Finding ID | Version | Rule ID | IA Controls | Severity |
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V-218004 | RHEL-06-000243 | SV-218004r505923_rule | Medium |
Description |
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Approved algorithms should impart some level of confidence in their implementation. These are also required for compliance. |
STIG | Date |
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Red Hat Enterprise Linux 6 Security Technical Implementation Guide | 2020-09-03 |
Check Text ( C-19485r377027_chk ) |
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Only FIPS-approved ciphers should be used. To verify that only FIPS-approved ciphers are in use, run the following command: # grep -i Ciphers /etc/ssh/sshd_config Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,aes192-cbc,aes256-cbc If any ciphers listed are not FIPS-approved, this is a finding. |
Fix Text (F-19483r377028_fix) |
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Limit the ciphers to those algorithms which are FIPS-approved. Counter (CTR) mode is also preferred over cipher-block chaining (CBC) mode. The following line in "/etc/ssh/sshd_config" demonstrates use of FIPS-approved ciphers: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,aes192-cbc,aes256-cbc Note: The man page "sshd_config(5)" contains a list of supported ciphers. |