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The Trivial File Transfer Protocol (TFTP) server must not be installed unless it is required, and if required, the RHEL 9 TFTP daemon must be configured to operate in secure mode.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-257835RHEL-09-215060SV-257835r1155679_ruleCCI-000366high
Description
Removing the "tftp-server" package decreases the risk of the accidental (or intentional) activation of tftp services. If TFTP is required for operational support (such as transmission of router configurations), its use must be documented with the information systems security manager (ISSM), restricted to only authorized personnel, and have access control rules established. Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.
STIGDate
Red Hat Enterprise Linux 9 Security Technical Implementation Guide2026-02-05

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CFG-01Configuration Management Program
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
MON-01Continuous Monitoring
1.00
MON-01.7File Integrity Monitoring (FIM)
1.00
CFG-02Secure Baseline Configurations
0.50
CFG-02.7Approved Configuration Deviations
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (100) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-12Session Termination
1.00
AC-16(1)Dynamic Attribute Association
1.00
AC-17(1)Monitoring and Control
1.00
AC-2Account Management
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-24(1)Transmit Access Authorization Information
1.00
AC-25Reference Monitor
1.00

+90 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.4.1
1.00
3.4.2
1.00
CCI1 mapping
CCI-000366
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-09
1.00
PR.PS-01
1.00
PR.DS-10
0.50
PR.PSPlatform Security
0.50
PR.PS-05
0.50

Who does this work

10 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-257835r1155679_chk)

Verify if TFTP is installed, it is configured to operate in secure mode. Note: If TFTP is not required, it must not be installed. If TFTP is not installed, this rule is not applicable. Check to see if TFTP server is installed with the following command: $ sudo dnf list --installed tftp-server Updating Subscription Management repositories. Installed Packages tftp-server.x86_64 5.2-38.el9 @rhel-9-for-x86_64-appstream-rpms Verify the TFTP daemon, if tftp.server is installed, is configured to operate in secure mode with the following command: $ grep -i execstart /usr/lib/systemd/system/tftp.service ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot Note: The "-s" option ensures the TFTP server only serves files from the specified directory, which is a security measure to prevent unauthorized access to other parts of the file system.

Fix Text (F-61500r1155678_fix)

Configure RHEL 9 so that TFTP operates in secure mode if installed. If TFTP server is not required, remove it with the following command: $ sudo dnf -y remove tftp-server Configure the TFTP daemon to operate in secure mode with the following command: $ sudo systemctl edit tftp.service In the editor, enter: [Service] ExecStart=/usr/sbin/in.tftpd -s /var/lib/tftpboot After making changes, reload the systemd daemon and restart the TFTP service as follows: $ sudo systemctl daemon-reload $ sudo systemctl restart tftp.service If the "-s" option is not present in the "ExecStart" line or if the line is missing, this is a finding.