OpenControls Logo

STIG Viewer

STIGViewer Support

RHEL 10 must be configured so that the Secure Shell (SSH) daemon does not allow Kerberos authentication.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-281255RHEL-10-700520SV-281255r1184755_ruleCCI-001813medium
Description
Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementations may be subject to exploitation. OpenSSH uses the first occurrence of a keyword it sees, and drop-in files are read in lexicographical order at the start of the configuration. Red Hat recommends using drop-in files rather than changing base configuration files.
STIGDate
Red Hat Enterprise Linux 10 Security Technical Implementation Guide2026-03-11

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) 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.

CHG-04.1Automated Access Enforcement / Auditing
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (50) 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-17(1)Monitoring and Control
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(10)Shared and Group Account Credential Change
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(7)Role-based Access Control
1.00
AC-4Information Flow Enforcement
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00

+40 more (top 10 by confidence shown)

CCI1 mapping
CCI-001813
1.00

Details

Check Text (C-281255r1184755_chk)

Verify RHEL 10 SSH daemons do not allow Kerberos authentication with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*kerberosauthentication' /etc/ssh/sshd_config.d/10-stig.conf:KerberosAuthentication no Verify the runtime setting with the following command: $ sudo sshd -T | grep -i kerberosauthentication kerberosauthentication no If the "KerberosAuthentication" keyword is not set to "no" in a drop-in that lexicographically precedes 50-redhat.conf, no output is returned, and the use of Kerberos authentication has not been documented with the information system security officer, this is a finding.

Fix Text (F-85721r1166716_fix)

Configure RHEL 10 SSH daemons to not allow Kerberos authentication. In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line: KerberosAuthentication no Restart the SSH service with the following command for the changes to take effect: $ sudo systemctl restart sshd.service