Recursive DNS Server Detection

medium Nessus Network Monitor Plugin ID 3703


The remote name server allows recursive queries to be performed.


It is possible to query the remote nameserver for third party names. If this is your internal nameserver, then disregard this warning. If the host allows these recursive queries via UDP, then the host can be used to 'bounce' Denial of Service attacks against another network or system.


Restrict recursive queries to the hosts that should use this nameserver (such as those of the LAN connected to it). If you are using BIND 8, you can do this by using the instruction 'allow-recursion' in the 'options' section of your named.conf. If you are using BIND 9, you can define a grouping of internal addresses using the 'acl' command. Then, within the options block, you can explicitly state: 'allow-recursion { hosts_defined_in_acl }'. If you are using another name server, consult its documentation.

See Also

Plugin Details

Severity: Medium

ID: 3703

Family: DNS Servers

Published: 8/9/2006

Updated: 3/6/2019

Nessus ID: 10539

Risk Information


Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: E:U/RL:U/RC:C


Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: E:U/RL:U/RC:C

Reference Information

CVE: CVE-1999-0024

BID: 136, 678