T03 · Remote Payload Retrieval and Execution
Error
- Location
scripts/outlook-setup.sh:29- Finding
Privileged Execution of an Unverified Remote Installation Script
- Content
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/dev/null; then echo -e "${RED}Error: Azure CLI not installed${NC}" echo "Install with: curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash" exit 1 fi ``` ### Technical Analysis The setup script instructs the user or calling Agent to retrieve a script from a mutable URL and pipe it directly into a root shell: ```bash curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash ``` This pattern combines remote retrieval and privileged execution without: - Pinning the retrieved content to a specific version. - Validating a cryptographic checksum. - Verifying a detached signature. - Allowing the user to inspect the downloaded payload before execution. - Separating download and privileged installation operations. The URL is hosted under a Microsoft-controlled domain, which reduces but does not eliminate the supply-chain risk. The effective code executed by this command can change after the Skill has been reviewed. The Skill does not execute this command automatically, but displaying it as the prescribed installation procedure can cause a user or Agent to execute it. ### Attack Path 1. The user runs `scripts/outlook-setup.sh` on a system without Azure CLI. 2. The script displays the network-to-shell installation command. 3. The user or an automated Agent executes the displayed command. 4. `curl` follows redirects and retrieves the current response from the remote endpoint. 5. The response is passed directly to `sudo bash`. 6. If the endpoint, redirect chain, delivery infrastructure, or retrieved content is compromised or unexpectedly modified, arbitrary commands execute with root privileges. ### Impact Assessment Successful exploitation provides arbitrary root-level code execution. A malicious remote payload could: - Rea ...[truncated 442 chars]- Remediation
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