Critical OpenSSH Vulnerability (CVE-2024-6387): Please Update Your Linux


Critical OpenSSH Vulnerability (CVE-2024-6387): Please Update Your Linux

A critical security flaw (CVE-2024-6387) has been identified in OpenSSH, a program widely used for secure remote connections. This vulnerability could allow attackers to completely compromise affected systems (remote code execution).

Who is Affected?

Only specific versions of OpenSSH (8.5p1 to 9.7p1) running on glibc-based Linux systems are vulnerable. Newer versions are not affected.

What to Do?

  1. Update OpenSSH: Check your version by running ssh -V in your terminal. If you're using a vulnerable version (8.5p1 to 9.7p1), update immediately.

  2. Temporary Workaround (Use with Caution): Disabling the login grace timeout (setting LoginGraceTime=0 in sshd_config) can mitigate the risk, but be aware it increases susceptibility to denial-of-service attacks.

  3. Recommended Security Enhancement: Install fail2ban to prevent brute-force attacks. This tool automatically bans IPs with too many failed login attempts.

Optional: IP Whitelisting for Increased Security

Once you have fail2ban installed, consider allowing only specific IP addresses to access your server via SSH. This can be achieved using:

  • ufw for Ubuntu

  • firewalld for AlmaLinux or Rocky Linux

Additional Resources

About Fail2ban

Fail2ban monitors log files like /var/log/auth.log and bans IPs with excessive failed login attempts. It updates firewall rules to block connections from these IPs for a set duration. Fail2ban is pre-configured to work with common log files and can be easily customized for other logs and errors.

Installation Instructions:

  • Ubuntu: sudo apt install fail2ban

  • AlmaLinux/Rocky Linux: sudo dnf install fail2ban

About DevSec Hardening Framework

The DevSec Hardening Framework is a set of tools and resources that helps automate the process of securing your server infrastructure. It addresses the challenges of manually hardening servers, which can be complex, error-prone, and time-consuming, especially when managing a large number of servers. The framework integrates with popular infrastructure automation tools like Ansible, Chef, and Puppet. It provides pre-configured modules that automatically apply secure settings to your operating systems and services such as OpenSSH, Apache and MySQL. This eliminates the need for manual configuration and reduces the risk of errors.

Prepare by LinuxMalaysia with the help of Google Gemini

5 July 2024


In Google Doc Format 

Popular Posts


64bit Activity Adempire advocate Akta Apache ASAS Azam backup backuppc Bash Beowulf Big Data Broadband Budget Centos Cinta Cluster CMS cmsfornerd Company Complain computer Computer Operation Conference Contest Data Centre Operation DBmail Digg Digital Certification Discussion Group Django DNS Docker Domain Duit Online Economy Elastic Stack Elasticsearch ELK email email server English Evangelist Events Family Tree Fedora File System Firefox Foss FreeBSD FTX Gesaan Gluster Gmail Google Google App GTUG Hacking Hadoop hafnie Harisfazillah Jamel horde HP-UX hwclock IBM ICT Service Delivery and Operation Indonesia Internet Internet Tools Itanium Jabatan IT Negara Jaring Java Javascript Jepun Jiwang Joke Joomla K3S K3Sup Kernel Kesihatan Kibana KOSTEM Kubernetes ldap Linux Linux Counter linuxmalaysia Logstash Love Mailman MailScanner Mailwatch Malay Malaysia MAMPU MDeC meetup Melaka Melayu Merdeka Microsoft Migration mirror sites Money Online Monitor MOSC 2010 MOSC2010 mosc2011 MOSC2013 MOSCMY MOSCMY2014 MOSCMY2015 Mozilla MPI MSC Malaysia MSC Malaysia OSCONF MSCOSCONF My Love MyGOSSCON MyMeeting Mypenguin99 mysql Nagios NagiosQL Negaraku Nginx nss_ldap ntp OBW2014 Open Office Open Source openldap OpenSSH OpenStack Opera OS2 OS400 OSCC OSCC MAMPU OSS OSS Policy OWASP Parallel Computing People Power Personal Petition PGP PHP Pligg Podman Politik Postfix Postgresql Programming Proxmox Python q1moscmy2015 Questionnaires Research Research tools RPM SASSIAN Sassian 85-89 Sassians 85-89 SCO Security Sekolah Sekolah Alam Shah Shell script Software License Solaris SongketMail SongketMailFilter sourceforge spam spamassassin Spoof SSH Survey SVR4 System Tools Technorati Terjemahan Terminal TMnet Tor Training translation Treasury Malaysia Trend Micro Twitter Ubuntu Unix Virtualization VMS VOIP Wang Web Server Windows Zimbra

LinuxMalaysia Mastodon