Check: CISC-ND-001150
Cisco IOS Switch NDM STIG:
CISC-ND-001150
(in versions v2 r9 through v1 r0.1)
Title
The Cisco switch must be configured to authenticate Network Time Protocol (NTP) sources using authentication that is cryptographically based. (Cat II impact)
Discussion
If NTP is not authenticated, an attacker can introduce a rogue NTP server. This rogue server can then be used to send incorrect time information to network devices, which will make log timestamps inaccurate and affect scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.
Check Content
Review the Cisco switch configuration to verify that it authenticates NTP sources using cryptographically based authentication as shown in the configuration example below: ntp authentication-key 1 md5 121B0A151012 7 ntp authenticate ntp trusted-key 1 ntp server x.x.x.x key 1 ntp server y.y.y.y key 1 If the Cisco switch is not configured to authenticate NTP sources using authentication that is cryptographically based, this is a finding.
Fix Text
Configure the Cisco switch to authenticate NTP sources using authentication that is cryptographically based as shown in the example below: SW2(config)#ntp authenticate SW2(config)#ntp authentication-key 1 md5 xxxxxx SW2(config)#ntp trusted-key 1 SW2(config)#ntp server x.x.x.x key 1 SW2(config)#ntp server y.y.y.y key 1
Additional Identifiers
Rule ID: SV-220606r879768_rule
Vulnerability ID: V-220606
Group Title: SRG-APP-000395-NDM-000347
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001967 |
The information system authenticates organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based. |
Controls
Number | Title |
---|---|
IA-3 (1) |
Cryptographic Bidirectional Authentication |