T03 · Remote Payload Retrieval and Execution
- Location
README.md:28- Finding
Remote Installer Is Downloaded and Executed Without Integrity Verification
- Content
View full analysis
Vulnerability Details
File Location:
README.md:28
Vulnerability Type: Remote payload retrieval and execution
Risk Level: HighVulnerable Code:
bash curl -LsSf https://astral.sh/uv/install.sh | shTechnical Analysis
The installation instructions pipe network-delivered content directly into a shell. The script is not pinned to an immutable version and is not checked against a cryptographic hash or signature before execution.
Although
astral.shis the documented uv domain, the effective payload can change after this project has been reviewed. Compromise of the hosting service, DNS or TLS trust chain, or upstream installation script could therefore turn this instruction into arbitrary shell-code execution.Executing a remote installer is relevant to project setup, but direct execution exceeds the minimum privilege and trust necessary to install the package manager safely.
Attack Path
- An attacker compromises the remote installer, its hosting infrastructure, or another part of the delivery chain.
- A user follows the documented quick-start instructions.
curlretrieves the attacker-controlled response.- The response is passed immediately to
sh, without an opportunity for inspection or integrity verification. - The payload executes with all permissions of the user running the command.
Impact Assessment
Successful exploitation provides arbitrary command execution under the invoking user's account. The payload could read or modify user-accessible files, steal credentials available to that account, alter the project or development environment, install persistence where user permissions permit, or invoke privileged commands if the user runs the instruction with elevated rights.
- Remediation
View remediation
Remediation Suggestions
- Replace the
curl | shinstruction with installation from a pinned release artifact. - Download the artifact to a local file before executing or installing it.
- Verify a publisher-provided cryptographic signature or a checksum recorded through a trusted channel.
- Pin the documented uv version rather than implicitly accepting the latest installer behavior.
- Instruct users to inspect the downloaded installer before execution.
- Avoid recommending elevated privileges unless they are demonstrably required.
- Replace the
