View source for Mitigation to secure files and file systems (en)

==General Mitigations:==

* '''Update the System Regularly:'''  
** Install system updates regularly to fix known security vulnerabilities. Use the command `sudo apt update && sudo apt upgrade`.
* '''Use a Firewall:'''  
** Configure a firewall (e.g., UFW or iptables) to block unnecessary traffic to your system. This will help prevent external attacks.
* '''Manage Users:'''  
** Create user accounts with minimal access rights. Avoid using the root account for daily tasks.
* '''Back Up Data:'''  
** Regularly back up your data to safeguard against damage or data loss.
* '''Install Antivirus:'''  
** Although Linux is relatively secure from viruses, installing antivirus software is still recommended, especially if you frequently download files from the internet.
* '''Monitor System Logs:'''  
** Check system logs regularly to detect suspicious activity.

==Mitigations for Files and File Systems:==

* '''Set Permissions:'''  
** Use the `chmod` and `chown` commands to properly set file and directory permissions. Ensure only authorized users have read, write, or execute access.
* '''Encryption:'''  
** Encrypt sensitive files using tools like `gpg` or `openssl`. This will protect your data if the files fall into the wrong hands.
* '''Use Secure File Systems:'''  
** Consider using file systems with additional security features, such as Btrfs or ZFS.
* '''Avoid Executing Untrusted Files:'''  
** Never execute files you do not trust or those from unverified sources.
* '''Check File Integrity:'''  
** Use checksums to verify file integrity. This will help you detect if files have been altered or corrupted.

==Mitigations for Specific Vulnerabilities:==

* '''OverlayFS Vulnerability:'''  
** Ensure you are using the latest Ubuntu kernel version that has patched this vulnerability (CVE-2023-2640 and CVE-2023-32629).
* '''Other Vulnerabilities:'''  
** Stay informed about the latest security updates for Ubuntu and other operating systems to learn about new vulnerabilities and how to address them.

==Firewall Configuration Example (UFW):==

 # Allow SSH connections
 sudo ufw allow ssh
 
 # Allow HTTP and HTTPS traffic
 sudo ufw allow http
 sudo ufw allow https
 
 # Deny all other incoming traffic
 sudo ufw deny
 
 # Enable the firewall
 sudo ufw enable

==Permission Setting Example:==

 # Create a directory with 755 permissions (rwxr-xr-x)
 sudo mkdir -m 755 my_secure_directory
 
 # Change file owner and group
 sudo chown user:group my_file

==Important:==
* Adapt the above mitigations to suit your needs and environment.
* Keep your knowledge about operating system security up to date.
* Follow the best security practices recommended by the Ubuntu community.

==Interesting Links==

* [[Forensic: IT]]
* '''Ubuntu Documentation:''' [https://help.ubuntu.com/](https://help.ubuntu.com/)
* '''DCloud:''' [https://dcloud.co.id/blog/cara-mitigasi-kerentanan-os-ubuntu.html](https://dcloud.co.id/blog/cara-mitigasi-kerentanan-os-ubuntu.html)