CVE ID:	CVE-2018-5738
Description:	Change #4777 (introduced in October 2017) introduced an unforeseen issue in releases which were issued after that date, affecting which clients are permitted to make recursive queries to a BIND nameserver. The intended (and documented) behavior is that if an operator has not specified a value for the "allow-recursion" setting, it SHOULD default to one of the following: none, if "recursion no;" is set in named.conf; a value inherited from the "allow-query-cache" or "allow- query" settings IF "recursion yes;" (the default for that setting) AND match lists are explicitly set for "allow-query-cache" or "allow- query" (see the BIND9 Administrative Reference Manual section 6.2 for more details); or the intended default of "allow-recursion {localhost; localnets;};" if "recursion yes;" is in effect and no values are explicitly set for "allow-query-cache" or "allow-query". However, because of the regression introduced by change #4777, it is possible when "recursion yes;" is in effect and no match list values are provided for "allow-query-cache" or "allow-query" for the setting of "allow-recursion" to inherit a setting of all hosts from the "allow- query" setting default, improperly permitting recursion to all clients. Affects BIND 9.9.12, 9.10.7, 9.11.3, 9.12.0->9.12.1-P2, the development release 9.13.0, and also releases 9.9.12-S1, 9.10.7-S1, 9.11.3-S1, and 9.11.3-S2 from BIND 9 Supported Preview Edition.
Test IDs:	1.3.6.1.4.1.25623.1.0.141180   1.3.6.1.4.1.25623.1.0.874877   1.3.6.1.4.1.25623.1.0.843560   1.3.6.1.4.1.25623.1.0.874873   1.3.6.1.4.1.25623.1.0.141179   1.3.6.1.4.1.25623.1.0.874756   1.3.6.1.4.1.25623.1.1.13.2018.192.01
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2018-5738 https://security.gentoo.org/glsa/201903-13 http://www.securitytracker.com/id/1041115 https://usn.ubuntu.com/3683-1/