T03 · Remote Payload Retrieval and Execution
Error
- Location
SKILL.md:80- Finding
Unverified Remote Script Is Piped Directly into Bash
- Content
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Run `aliyun version` to verify >= 3.3.3. If not installed or version too low, > run `curl -fsSL https://aliyuncli.alicdn.com/setup.sh | bash` to update, > or see [references/cli-installation-guide.md](references/cli-installation-guide.md) for installation instructions. ``` ### Technical Analysis The instruction streams a mutable response from an external URL directly into Bash. Although HTTPS authenticates the remote endpoint under normal conditions, the workflow does not pin the script version, validate a cryptographic signature or checksum, preserve the script for inspection, or obtain explicit approval before execution. The effective code can consequently change after the Skill has been reviewed. Compromise of the publishing account, CDN, origin server, DNS or TLS infrastructure could turn this installation step into arbitrary command execution. Executing a remote installer is not required for the Skill's core Elasticsearch management functionality. The Skill can instead require a previously installed CLI or direct the user to a verified package-management process. ### Attack Path 1. An attacker compromises the script publication pipeline, origin server, CDN, or another trusted delivery component. 2. The attacker replaces `setup.sh` with a malicious script. 3. The Skill detects that Aliyun CLI is missing or outdated. 4. The documented `curl` command retrieves the attacker's current response. 5. Bash immediately executes the response without integrity verification or review. 6. The payload accesses local files, environment variables, Aliyun CLI profiles, or other resources available to the Agent's operating-system account. ### Impact Assessment Successful exploitation provides arbitrary code execution with the privileges of the user running the Agent. The pa ...[truncated 290 chars]- Remediation
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