Detections
Analytics

CISC-RT-000780 - The Cisco PE router must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks - DoS attacks.

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

View Next Audit Version

Information

DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS) attacks are referred to as volumetric attacks and have the objective of overloading a network or circuit to deny or seriously degrade performance, which denies access to the services that normally traverse the network or circuit. Volumetric attacks have become relatively easy to launch using readily available tools such as Low Orbit Ion Cannon or botnets.

Measures to mitigate the effects of a successful volumetric attack must be taken to ensure that sufficient capacity is available for mission-critical traffic. Managing capacity may include, for example, establishing selected network usage priorities or quotas and enforcing them using rate limiting, Quality of Service (QoS), or other resource reservation control methods. These measures may also mitigate the effects of sudden decreases in network capacity that are the result of accidental or intentional physical damage to telecommunications facilities (such as cable cuts or weather-related outages).

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Step 1: Configure a class map for the SCAVENGER class.

RP/0/0/CPU0:R2(config)#class-map match-all SCAVENGER
RP/0/0/CPU0:R2(config-cmap)#match dscp cs1
RP/0/0/CPU0:R2(config-cmap)#exit

Step 2: Add the SCAVENGER class to the policy map as shown in the example below.

RP/0/0/CPU0:R2(config)#policy-map QOS_POLICY
RP/0/0/CPU0:R2(config-pmap)#no class class-default
RP/0/0/CPU0:R2(config-pmap)#class SCAVENGER
RP/0/0/CPU0:R2(config-pmap-c)#bandwidth percent 5
RP/0/0/CPU0:R2(config-pmap-c)#class class-default
RP/0/0/CPU0:R2(config-pmap-c)#bandwidth percent 10
RP/0/0/CPU0:R2(config-pmap-c)#end

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS-XR_Router_Y21M04_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5(2), CAT|II, CCI|CCI-001095, Rule-ID|SV-216806r531087_rule, STIG-ID|CISC-RT-000780, STIG-Legacy|SV-105957, STIG-Legacy|V-96819, Vuln-ID|V-216806

Plugin: Cisco

Control ID: b90da95b686c6c2c50b49ae383543ee2536a858ac28fe2263720e80db09585b4