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AIX must turn on SSH daemon reverse name checking.


Overview

Finding ID Version Rule ID IA Controls Severity
V-91727 AIX7-00-002115 SV-101825r1_rule 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 2019-04-29

Details

Check Text ( C-90881r3_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-97925r1_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