Vulnerability CVE-2018-5738: Information
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.
Severity: HIGH (7.5) Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| bind | sisyphus | 9.11.4.P1-alt1 | 9.18.27-alt1 | ALT-PU-2018-2141-1 | 211328 | Fixed |
| bind | p10 | 9.11.4.P1-alt1 | 9.16.48-alt1 | ALT-PU-2018-2141-1 | 211328 | Fixed |
| bind | p9 | 9.11.4.P1-alt1 | 9.11.37-alt1 | ALT-PU-2018-2141-1 | 211328 | Fixed |
| bind | p8 | 9.10.8.P1-alt1 | 9.10.8.P1-alt4 | ALT-PU-2019-2541-1 | 236400 | Fixed |
| bind | c10f1 | 9.11.4.P1-alt1 | 9.16.48-alt0.c10f2.1 | ALT-PU-2018-2141-1 | 211328 | Fixed |
| bind | c9f2 | 9.11.4.P1-alt1 | 9.11.37-alt1 | ALT-PU-2018-2141-1 | 211328 | Fixed |
| bind | p11 | 9.11.4.P1-alt1 | 9.18.27-alt1 | ALT-PU-2018-2141-1 | 211328 | Fixed |
References to Advisories, Solutions, and Tools
Hyperlink | Resource |
|---|---|
| https://kb.isc.org/docs/aa-01616 |
|
| USN-3683-1 |
|
| 1041115 |
|
| GLSA-201903-13 |
|
| https://security.netapp.com/advisory/ntap-20190830-0002/ |