T08 · Insecure Dependencies
- Location
SKILL.md:25- Finding
Unpinned Third-Party CLI Dependency
- Content
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Vulnerability Details
File Location:
SKILL.md:25
Vulnerability Type: Unpinned third-party dependency from a non-core Homebrew tap
Risk Level: MediumVulnerable Code:
bash brew install ossianhempel/tap/things3-cliTechnical Analysis
The documented installation command retrieves
things3-clifrom the third-party Homebrew tapossianhempel/tapwithout pinning an immutable release, formula commit, artifact checksum, or other integrity-verification value.Homebrew formulas control the source artifacts and installation or build steps performed on the user's system. Because this command follows the tap's mutable current state, the executable and installation logic obtained by a future user may differ from what was available when this Skill was audited. A compromised maintainer account, repository, formula, release asset, or upstream distribution could therefore introduce malicious code through the documented setup process.
Attack Path
- An attacker compromises the third-party tap, its maintainer account, the referenced upstream release, or another relevant supply-chain component.
- The attacker modifies the formula or distributed artifact to contain malicious installation logic or executable code.
- A user follows the Skill's setup instruction and runs:
bash brew install ossianhempel/tap/things3-cli - Homebrew retrieves the mutable, attacker-controlled package definition or artifact.
- Malicious code executes during installation or when the Agent later invokes the apparently legitimate
thingscommand. - The code acts with the privileges and data access available to the installing user and the Agent's execution context.
Impact Assessment
Successful exploitation could allow arbitrary code execution with the installing user's privileges. The affected scope could include local Things 3 records, files readable by the user, and environment variables available ...[truncated 432 chars]
- Remediation
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Remediation Suggestions
- Pin the dependency to a reviewed, immutable release or formula commit rather than installing the latest mutable version.
- Document the authoritative source repository, expected version, and cryptographic checksum of the reviewed artifact.
- Verify downloaded artifacts against a trusted checksum or signature before installation.
- Prefer an official, reproducible distribution channel where available.
- Review formula changes before upgrades and require explicit approval for dependency-version changes.
- Run the CLI with the minimum permissions needed and avoid exposing unrelated credentials in its environment.
- Grant Full Disk Access only when local database access demonstrably requires it, and revoke that permission when it is no longer needed.
