T08 · Insecure Dependencies
Warning
- Location
SKILL.md:13- Finding
Unpinned Third-Party Package Download and Execution
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 13-17
Vulnerability Type: Supply-chain risk caused by unpinned package execution
Risk Level: MediumVulnerable Code:
markdown Start BugPack server first: ```bash npx bugpack-mcptext ### Technical Analysis The prerequisite directs users to run `npx bugpack-mcp` without specifying an exact, reviewed package version. Depending on the local npm environment, `npx` can retrieve the current package release from the configured registry and immediately execute its lifecycle or runtime code. The package content can therefore change after this Skill has been reviewed. The instructions do not require a lockfile, integrity verification, trusted registry, provenance check, or validation of the package's official source. Although the audit did not establish that `bugpack-mcp` is malicious, this mutable dependency-execution pattern creates an avoidable supply-chain exposure. ### Attack Path 1. An attacker compromises the npm publisher account, package distribution process, or configured registry, or gains control of the referenced package. 2. The attacker publishes a malicious package release under the same package name. 3. A user follows the Skill prerequisite and executes `npx bugpack-mcp`. 4. `npx` retrieves the mutable package version from the registry. 5. Malicious lifecycle or runtime code executes locally with the privileges of the invoking user. ### Impact Assessment Successful exploitation could provide arbitrary code execution with the invoking user's permissions. The resulting access could include reading or modifying files available to that user, accessing environment variables and locally available credentials, making network requests, and altering project source code. The Skill itself does not request elevated operating-system privileges, so the direct impact is bounded by the permissions of the user running `npx`.- Remediation
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Remediation Suggestions
- Pin
bugpack-mcpto an exact version that has been reviewed, rather than resolving the latest mutable release. - Install it through a committed lockfile with integrity metadata.
- Require a trusted npm registry and document the package's verified official publisher and source repository.
- Verify package provenance, signatures, and integrity before execution where supported.
- Disable or carefully review dependency lifecycle scripts when feasible.
- Prefer shipping or vendoring reviewed server code when operationally practical.
- Run the server with minimal user permissions and isolate it from unrelated credentials and sensitive files.
- Pin