Title

The VMM must perform data integrity verification on the name/address resolution responses the system receives from authoritative sources. (Cat II impact)

Discussion

If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data integrity verification must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own, or has authenticated channels to trusted validation providers. VMMs that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. This is not applicable if DNSSEC is not implemented on the local network.

Check Content

Verify the VMM performs data integrity verification on the name/address resolution responses the system receives from authoritative sources. If it does not, this is a finding.

Fix Text

Configure the VMM to perform data integrity verification on the name/address resolution responses the system receives from authoritative sources.

Additional Identifiers

Rule ID: SV-207491r958864_rule

Vulnerability ID: V-207491

Group Title: SRG-OS-000401

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.