We release patches for security vulnerabilities. Currently supported versions:

The Complete Linux Internet Repair Tool performs network configuration changes that require root/sudo access. This is by design and necessary for:

• Modifying /etc/resolv.conf and other network configuration files
• Bringing network interfaces up/down
• Modifying routing tables
• Restarting system services (NetworkManager, systemd-resolved, etc.)
• Running privileged network commands (ip, iptables, etc.)

1. Privilege Checking

   • Explicit privilege checks before operations
   • Clear user notification when sudo is required
   • Sudo keep-alive only for duration of operations
   • No unnecessary privilege escalation

2. Input Sanitization

   • All user inputs are sanitized to prevent command injection
   • Interface names validated against system interfaces
   • File paths validated before access
   • No arbitrary command execution from user input

3. File Safety

   • Automatic backups before modifying configuration files
   • Backups stored in user's home directory (~/.network-repair-backups/)
   • File permission preservation
   • Atomic file operations where possible

4. Code Safety

   • Bash strict mode (set -euo pipefail) where appropriate
   • Proper error handling and validation
   • No use of eval or dangerous constructs
   • Shell script best practices followed

5. Transparency

   • Detailed logging of all operations
   • Dry-run mode to preview changes
   • Verbose mode for debugging
   • Clear error messages

We take security seriously. If you discover a security vulnerability, please follow responsible disclosure practices:

DO NOT open a public GitHub issue for security vulnerabilities.

Instead, please report security issues via:

1. Email: security@[project-domain] (if project domain exists)
2. Private vulnerability report: Use GitHub's private vulnerability reporting feature (if enabled)
3. Encrypted email: PGP key available in .well-known/security.txt

Please include:

• Description: Clear description of the vulnerability
• Impact: Potential impact and attack scenarios
• Reproduction: Step-by-step instructions to reproduce
• Affected versions: Which versions are affected
• Suggested fix: If you have one (optional but helpful)
• Your details: How you'd like to be credited (optional)

Subject: [SECURITY] Command Injection in Interface Name Handling

Description:
The interface name parameter in repair_interfaces() does not properly
sanitize input, allowing command injection via crafted interface names.

Impact:
An attacker with local access could execute arbitrary commands with
root privileges by providing a malicious interface name.

Reproduction:
1. Run: sudo ./network-repair repair-network "eth0; rm -rf /"
2. Observe arbitrary command execution

Affected Versions: 1.0.0 and earlier

Suggested Fix:
Add proper input validation in src/utils/system.sh:sanitize_input()
to only allow alphanumeric characters, dash, and underscore.

• Acknowledgment: Within 48 hours
• Initial assessment: Within 5 business days
• Status updates: Every 7 days until resolution
• Fix timeline: Critical issues within 7 days, others within 30 days
• Public disclosure: After fix is released and deployed

1. Report received → We acknowledge receipt within 48 hours
2. Assessment → We verify and assess severity (using CVSS v3.1)
3. Development → We develop and test a fix
4. Private notification → We notify affected users privately
5. Public release → We release patched version
6. CVE assignment → We request CVE if applicable
7. Public disclosure → We publish security advisory (coordinated with reporter)
8. Credit → We credit reporter in CHANGELOG and security advisory

We use CVSS v3.1 for severity assessment:

• Critical (9.0-10.0): Fix within 24-48 hours
• High (7.0-8.9): Fix within 7 days
• Medium (4.0-6.9): Fix within 30 days
• Low (0.1-3.9): Fix in next regular release

1. Verify integrity:

   # Check SHA256 checksums if provided
   sha256sum -c checksums.txt

2. Review code:

   # All code is open source - review before running with root
   less src/main.sh

3. Use dry-run mode first:

   # Preview changes without making them
   sudo ./network-repair --dry-run repair

1. Understand what it does:

   • Read the documentation
   • Use verbose mode to see what's happening
   • Check backups before and after

2. Limit exposure:

   • Don't run on production systems without testing first
   • Use virtual machines for testing
   • Have a recovery plan

3. Monitor changes:

   # Check what was backed up
   ls -la ~/.network-repair-backups/
   
   # View logs
   tail -f /var/log/network-repair.log  # if LOG_TO_FILE=true

1. Verify system state:

   # Check network is working
   ping -c 3 google.com
   
   # Verify DNS
   dig google.com
   
   # Check interfaces
   ip addr show

2. Review changes:

   # Compare before/after
   diff ~/.network-repair-backups/resolv.conf.20250122_143052 /etc/resolv.conf

These are intentional design decisions, not vulnerabilities:

1. Requires Root: Many network operations require root privileges. This is necessary and expected.

2. Modifies System Files: The tool modifies /etc/resolv.conf, routing tables, etc. This is its purpose.

3. Restarts Services: May restart NetworkManager, systemd-resolved, etc. Required for repairs to take effect.

4. No Authentication: Local tool assumes user has physical/SSH access. Not designed for remote/untrusted use.

The following are out of scope for security reports:

• Theoretical attacks requiring physical access to an already-compromised system
• Social engineering attacks
• Attacks requiring user to intentionally run malicious code
• Issues in third-party tools we depend on (report to those projects)
• Denial of service via resource exhaustion (local tool, single-user)

• Initial release with security-focused design
• Input sanitization for all user-provided values
• Automatic backups before file modifications
• Privilege checking and safe elevation
• No use of dangerous bash constructs (eval, etc.)
• Dry-run mode for safe preview

We welcome security-focused static analysis:

# ShellCheck (for bash)
shellcheck src/**/*.sh

# Syntax validation
find . -name "*.sh" -exec bash -n {} \;

If you want to fuzz-test the tool:

# Example: Test with random interface names
for i in {1..1000}; do
    random_input=$(head -c 20 /dev/urandom | base64 | tr -d '+/=')
    echo "Testing: $random_input"
    ./network-repair diagnose-network "$random_input" 2>&1 | grep -i "error\|crash\|segfault" || true
done

• Security Email: security@[project-domain]
• Security.txt: .well-known/security.txt (RFC 9116)
• PGP Key: See .well-known/security.txt for current key

We maintain a security hall of fame to thank researchers who help improve security:

No vulnerabilities reported yet. Be the first!

This security policy is licensed under CC0 1.0 Universal (Public Domain).

Last Updated: 2025-01-22 Version: 1.0.0