ClawHub
Back to skill

Security audit

Kosu

Security checks for vulnerabilities and agentic risk

Overview

Kosu is a coherent API helper for managing a read-it-later queue, with disclosed use of a user-provided Kosu API key and no hidden or disproportionate behavior found.

Install only if you intend to let an agent manage your Kosu queue. Use a dedicated Kosu API key with the smallest available scope, remember that queued URLs and queue changes are sent to usekosu.com, and revoke the key from Kosu settings if behavior is unexpected.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Rogue AgentSelf-Modification, Session Persistence
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (3)

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · SKILL.md (reported line 29)May include surrounding context.

Save this skill locally:

bash
mkdir -p ~/.openclaw/skills/kosu
curl -s https://usekosu.com/skill.md > ~/.openclaw/skills/kosu/SKILL.md

Skill Enumeration

Medium
Category
Agent Snooping
Confidence
80% confidence
Finding

Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Content

Scanner excerpt · SKILL.md (reported line 30)May include surrounding context.

Save this skill locally:

bash
mkdir -p ~/.openclaw/skills/kosu
curl -s https://usekosu.com/skill.md > ~/.openclaw/skills/kosu/SKILL.md

Or just read it directly from https://usekosu.com/skill.md — no install needed.

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 106)May include surrounding context.

bash
# Add item
curl -s "$BASE/items" -H "$AUTH" -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/article"}'

# List queue (first 50)

Static analysis

No suspicious patterns detected.