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II - Mission Support Public

Rules and Groups employed by this XCCDF Profile

  • A BIND 9.x master name server must limit the number of concurrent zone transfers between authorized secondary name servers.

    Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation. Name servers do not have direct user connections but accept client connections for...
    Rule Medium Severity
  • SRG-APP-000246-DNS-000035

    Group
  • A BIND 9.x implementation configured as a caching name server must restrict recursive queries to only the IP addresses and IP address ranges of known supported clients.

    Any host that can query a resolving name server has the potential to poison the servers name cache or take advantage of other vulnerabilities that may be accessed through the query service. The bes...
    Rule Medium Severity
  • SRG-APP-000158-DNS-000015

    Group
  • The BIND 9.x server implementation must uniquely identify and authenticate the other DNS server before responding to a server-to-server transaction, zone transfer and/or dynamic update request using cryptographically based bidirectional authentication to protect the integrity of the information in transit.

    Server-to-server (zone transfer) transactions are provided by TSIG, which enforces mutual server authentication using a key that is unique to each server pair (TSIG), thus uniquely identifying the ...
    Rule High Severity

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