T08 · Insecure Dependencies
Warning
- Location
- SKILL.md:91
- Finding
- Unpinned Third-Party Package Execution Through npx## Vulnerability Details **File Location**: `SKILL.md`, lines 91–93 **Vulnerability Type**: Unpinned third-party dependency execution **Risk Level**: Medium **Complete Code Snippet**: ```bash npx @springmint/x402-payment \ --url "https://www.cpbox.io/api/x402/llm-context?q=rust+ownership&maximum_number_of_tokens=4096" \ --method GET ``` ### Technical Analysis The documented command invokes `@springmint/x402-payment` through `npx` without specifying an exact package version. Depending on the local npm environment, `npx` can retrieve and execute the package version currently resolved by the registry. The project provides no lockfile, integrity hash, vendored implementation, or other mechanism that binds this example to an audited package artifact. This creates a mutable supply-chain execution path: the code that users execute may differ from the code available when the skill was reviewed. The exposure is particularly sensitive because the documentation states that this dependency automatically signs and settles x402 payments. There is no evidence in the reviewed file that the package is currently malicious; the finding concerns the unsafe, unpinned execution mechanism. ### Attack Path 1. An attacker compromises the package publisher account, registry distribution path, or a future package release. 2. The attacker publishes a malicious version under the same package name. 3. A user follows the documented unversioned `npx` command. 4. `npx` resolves, downloads, and executes the attacker-controlled release. 5. Malicious installation or runtime code executes with the privileges of the user running the command. 6. That code may inspect accessible environment variables, files, wallet configuration, or payment-signing context and may initiate unauthorized operations within those privileges. ### Impact Assessment Successful exploitation could provide arbitrary code execution with the invoking user's privileges. Th ...[truncated 477 chars]
- Remediation
- ## Remediation Suggestions - Pin the package to a reviewed exact version, for example `@springmint/x402-payment@X.Y.Z`, rather than relying on the registry's current resolution. - Install the dependency as part of a controlled project setup and commit the generated lockfile. - Enforce package integrity verification and verify registry provenance, publisher identity, and release signatures where available. - Review the resolved package, transitive dependencies, and lifecycle scripts before allowing access to payment credentials. - Avoid one-shot remote package execution for payment-sensitive operations. Prefer a locally installed, audited binary invoked with options that prohibit implicit downloads. - Disable dependency lifecycle scripts where operationally possible and execute the payment client in a sandbox with minimal filesystem, environment, wallet, and network access. - Require explicit transaction limits and user confirmation before signing or settling payments.