Bug 1589616 (CVE-2018-5738)

Summary: CVE-2018-5738 bind: Improper handling of configuration allows all clients to perform recursive queries
Product: [Other] Security Response Reporter: Sam Fowler <sfowler>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abhgupta, anon.amish, dbaker, jokerman, jpopelka, mruprich, msehnout, pemensik, pzhukov, security-response-team, sthangav, thozza, trankin, vonsch, yozone, zdohnal
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,public=20180612,reported=20180611,source=upstream,cvss3=5.3/CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N,cwe=CWE-284,fedora-all/bind=affected,fedora-all/bind99=affected,rhel-8/bind=affected,rhel-7/bind=notaffected,rhel-6/bind=notaffected,rhel-5/bind=notaffected,rhel-5/bind97=notaffected,openshift-online-3/bind=notaffected
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On: 1590578, 1590579, 1590580    
Bug Blocks: 1589617    

Description Sam Fowler 2018-06-10 21:13:19 EDT
BIND was found to not properly handle certain configuration options, unintentionally permiting all clients to perform recursive queries. This occurs 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.

The permitting of recursive queries to unauthorized clients can allow for:
* Increase the load on a server, possibly degrading service to authorized clients.
* A server to being co-opted for use in DNS reflection attacks.
* An attacker may be able to deduce which queries a server has previously serviced by examining the results of queries answered from the cache, potentially leaking private information about what queries have been performed.

This affects the following versions:
* 9.9.12
* 9.10.7
* 9.11.3
* 9.12.0 to 9.12.1-P2
* 9.13.0
Comment 5 Tomas Hoger 2018-06-12 03:04:09 EDT
The flaw was introduced via the following upstream commit:

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=89636d8f305956ad42e95a988502c7345e85ffe1

This change has not yet been included in any bind in Red Hat Enterprise Linux.
Comment 6 Sam Fowler 2018-06-12 20:17:55 EDT
External Reference:

https://kb.isc.org/article/AA-01616/0/CVE-2018-5738
Comment 7 Sam Fowler 2018-06-12 20:20:35 EDT
Acknowledgments:

Name: ISC
Comment 8 Sam Fowler 2018-06-12 20:21:56 EDT
Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1590580]


Created bind99 tracking bugs for this issue:

Affects: fedora-all [bug 1590579]