T08 · Insecure Dependencies
- Location
SKILL.md:50- Finding
Unpinned Third-Party Dependency Installation
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 50–53
Vulnerability Type: Unpinned third-party dependency and unsafe supply-chain resolution
Risk Level: MediumComplete Code Snippet
bash # 建议在虚拟环境中安装（可选但推荐） python -m venv .venv && source .venv/bin/activate # Windows: .venv\Scripts\activate pip install fastmcpThe runtime subsequently imports the installed package in
reg_connector_server.py, line 25:python from fastmcp import FastMCPThe protocol test also imports components from the same package in
selftest_stdio.py, lines 13–14:python from fastmcp import Client from fastmcp.client.transports import StdioTransportTechnical Analysis
The installation instructions resolve
fastmcpand its transitive dependencies from the package index without a pinned version, lockfile, or cryptographic hash verification. Consequently, the actual code installed can differ between installations and can change after this Skill has been audited.Python packages may execute code during installation and whenever imported. Because the server directly imports
fastmcp, a compromised or malicious future release could execute with the privileges of the user running the installation or MCP server.The use of a virtual environment limits Python package conflicts but does not prevent malicious package code from accessing files, environment variables, credentials, or the network with the invoking user's permissions.
No evidence shows that the currently intended
fastmcppackage is malicious. The vulnerability is the uncontrolled dependency-resolution process.Attack Path
- An attacker compromises the upstream package publisher, distribution account, release pipeline, package index, or one of the transitive dependencies.
- The attacker publishes a malicious release that still satisfies the unconstrained package name
fastmcp. - A user follows the documented command:
bash pip install fastmcp - `p ...[truncated 1144 chars]
- Remediation
View remediation
Remediation Suggestions
-
Pin
fastmcpto a specifically reviewed version rather than resolving the latest release:text fastmcp==REVIEWED_VERSION -
Generate and distribute a lockfile containing exact versions and SHA-256 hashes for every direct and transitive dependency.
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Require hash verification during installation:
bash python -m pip install --require-hashes -r requirements.txt -
Review dependency source, maintainers, release history, and transitive dependency changes before updating the lockfile.
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Perform dependency updates intentionally through a controlled review process rather than permitting automatic resolution during user installation.
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Run installation and the MCP server as an unprivileged user in an isolated environment. Do not install or run the Skill with administrator or root privileges.
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Consider restricting outbound network access and limiting filesystem access for the MCP process so that a compromised dependency has a reduced impact.
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Update
SKILL.mdto replace the unconstrained installation command with the reproducible, hash-verified installation procedure.
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