T03 · Remote Payload Retrieval and Execution
- Location
README.md:30- Finding
Unverified Remote Installer Is Downloaded and Executed Directly
- Content
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Vulnerability Details
File Location:
README.md:30andSKILL.md:56
Vulnerability Type: Remote payload retrieval and execution
Risk Level: HighVulnerable Code
README.md:30:bash curl -sL https://aka.ms/InstallAzureCliLinux | bashSKILL.md:56:bash curl -sL https://aka.ms/InstallAzureCliLinux | bashTechnical Analysis
These installation instructions follow a mutable URL redirect and pass the returned content directly to Bash. The payload is not pinned to a version or cryptographic digest, and the user has no opportunity to authenticate or inspect the final script before execution.
The URL uses Microsoft's
aka.msredirect service, which reduces but does not eliminate the security risk. The effective payload can change after this Skill has been reviewed. Compromise of the redirect, destination host, TLS trust chain, upstream publishing process, or installer could therefore turn these instructions into an arbitrary-code execution channel.Installing Azure CLI is necessary for the declared Azure-management functionality. However, executing a remote response directly through a shell is not the minimum-risk or minimum-privilege installation method. Repository-based package installation with signature verification can provide the same functionality with stronger supply-chain controls.
Attack Path
- A user or agent follows the Linux installation instructions.
curlfollows the mutableaka.msredirect and downloads the current remote response.- The response is streamed directly into Bash without validation or inspection.
- If the upstream content or delivery path has been compromised, attacker-controlled shell commands execute locally.
- The payload obtains the privileges of the invoking user and may receive elevated privileges if the installer invokes
sudoor the user runs the command as root.
Impact Assessment
Successful exploitation permits arbi ...[truncated 390 chars]
- Remediation
View remediation
Remediation Suggestions
- Remove the direct
curl | bashinstruction from bothREADME.mdandSKILL.md. - Prefer Microsoft's documented package-repository installation process, including repository-signing-key and package-signature verification.
- Pin a tested Azure CLI version where operationally practical.
- If a remote installer must be used:
- Download it to a local file.
- Verify its final origin and expected cryptographic digest or signature.
- Review the downloaded content.
- Execute it only after verification.
- Do not run the installation as root unless a specific package-management step requires elevation.
- Document the exact commands requiring elevation rather than granting an entire remote script elevated execution.
- Remove the direct
