T08 · Insecure Dependencies
Error
- Location
- slack_fetch_and_print.sh:15
- Finding
- Execution of Unverified Dependencies Outside the Skill Package<![CDATA[ ## Vulnerability Details **File Location**: `slack_fetch_and_print.sh`, lines 15–36 **Vulnerability Type**: Unverified external shell and Python dependencies **Risk Level**: High ### Vulnerable Code ```bash SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" DOWNLOADER="$SCRIPT_DIR/../shared/slack_downloader.py" INBOUND_DIR="${INBOUND_DIR:-$HOME/.openclaw/media/inbound}" PRINTER="${PRINTER:-}" mkdir -p "$INBOUND_DIR" if [ -z "$PRINTER" ]; then echo "Error: set the PRINTER environment variable to specify a printer, e.g.: PRINTER=MyPrinter ./slack_fetch_and_print.sh" echo "Available printers: $(lpstat -a 2>/dev/null | awk '{print $1}' | tr '\n' ' ')" exit 1 fi source "$SCRIPT_DIR/../shared/slack_args.sh" # Download files and collect successful paths DOWNLOADED=() while IFS= read -r line; do echo "$line" if [[ "$line" == SUCCESS:* ]]; then filepath="${line#SUCCESS: }" DOWNLOADED+=("$filepath") fi done < <(python3 "$DOWNLOADER" "${SLACK_ARGS[@]}" "$INBOUND_DIR") ``` ### Technical Analysis The script executes two dependencies located outside the audited Skill package: - `../shared/slack_args.sh` is loaded with `source`, which executes all of its commands in the current shell process. - `../shared/slack_downloader.py` is executed using Python with the invoking user's privileges. Neither dependency is bundled with the audited project, pinned to a known version, validated against a cryptographic digest, or checked for ownership and permissions before execution. The audit therefore cannot verify their network destinations, credential handling, file-selection logic, or other side effects. Using `source` creates a particularly broad trust boundary because the external shell file can modify variables and functions, alter shell behavior, replace commands, read accessible secrets, or directly execute arbitrary commands. The Python dependency can likewise perform any operation available to the invoking user ...[truncated 1958 chars]
- Remediation
- <![CDATA[ ## Remediation Suggestions 1. Bundle the required downloader and argument-processing implementation inside the reviewed Skill package. 2. Resolve dependency paths beneath the Skill directory and reject paths that escape that directory after canonicalization. 3. Pin dependency versions and validate them using cryptographic hashes or signed release metadata before execution. 4. Verify that dependency files are regular files owned by an expected trusted account and are not writable by untrusted users. 5. Avoid `source` for argument construction. Use a non-executable configuration format or invoke a constrained helper that returns validated structured data. 6. Validate every generated Slack argument against an explicit allowlist before passing it to the downloader. 7. Run network-facing download logic with reduced privileges and restrict outbound access to documented Slack endpoints. 8. Store downloaded files in a private directory with restrictive permissions, validate their type and size, and ensure returned paths remain within that directory before sending them to `lp`. 9. Document the required Slack permissions and use a minimally scoped token that can only read the intended channel and files. ]]>