AIX must turn on SSH daemon reverse name checking.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215298 | AIX7-00-002115 | SV-215298r991589_rule | CCI-000366 | medium |
| Description | ||||
| If reverse name checking is off, SSH may allow a remote attacker to circumvent security policies and attempt to or actually login from IP addresses that are not permitted to access resources. | ||||
| STIG | Date | |||
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 | |||
Details
Check Text (C-215298r991589_chk)
Check the SSH daemon configuration for the "VerifyReverseMapping" setting using command:
# grep -i VerifyReverseMapping /etc/ssh/sshd_config | grep -v '^#'
VerifyReverseMapping yes
If the setting is not present or the setting is "no", this is a finding.
Fix Text (F-16494r294346_fix)
Edit the "/etc/sshd/sshd_config" file and add the following line:
VerifyReverseMapping yes
Restart the SSH daemon:
# stopsrc -s sshd
# startsrc -s sshd