The Cisco ISR 4000 Series router must enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period.

From Cisco IOS XE Release 3 NDM Security Technical Implementation Guide

Associated with: CCI-000044

SV-91017r1_rule The Cisco ISR 4000 Series router must enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period.

Vulnerability discussion

By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced.

Check content

Verify that the Cisco ISR 4000 Series router limits the number of consecutive invalid login attempts to "3" within "15" minutes. The configuration should look similar to the example below: ip ssh authentication-retries 3 login block-for 600 attempts 3 within 900 If the number of consecutive login attempts is not set to "3" within "15" minutes, this is a finding.

Fix text

Configure SSH using: ip ssh authentication-retries 3 login block-for 600 attempts 3 within 900

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