T08 · Insecure Dependencies
Warning
- Location
- SKILL.md:14
- Finding
- Unpinned Global Installation and Execution of an npm Dependency## Vulnerability Details **File Location**: `SKILL.md`, lines 14-19 **Vulnerability Type**: Supply-chain exposure through an unpinned third-party package **Risk Level**: Medium ### Vulnerable Code ```bash # Install xurl npm i -g xurl # Authenticate xurl auth ``` ### Technical Analysis The Skill instructs users to globally install the latest available version of the `xurl` npm package and then execute it in an authentication context. No package version, integrity hash, lockfile, verified publisher, or trusted registry source is specified. Consequently, the package content installed when the instructions are followed may differ from the content reviewed when the Skill was published. npm installation can also run package lifecycle scripts. A compromised package release, package ownership transfer, registry account compromise, or malicious package substitution could therefore result in arbitrary code execution with the permissions of the user running npm. The subsequent `xurl auth` operation increases the sensitivity of this dependency because the installed tool may receive or access X authentication tokens and account authorization data. ### Attack Path 1. An attacker compromises the referenced npm package, its publisher account, or its distribution channel. 2. The attacker publishes a malicious release under the package name used by the Skill. 3. A user follows the documented `npm i -g xurl` instruction without a version constraint. 4. npm downloads and installs the attacker-controlled release and may execute its lifecycle scripts. 5. The user executes `xurl auth`, exposing authentication data or account access to the compromised program. 6. The malicious package can steal credentials, modify files, or execute other commands within the installing user's security context. ### Impact Assessment Successful exploitation could provide arbitrary code execution with the privileges of the user performing the install ...[truncated 441 chars]
- Remediation
- ## Remediation Suggestions 1. Pin the dependency to a specifically reviewed version rather than installing the latest release: ```bash npm install --global xurl@REVIEWED_VERSION ``` 2. Document the expected npm registry, package publisher, repository, and package integrity information. 3. Verify the downloaded package against an approved checksum or npm integrity value before execution. 4. Prefer a project-local dependency governed by a committed lockfile over a global installation. 5. Review package lifecycle scripts and consider installing with scripts disabled where compatible: ```bash npm install --ignore-scripts --save-exact xurl@REVIEWED_VERSION ``` 6. Perform authentication using a least-privilege account and the minimum required OAuth scopes. 7. Do not run the installation with administrator or root privileges. 8. Establish a process for reviewing dependency updates before changing the pinned version.