T08 · Insecure Dependencies
Warning
- Location
- SKILL.md:46
- Finding
- Unpinned Third-Party Package Download and Execution## Vulnerability Details **File Location**: `SKILL.md`, lines 46-49 **Vulnerability Type**: Unpinned third-party dependency executed through `npx` **Risk Level**: Medium **Vulnerable Code**: ```bash npx @springmint/x402-payment \ --url "https://www.cpbox.io/api/x402/images-search?q=mountain+landscape&count=20" \ --method GET ``` ### Technical Analysis The documented workflow invokes `@springmint/x402-payment` through `npx` without specifying a package version, integrity hash, or reviewed lockfile. If the package is not already available locally, `npx` may retrieve the current release from the configured npm registry and immediately execute it. The effective executable code can therefore change after the Skill has been reviewed. The audited project does not contain the package implementation, a dependency manifest, or a lockfile through which its exact contents and integrity could be verified. This creates a third-party software supply-chain risk. The package is also documented as handling automatic payment signing. Consequently, compromise or malicious modification of the package could affect both the local execution environment and payment-related credentials or requests. ### Attack Path 1. An attacker compromises the npm package, its publisher account, its dependency chain, or the registry resolution path. 2. The attacker publishes or causes resolution to a malicious release of `@springmint/x402-payment`. 3. A user or agent follows the command documented in `SKILL.md`. 4. `npx` downloads the mutable, unpinned package release. 5. The downloaded package executes with the permissions and environment of the invoking process. 6. Malicious code could inspect accessible payment credentials, alter payment operations, read or modify accessible files, or initiate unrelated network requests. ### Impact Assessment Successful exploitation could provide arbitrary code execution under the invoking user's privilege ...[truncated 503 chars]
- Remediation
- ## Remediation Suggestions 1. Pin `@springmint/x402-payment` to a specific, reviewed version rather than allowing `npx` to resolve the latest release. 2. Declare the dependency in a package manifest and commit a lockfile containing registry and integrity metadata. 3. Install dependencies separately using a reproducible, frozen-lockfile workflow; invoke the verified local binary instead of permitting ad hoc downloads during Skill execution. 4. Verify package provenance, signatures, publisher identity, and integrity before installation. 5. Audit the pinned package and its transitive dependencies, and use automated dependency monitoring for later security advisories. 6. Run payment tooling in a sandbox or restricted account with minimum filesystem and network permissions. 7. Use isolated payment credentials with explicit per-transaction and aggregate spending limits. 8. Require clear user confirmation before signing or submitting any payment.