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A use of hard-coded cryptographic key vulnerability in FortiSIEM version 5.2.6 may allow a remote unauthenticated attacker to obtain SSH access to the supervisor as the restricted user "tunneluser" by
A use of hard-coded cryptographic key vulnerability in FortiSIEM version 5.2.6 may allow a remote unauthenticated attacker to obtain SSH access to the supervisor as the restricted user "tunneluser" by
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
Please upgrade to FortiSIEM version 5.2.7 and above where this issue is resolved. Workaround (for FortiSIEM version 5.2.6 and lower): Customers who are not using the reverse tunnel feature are advised to disable SSH service on port 19999 by following the steps below : 1. SSH to the Supervisor node as the root user. 2. Remove tunneluser SSH configuration file to disable listening on port 19999: rm -f /etc/ssh/sshd_config.tunneluser echo rm -f /etc/ssh/sshd_config.tunneluser >> /etc/init.d/phProvision.sh 3. Then terminate sshd running on TCP Port 19999 as follows: pkill -f /usr/sbin/sshd -p 19999 4.Additional steps can be performed on Supervisor to remove the keys associated with tunneluser account: rm -f /opt/phoenix/deployment/id_rsa.pub.tunneluser rm -f /home/tunneluser/.ssh/authorized_keys rm -f /opt/phoenix/id_rsa.tunneluser ~admin/.ssh/id_rsa Customers are also advised to disable "tunneluser" SSH access on port 22 by following the steps bwlow: 1. SSH to the Supervisor node as the root user. 2. Add/edit the following line in sshd_config file: echo DenyUsers tunneluser >> /etc/ssh/sshd_config 3. service sshd restart