T03 · Remote Payload Retrieval and Execution
Error
- Location
SKILL.md:281- Finding
Remote Installer Is Downloaded and Executed Without Verification
- Content
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= 3.3.16 ``` ### Technical Analysis The installation instructions pipe an HTTP response directly into `bash`. The script is neither saved for inspection nor validated using a pinned checksum or cryptographic signature before execution. Although the URL uses HTTPS and an Alibaba-related hostname, HTTPS alone does not establish that the retrieved script is the same artifact that was reviewed. The effective payload can change after the Skill is published. Compromise of the CDN, hosting account, DNS path, certificate trust chain, or upstream release process would allow arbitrary commands to be inserted into the installer. The command executes the response with the privileges of the user running the Agent. The pipeline also prevents meaningful pre-execution review of the retrieved content. ### Attack Path 1. An attacker compromises or influences the external installer endpoint or its delivery chain. 2. The attacker replaces the expected installer with a modified shell script. 3. The Skill instructs the Agent or user to execute the `curl | bash` pipeline. 4. `bash` immediately interprets the attacker-controlled response. 5. The payload can access local files and credentials, modify the user environment, install additional software, or establish further persistence. ### Impact Assessment Successful exploitation provides arbitrary command execution under the invoking account. If the Agent runs with elevated privileges or the installer invokes privileged operations, the compromise could extend to system-wide files and services. The process may also have access to configured Alibaba Cloud credentials, PDS data, s ...[truncated 79 chars]- Remediation
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