Information Exposure Affecting bind9 package, versions <1:9.11.3+dfsg-2
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Test your applications- Snyk ID SNYK-DEBIANUNSTABLE-BIND9-346617
- published 27 Jun 2018
- disclosed 16 Jan 2019
Introduced: 27 Jun 2018
CVE-2018-5738 Open this link in a new tabHow to fix?
Upgrade Debian:unstable
bind9
to version 1:9.11.3+dfsg-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream bind9
package and not the bind9
package as distributed by Debian
.
See How to fix?
for Debian:unstable
relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2018-5738
- https://kb.isc.org/docs/aa-01616
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5738
- https://security.gentoo.org/glsa/201903-13
- https://security.netapp.com/advisory/ntap-20190830-0002/
- http://www.securitytracker.com/id/1041115
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-5738
- https://usn.ubuntu.com/3683-1/