CVE-2019-17659
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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.65% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 50.6% of scored records. A rank, not a probability.
- NVD base score
- 8.1 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
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.
04 Metadata
- Published
- 2025-03-17 13:06Z1 YR AGO
- Last updated
- 2025-03-17 13:35Z1 YR AGO
- Reserved
- 2019-10-16
- Assigning CNA
- fortinet
- Record state
- PUBLISHED
- Severity
- Low (CVSS 3.6)
- CNA CVSS vector
- 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
- Weaknesses
- CWE-798Use of Hard-coded CredentialsBase
- Data version
- 5.1
- Document digest
- ee71ca67dc97674ca5bff4450119926cf99966d38c54d48f0bc71a89f9259bc1
05 Affected products
06 References
- fortiguard.fortinet.comhttps://fortiguard.fortinet.com/psirt/FG-IR-19-296
07 Remediation
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