fail2ban Reporter

• Outcome: Pass
• Latest audit: May 27, 2026, 9:22 PM
• Version:
  1.0.0

Overview

This skill does what it says: it reports fail2ban-banned IPs to AbuseIPDB, but installing auto-reporting gives it persistent privileged access to fail2ban configuration.

Install only on a server where you intentionally want fail2ban bans reported to AbuseIPDB under your API key. Review the scripts before running sudo install, confirm third-party sharing of banned IPs and comments is acceptable for your environment, and do not depend on Telegram alerts unless an implementation is added.

SkillSpector

By NVIDIA

Vulnerability Patterns

• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• MCP Least Privilege: Underdeclared Capability, Wildcard Permission, Missing Permission Declaration
• MCP Tool Poisoning: Hidden Instructions, Unicode Deception, Parameter Description Injection
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access

Findings (4)

Lp3

Medium

• Category: MCP Least Privilege
• Confidence: 94% confidence
• Finding: The skill advertises and invokes shell scripts but does not declare corresponding permissions, which prevents users and reviewers from understanding its execution capabilities upfront. In this context, the shell access is significant because the skill installs system-level fail2ban actions and runs local scripts that can alter host configuration and transmit data externally.

Tp4

High

• Category: MCP Tool Poisoning
• Confidence: 96% confidence
• Finding: The documented behavior does not fully match the skill's actual capabilities: it can perform additional IP lookups, show local/reporting stats, and install or remove fail2ban configuration, while also claiming Telegram notification support that appears absent. This mismatch is dangerous because users may authorize or run the skill under incomplete assumptions, leading to unexpected system changes, data sharing, or false reliance on missing alerting functionality.

Missing User Warnings

Medium

• Confidence: 90% confidence
• Finding: The README promotes automatic reporting of banned IPs to AbuseIPDB but does not clearly warn users that IP addresses, timestamps, and attack metadata will be sent to a third party. In a security-monitoring skill, this kind of external data sharing is central to the feature, so the missing disclosure is a real privacy and compliance risk rather than a purely theoretical concern.

Missing User Warnings

Medium

• Confidence: 93% confidence
• Finding: The skill omits a prominent warning that it sends banned IP information to AbuseIPDB and modifies fail2ban for automatic reporting. Even if the functionality is aligned with the skill's purpose, users need explicit notice and consent because the behavior affects system security configuration and shares operational security data with a third party.

VirusTotal

66/66 vendors flagged this skill as clean.