The validity period for the RRSIGs covering a zones DNSKEY RRSet must be no less than two days and no more than one week.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-68599	IDNS-7X-000710	SV-83089r1_rule		Medium

Description
The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs in the zone and in the parent zone. This strategy limits the time during which an attacker can take advantage of a compromised key to forge responses. An attacker that has compromised a ZSK can use that key only during the KSK's signature validity interval. An attacker that has compromised a KSK can use that key for only as long as the signature interval of the RRSIG covering the DS RR in the delegating parent. These validity periods should be short, which will require frequent re-signing. To minimize the impact of a compromised ZSK, a zone administrator should set a signature validity period of 1 week for RRSIGs covering the DNSKEY RRSet in the zone (the RRSet that contains the ZSK and KSK for the zone). The DNSKEY RRSet can be re-signed without performing a ZSK rollover, but scheduled ZSK rollover should still be performed at regular intervals.

Description

The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs in the zone and in the parent zone. This strategy limits the time during which an attacker can take advantage of a compromised key to forge responses. An attacker that has compromised a ZSK can use that key only during the KSK's signature validity interval. An attacker that has compromised a KSK can use that key for only as long as the signature interval of the RRSIG covering the DS RR in the delegating parent. These validity periods should be short, which will require frequent re-signing. To minimize the impact of a compromised ZSK, a zone administrator should set a signature validity period of 1 week for RRSIGs covering the DNSKEY RRSet in the zone (the RRSet that contains the ZSK and KSK for the zone). The DNSKEY RRSet can be re-signed without performing a ZSK rollover, but scheduled ZSK rollover should still be performed at regular intervals.

STIG	Date
Infoblox 7.x DNS Security Technical Implementation Guide	2017-04-05

Details

Check Text ( C-69135r1_chk )
Review the Infoblox DNSSEC configuration and validate the Zone-Signing Key (ZSK) validity period is configured for a range of no less than two days and no more than one week. Navigate to Data Management >> DNS >> Grid DNS Properties, toggle Advanced Mode and select the "DNSSEC" tab. Validate the ZSK "Signature Validity" is configured to a value between "2" and "7" days; otherwise, this is a finding. When complete, click "Cancel" to exit the "Properties" screen.

Check Text ( C-69135r1_chk )

Review the Infoblox DNSSEC configuration and validate the Zone-Signing Key (ZSK) validity period is configured for a range of no less than two days and no more than one week.

Navigate to Data Management >> DNS >> Grid DNS Properties, toggle Advanced Mode and select the "DNSSEC" tab.

Validate the ZSK "Signature Validity" is configured to a value between "2" and "7" days; otherwise, this is a finding.

When complete, click "Cancel" to exit the "Properties" screen.

Fix Text (F-74717r1_fix)
Navigate to Data Management >> DNS >> Grid DNS Properties. Toggle Advanced Mode and select the "DNSSEC" tab. Modify the Zone-Signing Key (ZSK) "Signature Validity" to a period between "2" and "7" days. When complete, click "Save & Close" to save the changes and exit the "Properties" screen. Perform a service restart if necessary.