T03 · Remote Payload Retrieval and Execution
Error
- Location
- SKILL.md:9
- Finding
- Unverified Remote Installer Is Piped Directly to Bash## Vulnerability Details **File Location**: `SKILL.md`, lines 9–13 **Vulnerability Type**: Remote payload retrieval and execution **Risk Level**: High **Vulnerable Code**: ```bash ## Install ```bash curl -fsSL https://dashboard.openblocklabs.com/install | bash ``` ``` ### Technical Analysis The installation command retrieves mutable content from an external URL and pipes it directly into Bash. The payload is neither version-pinned nor authenticated using a published cryptographic checksum or signature. It is also not saved locally for inspection before execution. HTTPS provides transport protection but does not prove that the current server-hosted installer is trustworthy or unchanged. The effective payload can change after this Skill has been reviewed. Compromise of the hosting domain, web application, deployment pipeline, or installer publication process could therefore turn the documented installation step into arbitrary code execution. Installing OB1 legitimately requires obtaining software, but directly executing mutable network content is not required. The remote script receives all permissions available to the user running the command, exceeding the minimum capability needed merely to download an installer. The installer content was not included in the audited project, so its actual operations and trustworthiness could not be verified. ### Attack Path 1. An attacker compromises the installer endpoint, its hosting infrastructure, or its publication pipeline. 2. The attacker replaces or modifies the response from `https://dashboard.openblocklabs.com/install`. 3. An agent or user follows the Skill’s installation instructions. 4. `curl` retrieves the attacker-controlled response. 5. The shell pipeline passes that response directly to Bash without verification or review. 6. Bash executes the payload with the invoking user’s privileges. 7. The payload can access or modify resources available to that user. ...[truncated 804 chars]
- Remediation
- ## Remediation Suggestions 1. Replace the mutable installer URL with a version-pinned release artifact from a verified official source. 2. Download the artifact to a local file rather than piping it directly into a shell. 3. Verify the downloaded artifact against a separately published cryptographic checksum and, preferably, a signature tied to a documented maintainer key. 4. Display or inspect the verified installer before execution and require explicit user approval. 5. Document every expected filesystem change, including installed binaries, symlinks, configuration files, and authentication storage. 6. Execute the installer without administrative privileges unless a specific, documented operation strictly requires elevation. 7. Prefer a reproducible package-manager installation or signed native package where available. 8. Pin both the installer and installed binary versions so subsequent audits evaluate the same code users execute. A safer conceptual workflow is: ```bash curl -fL -o ob1-installer.sh "https://verified.example/releases/VERSION/ob1-installer.sh" echo "EXPECTED_SHA256 ob1-installer.sh" | sha256sum -c - less ob1-installer.sh bash ob1-installer.sh ``` The URL, version, checksum, and signing process must come from verified OpenBlock Labs release documentation rather than the illustrative values above.