- Establish a dependency-update process that reviews source changes and regenerates trusted hashes before changing the pinned version.
- Replace
