CVE-2019-17659 (GCVE-0-2019-17659)

Vulnerability from cvelistv5 – Published: 2025-03-17 13:06 – Updated: 2025-03-17 13:35
VLAI?
Summary
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 leveraging knowledge of the private key from another installation or a firmware image.
Severity ?
3.6 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:X/RC:X
CWE
  • CWE-798 - Improper access control
Assigner
References
Impacted products
Vendor Product Version
Fortinet FortiSIEM Affected: 5.2.6
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          "value": "Please upgrade to FortiSIEM version 5.2.7 and above where this issue is resolved. \r\nWorkaround (for FortiSIEM version 5.2.6 and lower): \r\nCustomers who are not using the reverse tunnel feature are advised to disable SSH service on port 19999  by following the steps below :\r\n1. SSH to the Supervisor node as the root user.\r\n2. Remove tunneluser SSH configuration file to disable listening on port 19999:\r\nrm -f /etc/ssh/sshd_config.tunneluser\r\necho rm -f /etc/ssh/sshd_config.tunneluser \u003e\u003e /etc/init.d/phProvision.sh\r\n3. Then terminate sshd running on TCP Port 19999 as follows:\r\npkill -f /usr/sbin/sshd -p 19999\r\n4.Additional steps can be performed on Supervisor to remove the keys associated with tunneluser account:\r\nrm -f /opt/phoenix/deployment/id_rsa.pub.tunneluser\r\nrm -f /home/tunneluser/.ssh/authorized_keys\r\nrm -f /opt/phoenix/id_rsa.tunneluser ~admin/.ssh/id_rsa\r\nCustomers are also advised to disable \"tunneluser\" SSH access on port 22 by following the steps bwlow:\r\n1. SSH to the Supervisor node as the root user.\r\n2. Add/edit the following line in sshd_config file: \r\necho DenyUsers tunneluser \u003e\u003e  /etc/ssh/sshd_config\r\n3. service sshd restart"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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