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

The Cisco BGP switch must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.

DISA Rule

SV-221028r622190_rule

Vulnerability Number

V-221028

Group Title

SRG-NET-000018-RTR-000006

Rule Version

CISC-RT-000540

Severity

CAT III

CCI(s)

• CCI-000032 - The information system enforces information flow control using organization-defined security policy filters as a basis for flow control decisions for organization-defined information flows.

Weight

10

Fix Recommendation

Configure the switch to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

SW1(config)#router bgp xx
SW1(config-switch)#bgp enforce-first-as

Check Contents

Review the switch configuration to verify the switch is configured to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

By default, Cisco IOS enforces the first AS in the AS_PATH attribute for all route advertisements. Review the switch configuration to verify that the command no bgp enforce-first-as is not configured.

router bgp xx
no synchronization
no bgp enforce-first-as

If the switch is not configured to reject updates from peers that do not list their AS number as the first AS in the AS_PATH attribute, this is a finding.

Vulnerability Number

V-221028

Documentable

False

Rule Version

CISC-RT-000540

Severity Override Guidance

Review the switch configuration to verify the switch is configured to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

By default, Cisco IOS enforces the first AS in the AS_PATH attribute for all route advertisements. Review the switch configuration to verify that the command no bgp enforce-first-as is not configured.

router bgp xx
no synchronization
no bgp enforce-first-as

If the switch is not configured to reject updates from peers that do not list their AS number as the first AS in the AS_PATH attribute, this is a finding.

Check Content Reference

M

Target Key

4074

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