T08 · Insecure Dependencies
Warning
- Location
- SKILL.md:242
- Finding
- Unpinned Third-Party Package Execution Through npx## Vulnerability Details **File Location**: `SKILL.md`, lines 242-246 **Vulnerability Type**: Unpinned dependency retrieval and execution **Risk Level**: Medium ```bash # Simplest method: directly use the official server HOST=localhost PORT=1234 npx y-websocket ``` ### Technical Analysis The skill recommends executing `y-websocket` through `npx` without specifying a reviewed package version, requiring a lockfile, verifying an integrity hash, or ensuring that the package is already installed locally. When the requested package is unavailable locally, `npx` can retrieve executable package content from the configured package registry and run it immediately. The effective code may therefore differ from the code available when this skill was audited. Referring to the package as the “official server” does not verify the integrity or provenance of the package version resolved at execution time. This creates a supply-chain exposure: compromise of the package, its publisher account, the registry resolution path, or a future release could cause arbitrary package code to run on the user's system. No evidence establishes that the current `y-websocket` package is malicious; the vulnerability is the unsafe, unpinned execution mechanism. ### Attack Path 1. A user requests help configuring a Yjs collaboration server. 2. The agent follows the command documented in `SKILL.md`. 3. `npx` resolves `y-websocket` without a fixed version or integrity constraint. 4. If the package is not already available locally, `npx` retrieves the currently resolved package from the configured registry. 5. A compromised or maliciously changed package version executes through its CLI or package lifecycle behavior. 6. The package code runs with the privileges and environment access of the account that invoked `npx`. Exploitation depends on compromise or malicious modification of the resolved dependency or its distribution channel. ### Impact Assessment ...[truncated 675 chars]
- Remediation
- ## Remediation Suggestions 1. Pin `y-websocket` to a specific, reviewed version rather than resolving the latest available release. 2. Declare the dependency in the project manifest and commit the generated lockfile. 3. Install dependencies using a lockfile-enforcing command such as `npm ci`. 4. Run the locally installed binary, or use `npx --no-install y-websocket`, so execution fails instead of downloading unreviewed code. 5. Enable registry integrity verification and review the package's provenance, maintainers, release history, and transitive dependencies. 6. Run the collaboration server under a dedicated, least-privileged account or container with restricted filesystem, credential, and network access. 7. Replace the current example with a controlled workflow, such as: ```bash npm install --save-exact y-websocket@<reviewed-version> npm exec --no -- y-websocket ``` The selected version should also be recorded and integrity-locked in the project's lockfile.