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The IBM RACF SSH daemon must be configured to use a FIPS 140-2 compliant cryptographic algorithm.


Overview

Finding ID Version Rule ID IA Controls Severity
V-223807 RACF-SH-000020 SV-223807r604139_rule High
Description
Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. Cryptographic modules must adhere to the higher standards approved by the federal government since this provides assurance they have been tested and validated.
STIG Date
IBM z/OS RACF Security Technical Implementation Guide 2021-07-05

Details

Check Text ( C-25480r515109_chk )
Locate the SSH daemon configuration file, which may be found in /etc/ssh/ directory.

Alternately:
From UNIX System Services ISPF Shell navigate to ribbon select tools.
Select option 1 - Work with Processes.

If SSH Daemon is not active, this is not a finding.

Examine SSH daemon configuration file.
sshd_config

If there are no "Ciphers" lines or the ciphers list contains any cipher not starting with "3des" or "aes", this is a finding.

If the MACs line is not configured to "hmac-sha1" or greater this is a finding.

Examine the z/OS-specific sshd server system-wide configuration:
zos_sshd_config

If any of the following is untrue, this is a finding.

FIPSMODE=YES
CiphersSource=ICSF
MACsSource=ICSF
Fix Text (F-25468r515110_fix)
Edit the SSH daemon configuration and remove any ciphers not starting with "3des" or "aes". If necessary, add a "Ciphers" line using FIPS 140-2 compliant algorithms.

Configure for message authentication to MACs "hmac-sha1" or greater.

Edit the z/OS-specific sshd server system-wide configuration file configuration as follows:
FIPSMODE=YES
CiphersSource=ICSF
MACsSource=ICSF