T03 · Remote Payload Retrieval and Execution
Error
- Location
setup.sh:40- Finding
Remote Installer Is Downloaded and Executed Without Verification
- Content
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/dev/null; then if command -v curl &> /dev/null; then curl -LsSf https://astral.sh/uv/install.sh | sh elif command -v wget &> /dev/null; then wget -qO- https://astral.sh/uv/install.sh | sh else echo "ERROR: curl or wget is required to install uv." exit 1 fi export PATH="$HOME/.local/bin:$PATH" fi ``` ### Technical Analysis The setup process streams a remote HTTP response directly into `sh`. The downloaded installer is not pinned to a specific release and is not validated using a cryptographic checksum or signature before execution. Although `astral.sh` is the documented installation source for uv, this pattern creates a mutable code-execution channel. The effective installer can change after the Skill has been reviewed. A compromise of the remote distribution service, its deployment process, DNS resolution, or the applicable TLS trust chain could cause arbitrary shell commands to run under the account invoking `setup.sh`. The use of HTTPS protects transport under normal conditions but does not provide artifact-level integrity or ensure that the audited payload is the payload executed later. ### Attack Path 1. Python 3.10 and uv are absent on the target system. 2. The user or agent runs `bash setup.sh`. 3. An attacker compromises or substitutes the response from `https://astral.sh/uv/install.sh`. 4. `curl` or `wget` streams the attacker-controlled response directly to `sh`. 5. The payload executes with all privileges available to the invoking user. 6. The payload can read user-accessible files, alter shell configuration, install persistent user-level components, or replace project artifacts. ### Impact Assessment Successful exploitation provides arbitrary command execution as the user running the ...[truncated 358 chars]- Remediation
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