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Security audit

Slack Bot

Security checks for vulnerabilities and agentic risk

Overview

The Slack workflow is clearly described, but setup instructs the agent to execute an unverified remote installer without a separate approval step.

Review the installation fallback before enabling this skill. Prefer installing a verified CLI yourself, or require explicit approval before downloaded setup code runs. OOMOL will mediate access to your connected Slack account, so limit its permissions and review posts and deletions. The remote installers and hosted connector implementation were not inspected; the supplied artifact does not establish malicious behavior.

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
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
98% confidence
Finding

The supplied code contains no Slack interaction. Its only demonstrated behavior is executing an external installer, with no evidence connecting that installation to the declared Slack functionality. The downloaded script is not supplied, so its further behavior cannot be assessed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a remotely fetched script directly into Bash executes its current contents without a pinned version or independent integrity verification; the PowerShell example has the same weakness. Compromise of the distribution endpoint could allow arbitrary code execution with the agent's local permissions, including access to available files and credentials. The legitimate connector dependency and conditional fallback reduce suspicion of malicious intent but do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 101)May include surrounding context.

Fallback setup executes remotely downloaded installation scripts without warning about local code execution and system changes.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The missing-command fallback instructs the agent to install software locally without explicitly requesting approval or explaining that downloaded code will execute with the agent's permissions. Confirmation requirements cover Slack mutations but do not cover this local system change; restricting installation to a missing-CLI error reduces frequency, not the authorization risk.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 122)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources