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

The Cisco BGP router must be configured to use the maximum prefixes feature to protect against route table flooding and prefix de-aggregation attacks.

DISA Rule

SV-216694r531086_rule

Vulnerability Number

V-216694

Group Title

SRG-NET-000362-RTR-000117

Rule Version

CISC-RT-000560

Severity

CAT II

CCI(s)

CCI-002385 - The information system protects against or limits the effects of organization-defined types of denial of service attacks by employing organization-defined security safeguards.

Weight

Fix Recommendation

Configure the router to use the maximum prefixes feature to protect against route table flooding and prefix de-aggregation attacks as shown in the example below:

R1(config)#router bgp xx
R1(config-router)#neighbor x.1.1.9 maximum-prefix nnnnnnn
R1(config-router)#neighbor x.2.1.7 maximum-prefix nnnnnnn

Check Contents

Review the router configuration to verify that the number of received prefixes from each eBGP neighbor is controlled.

router bgp xx
neighbor x.1.1.9 remote-as yy
neighbor x.1.1.9 maximum-prefix nnnnnnn
neighbor x.2.1.7 remote-as zz
neighbor x.2.1.7 maximum-prefix nnnnnnn

If the router is not configured to control the number of prefixes received from each peer to protect against route table flooding and prefix de-aggregation attacks, this is a finding.

The Cisco BGP router must be configured to use the maximum prefixes feature to protect against route table flooding and prefix de-aggregation attacks.

DISA Rule

Vulnerability Number

Group Title

Rule Version

Severity

CCI(s)

Weight

Fix Recommendation

Check Contents

Vulnerability Number

Documentable

Rule Version

Severity Override Guidance

Check Content Reference

Target Key

Comments