T03 · Remote Payload Retrieval and Execution
- Location
SKILL.md:46- Finding
Unverified Remote Script Downloaded and Executed Through Bash
- Content
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= 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 command pipes a mutable response from an external URL directly into Bash. There is no opportunity to inspect the script, no pinned version, and no checksum or cryptographic signature verification. Although the hostname appears related to Alibaba Cloud, the project does not establish the integrity of the retrieved response. Compromise of the CDN, origin server, DNS resolution, TLS trust chain, or future upstream script content would allow the effective payload to change after this Skill has been audited. This behavior is unnecessary for the Skill's declared read-only firewall overview functionality. Installing software should be a separate, explicitly approved prerequisite rather than an automatic Skill action. ### Attack Path 1. The Skill is invoked on a system without the required CLI version. 2. The Agent follows the installation instruction. 3. `curl` retrieves the current response from the external endpoint. 4. The response is streamed directly into Bash without validation. 5. Any commands in the response execute with the privileges of the Agent's operating-system account. 6. The downloaded script can access local files and credentials, modify tools, install persistence, or issue authenticated cloud commands. ### Impact Assessment Successful exploitation provides arbitrary command execution under the local account running the Agent. The resulting scope can include: - Reading Aliyun CLI configuration and cloud credentials avail ...[truncated 418 chars]- Remediation
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