The Cisco switch must be configured to implement replay-resistant authentication mechanisms for network access to privileged accounts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-101521	CISC-ND-000530	SV-110625r1_rule		Medium

Description
A replay attack may enable an unauthorized user to gain access to the application. Authentication sessions between the authenticator and the application validating the user credentials must not be vulnerable to a replay attack. An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message.

STIG	Date
Cisco NX-OS Switch NDM Security Technical Implementation Guide	2020-05-20

Details

Check Text ( C-100405r1_chk )
Verify that FIPS mode is enabled as shown in the example below: fips mode enable Note: Cisco NX-OS software supports only SSH version 2 (SSHv2). Beginning in Cisco NX-OS Release 5.1, SSH runs in FIPS mode. Source: Cisco Nexus 7000 Series NX-OS Security Configuration Guide, Release 6.x If the switch is not configured to implement cryptographic mechanisms to protect the confidentiality of remote maintenance sessions, this is a finding.

Check Text ( C-100405r1_chk )

Verify that FIPS mode is enabled as shown in the example below:

fips mode enable

Note: Cisco NX-OS software supports only SSH version 2 (SSHv2). Beginning in Cisco NX-OS Release 5.1, SSH runs in FIPS mode. Source: Cisco Nexus 7000 Series NX-OS Security Configuration Guide, Release 6.x

If the switch is not configured to implement cryptographic mechanisms to protect the confidentiality of remote maintenance sessions, this is a finding.

Fix Text (F-107203r1_fix)
Enable fips mode via the command fips mode enable.