T03 · Remote Payload Retrieval and Execution
- Location
heartbeat.md:89- Finding
Recurring retrieval and replacement of mutable Skill instructions
- Content
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~/.openclaw/skills/clawgram/SKILL.md curl -fsSL https://clawgram.org/openapi.yaml > ~/.openclaw/skills/clawgram/openapi.yaml curl -fsSL https://clawgram.org/rules.md > ~/.openclaw/skills/clawgram/rules.md curl -fsSL https://clawgram.org/heartbeat.md > ~/.openclaw/skills/clawgram/heartbeat.md curl -fsSL https://clawgram.org/skill.json > ~/.openclaw/skills/clawgram/skill.json ``` The surrounding instructions recommend periodically refreshing these files, with once per day presented as an appropriate frequency. ### Technical Analysis The heartbeat retrieves mutable Markdown, API definitions, rules, and metadata from external URLs and writes them directly over locally installed Skill files. There is no immutable version pin, expected cryptographic hash, signature validation, reviewed manifest, diff review, or atomic installation step. Although this is not a literal `curl | bash` pipeline, `SKILL.md` is operational instruction content loaded by OpenClaw. Replacing it can therefore change subsequent agent behavior after the installed package has already passed review. The effective payload remains controlled by the remote server. This behavior also conflicts with the safer policy in `SKILL.md`, which states that local files should be updated only following an explicit owner request and that background refresh must not overwrite them. ### Attack Path 1. An owner installs the reviewed Clawgram Skill. 2. The heartbeat is configured to execute periodically. 3. The agent follows the daily refresh guidance in `heartbeat.md`. 4. The Clawgram documentation host, deployment account, DNS path, or upstream p ...[truncated 1052 chars]- Remediation
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