Layer 2 Switch Security Technical Implementation Guide - Cisco

Layer 2 Switch Security Technical Implementation Guide - Cisco

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Version / Release: V8R27

Published: 2019-01-09

Updated At: 2019-01-27 11:45:10

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    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-3012r4_rule NET0230 HIGH Network devices must be password protected. Network access control mechanisms interoperate to prevent unauthorized access and to enforce the organization's security policy. Access to the network must be categorized as administrator, user, or guest so the appropriate authorization can be assigned to
    SV-3013r5_rule NET0340 MEDIUM Network devices must display the DoD-approved logon banner warning. All network devices must present a DoD-approved warning banner prior to a system administrator logging on. The banner should warn any unauthorized user not to proceed. It also should provide clear and unequivocal notice to both authorized and unauthorized
    SV-15453r2_rule NET1639 MEDIUM The network element must timeout management connections for administrative access after 10 minutes or less of inactivity. Setting the timeout of the session to 10 minutes or less increases the level of protection afforded critical network components.Information Assurance Officer
    SV-15330r2_rule NET0820 LOW The network element must have DNS servers defined if it is configured as a client resolver. The susceptibility of IP addresses to spoofing translates to DNS host name and IP address mapping vulnerabilities. For example, suppose a source host wishes to establish a connection with a destination host and queries a DNS server for the IP address of
    SV-15332r2_rule NET0890 MEDIUM The network element must only allow SNMP access from addresses belonging to the management network. Detailed information about the network is sent across the network via SNMP. If this information is discovered by attackers it could be used to trace the network, show the networks topology, and possibly gain access to network devices.Information Assuranc
    SV-3043r4_rule NET1675 MEDIUM The network device must use different SNMP community names or groups for various levels of read and write access. Numerous vulnerabilities exist with SNMP; therefore, without unique SNMP community names, the risk of compromise is dramatically increased. This is especially true with vendors default community names which are widely known by hackers and other networking
    SV-3056r7_rule NET0460 HIGH Group accounts must not be configured for use on the network device. Group accounts configured for use on a network device do not allow for accountability or repudiation of individuals using the shared account. If group accounts are not changed when someone leaves the group, that person could possibly gain control of the
    SV-3057r6_rule NET0465 MEDIUM Authorized accounts must be assigned the least privilege level necessary to perform assigned duties. By not restricting authorized accounts to their proper privilege level, access to restricted functions may be allowed before authorized personnel are trained or experienced enough to use those functions. Network disruptions or outages may occur due to mis
    SV-3058r5_rule NET0470 MEDIUM Unauthorized accounts must not be configured for access to the network device. A malicious user attempting to gain access to the network device may compromise an account that may be unauthorized for use. The unauthorized account may be a temporary or inactive account that is no longer needed to access the device. Denial of Service
    SV-41449r2_rule NET0600 HIGH The network element must be configured to ensure passwords are not viewable when displaying configuration information. Many attacks information systems and network elements are launched from within the network. Hence, it is imperative that all passwords are encrypted so they cannot be intercepted by viewing the console or printout of the configuration. Information Assura
    SV-15451r4_rule NET1638 MEDIUM Management connections to a network device must be established using secure protocols with FIPS 140-2 validated cryptographic modules. Administration and management connections performed across a network are inherently dangerous because anyone with a packet sniffer and access to the right LAN segment can acquire the network device account and password information. With this intercepted
    SV-15455r3_rule NET1640 LOW The network element must log all attempts to establish a management connection for administrative access. Audit logs are necessary to provide a trail of evidence in case the network is compromised. Without an audit trail that provides a when, where, who and how set of information, repeat offenders could continue attacks against the network indefinitely. Wit
    SV-3072r3_rule NET1030 LOW The running configuration must be synchronized with the startup configuration after changes have been made and implemented. If the running and startup router configurations are not synchronized properly and a router malfunctions, it will not restart with all of the recent changes incorporated. If the recent changes were security related, then the routers would be vulnerable t
    SV-3078r3_rule NET0720 LOW Network devices must have TCP and UDP small servers disabled. Cisco IOS provides the "small services" that include echo, chargen, and discard. These services, especially their User Datagram Protocol (UDP) versions, are infrequently used for legitimate purposes. However, they have been used to launch denial of servic
    SV-15305r2_rule NET0730 LOW The network element must have the Finger service disabled. The finger service supports the UNIX finger protocol, which is used for querying a host about the users that are logged on. This service is not necessary for generic users. If an attacker were to find out who is using the network, they may use social engi
    SV-41467r2_rule NET0740 MEDIUM The network element must have HTTP service for administrative access disabled. The additional services the router is enabled for increases the risk for an attack since the router will listen for these services. In addition, these services provide an unsecured method for an attacker to gain access to the router. Most recent software
    SV-3143r4_rule NET0240 HIGH Network devices must not have any default manufacturer passwords. Network devices not protected with strong password schemes provide the opportunity for anyone to crack the password thus gaining access to the device and causing network outage or denial of service. Many default vendor passwords are well-known; hence, not
    SV-15302r2_rule NET0700 MEDIUM The network element must be running a current and supported operating system with all IAVMs addressed. Network devices that are not running the latest tested and approved versions of software are vulnerable to network attacks. Running the most current, approved version of system and device software helps the site maintain a stable base of security fixes an
    SV-15448r4_rule NET1636 HIGH The network devices must require authentication prior to establishing a management connection for administrative access. Network devices with no password for administrative access via a management connection provide the opportunity for anyone with network access to the device to make configuration changes enabling them to disrupt network operations resulting in a network ou
    SV-3196r4_rule NET1660 HIGH The network device must use SNMP Version 3 Security Model with FIPS 140-2 validated cryptography for any SNMP agent configured on the device. SNMP Versions 1 and 2 are not considered secure. Without the strong authentication and privacy that is provided by the SNMP Version 3 User-based Security Model (USM), an unauthorized user can gain access to network management information used to launch an
    SV-3210r4_rule NET1665 HIGH The network device must not use the default or well-known SNMP community strings public and private. Network devices may be distributed by the vendor pre-configured with an SNMP agent using the well-known SNMP community strings public for read only and private for read and write authorization. An attacker can obtain information about a network device usi
    SV-15469r6_rule NET0440 MEDIUM In the event the authentication server is unavailable, the network device must have a single local account of last resort defined. Authentication for administrative access to the device is required at all times. A single account of last resort can be created on the device's local database for use in an emergency such as when the authentication server is down or connectivity between t
    SV-15444r2_rule NET1624 MEDIUM The network element must time out access to the console port after 10 minutes or less of inactivity. Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition quickly terminati
    SV-30086r3_rule NET0894 MEDIUM The network device must only allow SNMP read-only access. Enabling write access to the device via SNMP provides a mechanism that can be exploited by an attacker to set configuration variables that can disrupt network operations.Information Assurance OfficerECSC-1
    SV-3971r2_rule NET-VLAN-004 MEDIUM VLAN 1 must not be used for user VLANs. In a VLAN-based network, switches use VLAN 1 as the default VLAN for in-band management and to communicate with other networking devices using Spanning-Tree Protocol (STP), Cisco Discovery Protocol (CDP), Dynamic Trunking Protocol (DTP), VLAN Trunking Pro
    SV-3972r2_rule NET-VLAN-005 LOW VLAN 1 must be pruned from all trunk and access ports that do not require it. VLAN 1 is a special VLAN that tags and handles most of the control plane traffic such as Spanning-Tree Protocol (STP), Cisco Discovery Protocol (CDP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP) all
    SV-3973r2_rule NET-VLAN-002 LOW Disabled switch ports must be placed in an unused VLAN (do not use VLAN1). It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.Information Assurance Officer
    SV-3984r2_rule NET-VLAN-009 MEDIUM Access switchports must not be assigned to the native VLAN. Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trunk port. Knowing the victim's MAC address and with the victim attached to a different switch belonging to the same trunk group, the
    SV-19270r4_rule NET1623 HIGH The network device must require authentication for console access. Network devices with no password for administrative access via the console provide the opportunity for anyone with physical access to the device to make configuration changes enabling them to disrupt network operations resulting in a network outage.Inform
    SV-15476r2_rule NET1021 LOW The network element must log all messages except debugging and send all log data to a syslog server. Logging is a critical part of router security. Maintaining an audit trail of system activity logs (syslog) can help identify configuration errors, understand past intrusions, troubleshoot service disruptions, and react to probes and scans of the network.
    SV-15449r3_rule NET1637 MEDIUM The network element must only allow management connections for administrative access from hosts residing in to the management network. Remote administration is inherently dangerous because anyone with a sniffer and access to the right LAN segment, could acquire the device account and password information. With this intercepted information they could gain access to the infrastructure and
    SV-15457r2_rule NET1645 MEDIUM The network element must be configured to timeout after 60 seconds or less for incomplete or broken SSH sessions. An attacker may attempt to connect to the device using SSH by guessing the authentication method, encryption algorithm, and keys. Limiting the amount of time allowed for authenticating and negotiating the SSH session reduces the window of opportunity for
    SV-15458r2_rule NET1646 MEDIUM The network element must be configured for a maximum number of unsuccessful SSH login attempts set at 3 before resetting the interface. An attacker may attempt to connect to the device using SSH by guessing the authentication method and authentication key or shared secret. Setting the authentication retry to 3 or less strengthens against a Brute Force attack.Information Assurance Officer
    SV-5614r3_rule NET0722 LOW Network devices must have the PAD service disabled. Packet Assembler Disassembler (PAD) is an X.25 component seldom used. It collects the data transmissions from the terminals and gathers them into a X.25 data stream and vice versa. PAD acts like a multiplexer for the terminals. If enabled, it can rende
    SV-5615r3_rule NET0724 LOW Network devices must have TCP Keep-Alives enabled for TCP sessions. Idle TCP sessions can be susceptible to unauthorized access and hijacking attacks. By default, routers do not continually test whether a previously connected TCP endpoint is still reachable. If one end of a TCP connection idles out or terminates abnormall
    SV-5622r2_rule NET-VLAN-008 MEDIUM The native VLAN must be assigned to a VLAN ID other than the default VLAN for all 802.1q trunk links. 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 the trunk link connecting to another switch in which the victim is connected to. If the attacker knows the victim's MAC address,
    SV-5623r2_rule NET-VLAN-007 MEDIUM Port trunking must be disabled on all access ports (do not configure trunk on, desirable, non-negotiate, or auto--only off). Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trunk port. Knowing the victims MAC address and with the victim attached to a different switch belonging to the same trunk group, ther
    SV-42190r5_rule NET-NAC-009 HIGH The switch must be configured to use 802.1x authentication on host facing access switch ports. The IEEE 802.1x standard is a client-server based access control and authentication protocol that restricts unauthorized clients from connecting to a local area network through host facing switch ports. The authentication server authenticates each client
    SV-5628r2_rule NET-VLAN-006 MEDIUM A dedicated management VLAN or VLANs must be configured to keep management traffic separate from user data and control plane traffic. All ports, including the internal sc0 interface, are configured by default to be members of VLAN 1. In a VLAN-based network, switches use VLAN 1 as the default VLAN for in-band management and to communicate with other networking devices using Spanning-Tre
    SV-15446r2_rule NET1629 LOW The network element’s auxiliary port must be disabled unless it is connected to a secured modem providing encryption and authentication. The use of POTS lines to modems connecting to network devices provides clear text of authentication traffic over commercial circuits that could be captured and used to compromise the network. Additional war dial attacks on the device could degrade the de
    SV-15314r2_rule NET0744 MEDIUM The administrator must ensure BSD r command services are disabled. Berkeley Software Distribution (BSD) “r” commands allow users to execute commands on remote systems using a variety of protocols. The BSD "r" commands (e.g., rsh, rlogin, rcp, rdump, rrestore, and rdist) are designed to provide convenient remote acce
    SV-15327r6_rule NET0813 MEDIUM Network devices must authenticate all NTP messages received from NTP servers and peers. Since NTP is used to ensure accurate log file time stamp information, NTP could pose a security risk if a malicious user were able to falsify NTP information. To launch an attack on the NTP infrastructure, a hacker could inject time that would be accepted
    SV-15460r2_rule NET1647 MEDIUM The network element must not use SSH Version 1 for administrative access. SSH Version 1 is a protocol that has never been defined in a standard. Since SSH-1 has inherent design flaws which make it vulnerable to, e.g., man-in-the-middle attacks, it is now generally considered obsolete and should be avoided by explicitly disabli
    SV-16259r4_rule NET0433 MEDIUM Network devices must use two or more authentication servers for the purpose of granting administrative access. The use of Authentication, Authorization, and Accounting (AAA) affords the best methods for controlling user access, authorization levels, and activity logging. By enabling AAA on the routers in conjunction with an authentication server such as TACACS+ o
    SV-16261r5_rule NET0441 HIGH The emergency administration account must be set to an appropriate authorization level to perform necessary administrative functions when the authentication server is not online. The emergency administration account is to be configured as a local account on the network devices. It is to be used only when the authentication server is offline or not reachable via the network. The emergency account must be set to an appropriate autho
    SV-19074r1_rule NET0990 MEDIUM The OOBM access switch is not physically connected to the managed network element OOBM interface. The OOBM access switch will connect to the management interface of the managed network elements. The management interface of the managed network element must be directly connected to the OOBM network to ensure seperation. An OOBM interface does not forwar
    SV-25881r2_rule NET0991 MEDIUM Managed NE OOBM interface is not configured with an OOBM network address. The OOBM access switch will connect to the management interface of the managed network elements. The management interface of the managed network element will be directly connected to the OOBM network. An OOBM interface does not forward transit traffic; th
    SV-19337r1_rule NET0994 MEDIUM The management interface is an access switchport and has not been assigned to a separate management VLAN. The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interfac
    SV-19338r1_rule NET0995 LOW An address has not been configured for the management VLAN from space belonging to the OOBM network assigned to that site. The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interfac
    SV-19339r1_rule NET0996 MEDIUM The access switchport connecting to the OOBM access switch is not the only port with membership to the management VLAN. The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interfac
    SV-19340r1_rule NET0997 LOW The management VLAN is not pruned from any VLAN trunk links belonging to the managed network’s infrastructure. The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interfac
    SV-19702r1_rule NET1003 MEDIUM The management VLAN is not configured with an IP address from the management network address block. If the management systems reside within the same layer 2 switching domain as the managed network elements, then separate VLANs will be deployed to provide separation at that level. In this case, the management network still has its own subnet while at the
    SV-20088r2_rule NET-VLAN-023 LOW Printers must be assigned to a VLAN that is not shared by unlike devices. Aspects of hardening the network wall plate may include traffic filtering or restrictions on connectivity to enforce a device-, community of interest-, or user-specific security policy. For example, if a printer were plugged into a switch port, it would b
    SV-20109r1_rule NET-NAC-032 LOW The IAO will ensure that all switchports configured using MAC port security will shutdown upon receiving a frame with a different layer 2 source address than what has been configured or learned for port security. The Port Security feature remembers the Ethernet MAC address connected to the switch port and allows only that MAC address to communicate on that port. If any other MAC address tries to communicate through the port, port security will disable the port. In
    SV-49133r1_rule NET-NAC-031 MEDIUM The switch must only allow a maximum of one registered MAC address per access port. Limiting the number of registered MAC addresses on a switch access port can help prevent a CAM table overflow attack. This type of attack lets an attacker exploit the hardware and memory limitations of a switch. If there are enough entries stored in a C
    SV-41497r1_rule NET0812 LOW The network element must use two or more NTP servers to synchronize time. Without synchronized time, accurately correlating information between devices becomes difficult, if not impossible. If you cannot successfully compare logs between each of your routers, switches, and firewalls, it will be very difficult to determine the e
    SV-38003r3_rule NET0405 MEDIUM A service or feature that calls home to the vendor must be disabled. Call home services or features will routinely send data such as configuration and diagnostic information to the vendor for routine or emergency analysis and troubleshooting. The risk that transmission of sensitive data sent to unauthorized persons could