T03 · Remote Payload Retrieval and Execution
- Location
SKILL.md:48- Finding
Unverified Remote Installation Script Executed Directly by Bash
- Content
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**Pre-check: Aliyun CLI >= 3.3.3 required** > 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 install/update, > or see `references/cli-installation-guide.md` for installation instructions. ``` ### Technical Analysis The Skill instructs the Agent to retrieve a mutable shell script from an external URL and pass the response directly to Bash. The script is not included in the audited package, pinned to a specific version, verified against a cryptographic checksum, or authenticated using a package signature. Although the hostname appears related to the declared Alibaba Cloud service, transport-layer security alone does not establish the integrity of the script over time. Compromise of the CDN, hosting account, DNS resolution, certificate infrastructure, or upstream publishing process could alter the effective code executed after this Skill has been reviewed. The command also prevents meaningful inspection between download and execution. Any instructions returned by the remote endpoint run with the privileges of the Agent process. ### Attack Path 1. The Skill is activated on a system where Aliyun CLI is absent or older than version 3.3.3. 2. The mandatory prerequisite directs the Agent to run the installation command. 3. The Agent downloads the current contents of `setup.sh`. 4. The downloaded response is immediately interpreted by Bash. 5. If the remote delivery path has been compromised, the response can execute arbitrary commands. 6. The payload can inspect accessible files and environment variables, alter local tools or configuration, establish persistence, or use credentials available to the Agent. ### Impact Assessment Successful exploitation provides arbitrar ...[truncated 619 chars]- Remediation
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