STIGQter STIGQter: STIG Summary: Cisco IOS Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

The Cisco switch must be configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies.

DISA Rule

SV-220419r622190_rule

Vulnerability Number

V-220419

Group Title

SRG-NET-000018-RTR-000001

Rule Version

CISC-RT-000010

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure ACLs to allow or deny traffic for specific source and destination addresses as well as ports and protocols between various subnets as required. The commands below were used to create the configuration as shown in the check content:

SW1(config)#ip access-list extended FILTER_SERVER_TRAFFIC
SW1(config-ext-nacl)#permit tcp any 10.1.12.0 0.0.0.255 eq 515 631 9100
SW1(config-ext-nacl)#permit tcp any 10.1.13.0 0.0.0.255 eq 1433 1434 4022
SW1(config-ext-nacl)#permit icmp any any
SW1(config-ext-nacl)#permit ospf any any
SW1(config-ext-nacl)#deny ip any any
SW1(config-ext-nacl)#exit
SW1(config)#interface g0/1
SW1(config-if)#ip access-group FILTER_SERVER_TRAFFIC in
SW1(config-if)#end

Alternate: Inter-VLAN routing

SW1(config)#ip access-list extended FILTER_PRINTER_VLAN
SW1(config-ext-nacl)#permit tcp any any eq lpd 631 9100
SW1(config-ext-nacl)#permit icmp any any
SW1(config-ext-nacl)#deny ip any any
SW1(config-ext-nacl)#exit
SW1(config)#ip access-list extended FILTER_SQL_VLAN
SW1(config-ext-nacl)#permit tcp any any eq 1433 1434 4022
SW1(config-ext-nacl)#permit icmp any any
SW1(config-ext-nacl)#deny ip any any
SW1(config-ext-nacl)#exit
SW1(config)#interface vlan 12
SW1(config-if)#ip access-group FILTER_PRINTER_VLAN out
SW1(config-if)#exit
SW1(config)#interface vlan 13
SW1(config-if)#ip access-group FILTER_SQL_VLAN out
SW1(config-if)#end

Check Contents

Review the switch configuration to verify that ACLs are configured to allow or deny traffic for specific source and destination addresses as well as ports and protocols. For example, the configuration below will allow only printer traffic into subnet 10.1.12.0/24 and SQL traffic into subnet 10.1.13.0/24. ICMP is allowed for troubleshooting and OSPF is the routing protocol used within the network.

interface GigabitEthernet0/1
no switchport
ip address 10.2.1.1 255.255.255.252
ip access-group FILTER_SERVER_TRAFFIC in
…
…
…
ip access-list extended FILTER_SERVER_TRAFFIC
permit tcp any 10.1.12.0 0.0.0.255 eq lpd 631 9100
permit tcp any 10.1.13.0 0.0.0.255 eq 1433 1434 4022
permit icmp any any
permit ospf any any
deny ip any any

Alternate: Inter-VLAN routing

interface Vlan12
ip address 10.1.12.1 255.255.255.0
ip access-group FILTER_PRINTER_VLAN out
!
interface Vlan13
ip address 10.1.13.1 255.255.255.0
ip access-group FILTER_SQL_VLAN out
…
…
…
ip access-list extended FILTER_PRINTER_VLAN
permit tcp any any eq lpd 631 9100
permit icmp any any
deny ip any any
ip access-list extended FILTER_SQL_VLAN
permit tcp any any eq 1433 1434 4022
permit icmp any any
deny ip any any

If the switch is not configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies, this is a finding.

Vulnerability Number

V-220419

Documentable

False

Rule Version

CISC-RT-000010

Severity Override Guidance

Review the switch configuration to verify that ACLs are configured to allow or deny traffic for specific source and destination addresses as well as ports and protocols. For example, the configuration below will allow only printer traffic into subnet 10.1.12.0/24 and SQL traffic into subnet 10.1.13.0/24. ICMP is allowed for troubleshooting and OSPF is the routing protocol used within the network.

interface GigabitEthernet0/1
no switchport
ip address 10.2.1.1 255.255.255.252
ip access-group FILTER_SERVER_TRAFFIC in
…
…
…
ip access-list extended FILTER_SERVER_TRAFFIC
permit tcp any 10.1.12.0 0.0.0.255 eq lpd 631 9100
permit tcp any 10.1.13.0 0.0.0.255 eq 1433 1434 4022
permit icmp any any
permit ospf any any
deny ip any any

Alternate: Inter-VLAN routing

interface Vlan12
ip address 10.1.12.1 255.255.255.0
ip access-group FILTER_PRINTER_VLAN out
!
interface Vlan13
ip address 10.1.13.1 255.255.255.0
ip access-group FILTER_SQL_VLAN out
…
…
…
ip access-list extended FILTER_PRINTER_VLAN
permit tcp any any eq lpd 631 9100
permit icmp any any
deny ip any any
ip access-list extended FILTER_SQL_VLAN
permit tcp any any eq 1433 1434 4022
permit icmp any any
deny ip any any

If the switch is not configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies, this is a finding.

Check Content Reference

M

Target Key

4065

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