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V-216115

CAT III (Low)

Consecutive login attempts for SSH must be limited to 3.

Rule ID

SV-216115r1155803_rule

STIG

Solaris 11 X86 Security Technical Implementation Guide

Version

V3R5

CCIs

CCI-000366

Discussion

Setting the authentication login limit to a low value will disconnect the attacker and force a reconnect, which severely limits the speed of such brute-force attacks.

Check Content

Determine if consecutive login attempts are limited to 3, and that they are logged.

# grep "^MaxAuthTries" /etc/ssh/sshd_config

If the output of this command is not "MaxAuthTries 6" and "MaxAuthTriesLog 6" this is a finding.

Note: Solaris SSH MaxAuthTries of 6 maps to 3 actual failed attempts.

Fix Text

The root role is required.

Modify the sshd_config file.

# pfedit /etc/ssh/sshd_config

Locate the lines containing:

MaxAuthTries
MaxAuthTriesLog

Change them to:

MaxAuthTries 6
MaxAuthTriesLog 6

Restart the SSH service.

# svcadm restart svc:/network/ssh

Note: Solaris SSH MaxAuthTries of 6 maps to 3 actual failed attempts.