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JUSX-AG-000122 - The Juniper SRX Services Gateway Firewall must protect against known types of Denial of Service (DoS) attacks by implementing signature-based screens.

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Information

If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Installation of content filtering gateways and application layer firewalls at key boundaries in the architecture mitigates the risk of DoS attacks. These attacks can be detected by matching observed communications traffic with patterns of known attacks.

Juniper SRX Firewall DoS protections can be configured by either using a Screen or within the global flow options. Screens, also known as IDS-options, block various layer 3 and 4 attacks. Screen objects are configured with various screen-specific options and then assigned to a zone. The Juniper SRX can be configured with Screens to protect against the following signature-based DoS attacks: ICMP based attacks such as ping of death, IP based attacks such as IP spoofing and teardrop, and TCP based attacks such as TCP headers and land.

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

Solution

The following example commands configure security screens under a profile named untrust-screen. Screen options with configurable thresholds may be customized to minimize/prevent operational impact on traffic performance.

[edit]
set security screen ids-option <zone-name> <screen name> <option name> <value>

Based on 800-53 requirements and vendor recommendations, the following signature-based screens are required, at a minimum, for use in DoD configurations.

set security screen ids-option untrust-screen icmp ping-death
set security screen ids-option untrust-screen ip bad-option
set security screen ids-option untrust-screen ip record-route-option
set security screen ids-option untrust-screen ip timestamp-option
set security screen ids-option untrust-screen ip security-option
set security screen ids-option untrust-screen ip stream-option
set security screen ids-option untrust-screen ip spoofing
set security screen ids-option untrust-screen ip source-route-option
set security screen ids-option untrust-screen ip unknown-protocol
set security screen ids-option untrust-screen ip tear-drop
set security screen ids-option untrust-screen ip ipv6-extension-header hop-by-hop-header
jumbo-payload-option
set security screen ids-option untrust-screen ip ipv6-extension-header hop-by-hop-header
router-alert-option
set security screen ids-option untrust-screen ip ipv6-extension-header hop-by-hop-header
quick-start-option
set security screen ids-option untrust-screen ip ipv6-extension-header routing-header
set security screen ids-option untrust-screen ip ipv6-extension-header fragment-header
set security screen ids-option untrust-screen ip ipv6-extension-header no-next-header
set security screen ids-option untrust-screen ip ipv6-extension-header shim6-header
set security screen ids-option untrust-screen ip ipv6-extension-header mobility-header
set security screen ids-option untrust-screen ip ipv6-malformed-header
set security screen ids-option untrust-screen tcp syn-fin
set security screen ids-option untrust-screen tcp fin-no-ack
set security screen ids-option untrust-screen tcp tcp-no-flag
set security screen ids-option untrust-screen tcp syn-frag
set security screen ids-option untrust-screen tcp land

To enable screen protection, the screen profile must be associated with individual security zones using the following command. Recommend assigning 'untrust-screen' profile name to the default zone named 'untrust'.

[edit]
set security zone security-zone <ZONE NAME> screen <SCREEN PROFILE NAME>
Example: set security zones security-zone untrust screen untrust-screen

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_SRX_SG_Y22M10_STIG.zip

Item Details

References: CAT|I, CCI|CCI-002385, Rule-ID|SV-214531r557389_rule, STIG-ID|JUSX-AG-000122, STIG-Legacy|SV-80817, STIG-Legacy|V-66327, Vuln-ID|V-214531

Plugin: Juniper

Control ID: a9320663f6e93cd8010a346b6dbd78e943ae019297520bc47330e75dc2dfbc90