The Juniper EX switch must be configured to prohibit the use of cached authenticators after an organization-defined time period.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253927	JUEX-NM-000500	SV-253927r843814_rule		Medium

Description
Some authentication implementations can be configured to use cached authenticators. If cached authentication information is out-of-date, the validity of the authentication information may be questionable. The organization-defined time period should be established for each device depending on the nature of the device; for example, a device with just a few administrators in a facility with spotty network connectivity may merit a longer caching time period than a device with many administrators.

Description

Some authentication implementations can be configured to use cached authenticators. If cached authentication information is out-of-date, the validity of the authentication information may be questionable. The organization-defined time period should be established for each device depending on the nature of the device; for example, a device with just a few administrators in a facility with spotty network connectivity may merit a longer caching time period than a device with many administrators.

STIG	Date
Juniper EX Series Switches Network Device Management Security Technical Implementation Guide	2022-08-31

Details

Check Text ( C-57379r843812_chk )
Review the network device configuration to determine if the network device or its associated authentication server prohibits the use of cached authenticators after an organization-defined time period. Verify idle-timeouts, SSH keepalive messages, and SSH rekey are configured to meet the requirements of the target network. [edit system] login { idle-timeout 10; } system { services { ssh { protocol-version v2; client-alive-count-max (0..255); client-alive-interval (0..65535 seconds); rekey { data-limit (51200..4294967295 bytes); time-limit (1..1440 minutes); } } } } For externally authenticated accounts, verify the external authentication server enforces appropriate authenticator timeouts. If cached authenticators are used after an organization-defined time period, this is a finding.

Check Text ( C-57379r843812_chk )

Review the network device configuration to determine if the network device or its associated authentication server prohibits the use of cached authenticators after an organization-defined time period.

Verify idle-timeouts, SSH keepalive messages, and SSH rekey are configured to meet the requirements of the target network.
[edit system]
login {
idle-timeout 10;
}
system {
services {
ssh {
protocol-version v2;
client-alive-count-max (0..255);
client-alive-interval (0..65535 seconds);
rekey {
data-limit (51200..4294967295 bytes);
time-limit (1..1440 minutes);
}
}
}
}

For externally authenticated accounts, verify the external authentication server enforces appropriate authenticator timeouts.

If cached authenticators are used after an organization-defined time period, this is a finding.

Fix Text (F-57330r843813_fix)
Configure the network device or its associated authentication server to prohibit the use of cached authenticators after an organization-defined time period. set system login idle-timeout 10 set system services ssh protocol-version v2 set system services ssh client-alive-count-max (0..255) set system services ssh client-alive-interval (0..65535 seconds) set system services ssh rekey data-limit (51200..4294967295 bytes) set system services ssh rekey time-limit (1..1440 minutes)

Fix Text (F-57330r843813_fix)

Configure the network device or its associated authentication server to prohibit the use of cached authenticators after an organization-defined time period.

set system login idle-timeout 10

set system services ssh protocol-version v2
set system services ssh client-alive-count-max (0..255)
set system services ssh client-alive-interval (0..65535 seconds)
set system services ssh rekey data-limit (51200..4294967295 bytes)
set system services ssh rekey time-limit (1..1440 minutes)