Bug 1589616 (CVE-2018-5738) - CVE-2018-5738 bind: Improper handling of configuration allows all clients to perform recursive queries
Summary: CVE-2018-5738 bind: Improper handling of configuration allows all clients to ...
Status: CLOSED NOTABUG
Alias: CVE-2018-5738
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20180612,repor...
Keywords: Security
Depends On: 1590578 1590579 1590580
Blocks: 1589617
TreeView+ depends on / blocked
 
Reported: 2018-06-11 01:13 UTC by Sam Fowler
Modified: 2019-06-10 10:28 UTC (History)
16 users (show)

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Clone Of:
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Last Closed: 2019-06-10 10:28:33 UTC


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Description Sam Fowler 2018-06-11 01:13:19 UTC
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 07:04:09 UTC
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 2018-06-13 00:17:55 UTC
External Reference:

https://kb.isc.org/article/AA-01616/0/CVE-2018-5738

Comment 7 Sam Fowler 2018-06-13 00:20:35 UTC
Acknowledgments:

Name: ISC

Comment 8 Sam Fowler 2018-06-13 00:21:56 UTC
Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1590580]


Created bind99 tracking bugs for this issue:

Affects: fedora-all [bug 1590579]


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