I - Mission Critical Classified
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000148-L2S-000015
<GroupDescription></GroupDescription>Group -
The Cisco switch must uniquely identify all network-connected endpoint devices before establishing any connection.
<VulnDiscussion>Controlling LAN access via 802.1x authentication can assist in preventing a malicious user from connecting an unauthorized PC...Rule High Severity -
SRG-NET-000168-L2S-000019
<GroupDescription></GroupDescription>Group -
The Cisco switch must authenticate all VLAN Trunk Protocol (VTP) messages with a hash function using the most secured cryptographic algorithm available.
<VulnDiscussion>VLAN Trunk Protocol (VTP) provides central management of VLAN domains, thus reducing administration in a switched network. Wh...Rule Medium Severity -
SRG-NET-000331-L2S-000001
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured for authorized users to select a user session to capture.
<VulnDiscussion>Without the capability to select a user session to capture/record or view/hear, investigations into suspicious or harmful eve...Rule Medium Severity -
SRG-NET-000332-L2S-000002
<GroupDescription></GroupDescription>Group -
The Cisco switch must be configured for authorized users to remotely view, in real time, all content related to an established user session from a component separate from The Cisco switch.
<VulnDiscussion>Without the capability to remotely view/hear all content related to a user session, investigations into suspicious user activ...Rule Medium Severity -
SRG-NET-000343-L2S-000016
<GroupDescription></GroupDescription>Group -
The Cisco switch must authenticate all endpoint devices before establishing any connection.
<VulnDiscussion>Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. ...Rule Medium Severity -
SRG-NET-000362-L2S-000021
<GroupDescription></GroupDescription>Group -
The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches and hosts.
<VulnDiscussion>Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the...Rule Low Severity -
SRG-NET-000362-L2S-000022
<GroupDescription></GroupDescription>Group -
The Cisco switch must have BPDU Guard enabled on all user-facing or untrusted access switch ports.
<VulnDiscussion>If a rogue switch is introduced into the topology and transmits a Bridge Protocol Data Unit (BPDU) with a lower bridge priori...Rule Medium Severity -
SRG-NET-000362-L2S-000023
<GroupDescription></GroupDescription>Group -
The Cisco switch must have STP Loop Guard enabled.
<VulnDiscussion>The Spanning Tree Protocol (STP) loop guard feature provides additional protection against STP loops. An STP loop is created ...Rule Medium Severity -
SRG-NET-000362-L2S-000024
<GroupDescription></GroupDescription>Group -
The Cisco switch must have Unknown Unicast Flood Blocking (UUFB) enabled.
<VulnDiscussion>Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN nu...Rule Medium Severity -
SRG-NET-000362-L2S-000025
<GroupDescription></GroupDescription>Group -
The Cisco switch must have DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources.
<VulnDiscussion>In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, route...Rule Medium Severity -
SRG-NET-000362-L2S-000026
<GroupDescription></GroupDescription>Group -
The Cisco switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports.
<VulnDiscussion>IP Source Guard provides source IP address filtering on a Layer 2 port to prevent a malicious host from impersonating a legit...Rule Medium Severity -
SRG-NET-000362-L2S-000027
<GroupDescription></GroupDescription>Group -
The Cisco switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.
<VulnDiscussion>DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC addre...Rule Medium Severity -
SRG-NET-000512-L2S-000001
<GroupDescription></GroupDescription>Group -
The Cisco switch must have Storm Control configured on all host-facing switchports.
<VulnDiscussion>A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm ...Rule Low Severity -
SRG-NET-000512-L2S-000002
<GroupDescription></GroupDescription>Group -
The Cisco switch must have IGMP or MLD Snooping configured on all VLANs.
<VulnDiscussion>IGMP and MLD snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP or MLD membership repo...Rule Low Severity -
SRG-NET-000512-L2S-000004
<GroupDescription></GroupDescription>Group -
The Cisco switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections.
<VulnDiscussion>In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to b...Rule Medium Severity -
SRG-NET-000512-L2S-000007
<GroupDescription></GroupDescription>Group -
The Cisco switch must have all disabled switch ports assigned to an unused VLAN.
<VulnDiscussion>It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attack...Rule Medium Severity -
SRG-NET-000512-L2S-000008
<GroupDescription></GroupDescription>Group -
The Cisco switch must not have the default VLAN assigned to any host-facing switch ports.
<VulnDiscussion>In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other ne...Rule Medium Severity -
SRG-NET-000512-L2S-000009
<GroupDescription></GroupDescription>Group -
The Cisco switch must have the default VLAN pruned from all trunk ports that do not require it.
<VulnDiscussion>The default VLAN (i.e., VLAN 1) is a special VLAN used for control plane traffic such as Spanning-Tree Protocol (STP), Dynami...Rule Medium Severity -
SRG-NET-000512-L2S-000010
<GroupDescription></GroupDescription>Group -
The Cisco switch must not use the default VLAN for management traffic.
<VulnDiscussion>Switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with directly connected switches using...Rule Medium Severity -
SRG-NET-000512-L2S-000011
<GroupDescription></GroupDescription>Group -
The Cisco switch must have all user-facing or untrusted ports configured as access switch ports.
<VulnDiscussion>Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trun...Rule Medium Severity -
SRG-NET-000512-L2S-000012
<GroupDescription></GroupDescription>Group -
The Cisco switch must have the native VLAN assigned to an ID other than the default VLAN for all 802.1q trunk links.
<VulnDiscussion>VLAN hopping can be initiated by an attacker who has access to a switch port belonging to the same VLAN as the native VLAN of...Rule Medium Severity -
SRG-NET-000512-L2S-000013
<GroupDescription></GroupDescription>Group -
The Cisco switch must not have any switchports assigned to the native VLAN.
<VulnDiscussion>Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trun...Rule Low Severity
Node 2
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