DNS & Networking

• Outcome: Review
• Latest audit: Jul 10, 2026 · 4:04 AM UTC
• Version: 1.0.0

Overview

This is a coherent networking troubleshooting skill, but it includes ready-to-run privileged firewall and proxy configuration changes that deserve user review before installation.

Install only if you want an agent to have networking troubleshooting reference commands, and review before allowing it to run privileged or persistent examples. In particular, do not automatically run firewall allow/deny/reset, iptables-save, global proxy configuration, /etc/hosts changes, certificate-bypass commands, or inline proxy credential examples on production or remote systems without explicit approval and a rollback plan.

SkillSpector

By NVIDIA

Vulnerability Patterns

• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access
• MCP Tool Poisoning: Hidden Instructions, Unicode Deception, Parameter Description Injection
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code

Findings (14)

Description-Behavior Mismatch

Medium

• Confidence: 94% confidence
• Finding: The skill is presented as a diagnostics aid, but this section includes system reconfiguration actions such as changing firewall policy, enabling/disabling firewall behavior, and setting proxy/tool configuration. That scope expansion is risky because an agent or user may treat the skill as read-only troubleshooting guidance while actually applying persistent network-access changes that can expose services or break connectivity.

Description-Behavior Mismatch

Low

• Confidence: 84% confidence
• Finding: The documented behavior goes beyond simple inspection of DNS state and includes privileged cache-flushing operations that modify system behavior. While common in troubleshooting, these actions are not clearly distinguished from safe read-only checks, which increases the chance of unintended system changes.

Missing User Warnings

Medium

• Confidence: 96% confidence
• Finding: The firewall examples include commands to allow, deny, enable, and reset rules without warnings about lockout, service interruption, or persistence effects. In a troubleshooting context, copying these commands blindly can accidentally expose services or sever remote administrative access.

Missing User Warnings

Medium

• Confidence: 97% confidence
• Finding: The proxy examples place credentials directly in environment variables, which can leak through shell history, process listings, logs, CI output, or inherited environments. This creates unnecessary credential exposure risk, especially on shared systems or automated runners.

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

# Flush DNS cache
# macOS:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
# Linux (systemd-resolved):
sudo systemd-resolve --flush-caches
# Windows:

• Confidence: 78% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

# Flush DNS cache
# macOS:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
# Linux (systemd-resolved):
sudo systemd-resolve --flush-caches
# Windows:

• Confidence: 78% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

# macOS:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
# Linux (systemd-resolved):
sudo systemd-resolve --flush-caches
# Windows:
ipconfig /flushdns

• Confidence: 77% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT

# Allow incoming from specific IP
sudo iptables -A INPUT -s 203.0.113.0/24 -p tcp --dport 22 -j ACCEPT

# Block incoming on a port
sudo iptables -A INPUT -p tcp --dport 3306 -j DROP

• Confidence: 95% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

sudo iptables -A INPUT -s 203.0.113.0/24 -p tcp --dport 22 -j ACCEPT

# Block incoming on a port
sudo iptables -A INPUT -p tcp --dport 3306 -j DROP

# Save rules (persist across reboot)
sudo iptables-save > /etc/iptables/rules.v4

• Confidence: 95% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

sudo ufw enable

# Allow/deny
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw allow from 203.0.113.0/24 to any port 22
sudo ufw deny 3306

• Confidence: 94% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

# Allow/deny
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw allow from 203.0.113.0/24 to any port 22
sudo ufw deny 3306

• Confidence: 94% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

# Allow/deny
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw allow from 203.0.113.0/24 to any port 22
sudo ufw deny 3306

# Check status

• Confidence: 94% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw allow from 203.0.113.0/24 to any port 22
sudo ufw deny 3306

# Check status
sudo ufw status verbose

• Confidence: 92% confidence
• Finding: sudo

Sudo/Root Execution

Medium

• Category: Privilege Escalation

Content

sudo ufw deny 3306

# Check status
sudo ufw status verbose

# Reset all rules
sudo ufw reset

• Confidence: 97% confidence
• Finding: sudo

VirusTotal

32/32 vendors flagged this skill as clean.

Static analysis

No suspicious patterns detected.