Lesson 13

Date: 6/27/2018
Linux Network Security
Linux System Administration


Package upgrades and md5 checksum verification

  • On Ubuntu, run upgrades on regular bases and every time a new vulnerability discovered in installed packages: 
    
apt-get update
apt-get upgrade

  • On CentOS, use YUM for updates: 
    
yum update

  • Verify md5 checksum of downloaded software: 
    
md5sum some_file.tgz

  • On Ubuntu, install dlocate and verify md5 checksum of the files installed with a package: 
    
apt-get install dlocate
dlocate -md5sum tcpd
dlocate -md5check tcpd

  • On CentOS, use rpm -V command to verify package integrity: 
    
rpm -V tcp_wrappers

  • Install GNU Privacy Guard (GPG) to check software signature and verifying if files are genuine: 
    
gpg --verify ssh-3.2.9.1.tar.gz.sig-gpg ssh-3.2.9.1.tar.gz


    • Take me to the Course Website