T03 · Remote Payload Retrieval and Execution
- Location
SETUP.md:62- Finding
Unverified Remote Installer Is Piped Directly into a Shell
- Content
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Vulnerability Details
File Location:
SETUP.md:62
Vulnerability Type: Remote payload retrieval and immediate execution
Risk Level: CriticalVulnerable Code:
bash curl -LsSf https://astral.sh/uv/install.sh | shTechnical Analysis
The setup instructions retrieve a mutable installation script from an external URL and pipe it directly into
sh. The command does not pin a release, verify a cryptographic checksum or signature, preserve the script for inspection, or otherwise ensure that the executed content matches the content reviewed during this audit.Although
astral.shis associated with the declareduvdependency, trust in the current domain does not eliminate the supply-chain risk. A compromised hosting account, upstream infrastructure, DNS or delivery path, or a future modification of the installer could cause arbitrary commands to execute. This behavior exceeds the minimum privilege necessary to install a dependency because a verified, version-pinned artifact could be used instead.Attack Path
- An attacker compromises the remote installer, its hosting infrastructure, or another component of its delivery chain.
- The user follows the documented setup command.
curldownloads the attacker-controlled response from the mutable URL.- The pipe passes the response directly to
shwithout verification or an opportunity for inspection. - The payload executes with all privileges available to the user running the setup command.
- The payload can access user-readable data, modify user-owned files, steal credentials, establish persistence, or retrieve additional payloads.
Impact Assessment
Successful exploitation provides arbitrary command execution under the installing user's account. The payload could read the Parallel AI API key and other user-accessible credentials, alter shell configuration, modify research documents, replace user-level executables, or create persist ...[truncated 202 chars]
- Remediation
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Remediation Suggestions
- Do not pipe network responses directly into a shell.
- Pin
uvto a reviewed release and obtain it through a trusted package manager or an official, versioned release artifact. - Download the artifact separately, using a command that fails on HTTP and transport errors.
- Verify a publisher signature or a cryptographic checksum obtained through an independently authenticated channel before execution.
- Preserve the downloaded file so the user can inspect it before running it.
- Execute installation with ordinary user privileges and avoid recommending elevated execution unless it is strictly necessary.
- Document the expected version, artifact URL, checksum, verification procedure, and installation destination.
