T03 · Remote Payload Retrieval and Execution
Error
- Location
- scripts/outlook-setup.sh:37
- Finding
- Suggested execution of an unpinned remote installer with root privileges<![CDATA[ ## Vulnerability Details **File Location**: `scripts/outlook-setup.sh`, lines 37-40 **Vulnerability Type**: Remote payload retrieval and privileged execution **Risk Level**: High ### Vulnerable Code ```bash if ! command -v az &> /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 When Azure CLI is unavailable, the setup script instructs the user to pipe a remotely retrieved shell script directly into `sudo bash`. The command is printed rather than automatically executed, but it is presented as the prescribed installation procedure during a trusted setup workflow. The effective payload is retrieved from a mutable URL at execution time. It is not pinned to a specific version, downloaded for inspection, or verified using a cryptographic checksum or package signature before receiving root privileges. The use of a Microsoft-controlled HTTPS domain reduces—but does not eliminate—the supply-chain risk. This behavior is not the minimum privilege necessary for the Skill. Azure CLI is a legitimate dependency, but installing it through an unverified network-to-root shell pipeline is not required for Outlook mail or calendar functionality. ### Attack Path 1. A user runs `scripts/outlook-setup.sh` on a system without Azure CLI. 2. The script displays `curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash` as the installation command. 3. The user executes that command while relying on the Skill's setup instructions. 4. `curl` follows the redirect and retrieves the current remote installer. 5. The installer is passed directly to a root shell without local inspection or integrity verification. 6. If the remote script, redirect destination, hosting infrastructure, or trusted delivery chain is compromised, attacker-controlled commands execute as root. ### Impact Assessment Successful exploitation provides arbitrary com ...[truncated 432 chars]
- Remediation
- <![CDATA[ ## Remediation Suggestions 1. Remove the `curl | sudo bash` recommendation from the setup script. 2. Direct users to official, platform-specific Azure CLI installation documentation. 3. Prefer installation through an operating-system package manager configured with Microsoft's signed repository. 4. If an installer must be downloaded: - Pin a specific release and immutable download URL. - Save the file before execution. - Verify its publisher signature or a checksum obtained through an independent trusted channel. - Display the verified script for review. - Avoid root execution unless installation genuinely requires it. 5. Clearly separate dependency installation from the Skill's normal execution and explain why elevated privileges are requested. ]]>