T08 · Insecure Dependencies
Warning
- Location
- SKILL.md:85
- Finding
- Unpinned Third-Party Package Execution Through npx## Vulnerability Details **File Location**: `SKILL.md`, lines 85–94 **Vulnerability Type**: Unpinned third-party dependency execution **Risk Level**: Medium ### Vulnerable Code ```markdown ## Using with x402-payment ### CLI (AI Agent) ```bash npx @springmint/x402-payment \ --url https://www.cpbox.io/api/x402/answers \ --method POST \ --input '{"messages":[{"role":"user","content":"How does the James Webb Space Telescope work?"}],"model":"default","stream":false}' ``` ``` ### Technical Analysis The documented command invokes `@springmint/x402-payment` through `npx` without specifying an exact package version or enforcing an integrity hash. If the package is not already installed locally, `npx` can retrieve and immediately execute a package release from the configured npm registry. This creates a supply-chain trust boundary in which the executed implementation can change after the Skill has been reviewed. Compromise of the package publisher account, registry resolution, or a future package release could cause attacker-controlled code to run when an agent follows the documented integration procedure. The risk is elevated because the package is expected to handle an x402 payment handshake and EIP-712 signing. ### Attack Path 1. An attacker compromises the upstream package, its publisher account, or the dependency publication process. 2. A malicious version of `@springmint/x402-payment` is published or otherwise resolved by the runtime. 3. An agent follows `SKILL.md` and executes the unversioned `npx @springmint/x402-payment` command. 4. `npx` downloads and runs the attacker-controlled package with the invoking process's operating-system privileges. 5. The malicious package can inspect accessible environment data and payment-related material, manipulate API requests or payment destinations, and perform other actions permitted to the process. ### Impact Assessment Successful exploitation can provide ar ...[truncated 555 chars]
- Remediation
- ## Remediation Suggestions 1. Pin the package to a specifically reviewed version, such as `@springmint/x402-payment@X.Y.Z`, rather than resolving the latest available release. 2. Install dependencies through a committed lockfile containing registry URLs and integrity metadata, and use a deterministic installation command such as `npm ci`. 3. Verify package provenance, publisher identity, release signatures, and integrity before approving upgrades. 4. Avoid automatic download-and-execute behavior in production. Prefer a separately reviewed installation stage followed by execution of the pinned local binary. 5. Run the payment client in a restricted environment with minimal filesystem access, filtered network egress, sanitized environment variables, and no unrelated credentials. 6. Scope payment and EIP-712 signing authorization to the expected domain, contract, network, amount, and request. Require explicit confirmation for values outside defined limits. 7. Monitor dependency advisories and review all version changes before updating the approved package.