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Bug 1613595 - (CVE-2018-5740) CVE-2018-5740 bind: processing of certain records when "deny-answer-aliases" is in use may trigger an assert leading to a denial of service
CVE-2018-5740 bind: processing of certain records when "deny-answer-aliases" ...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20180808:2130...
: Security
Depends On: 1614042 1613976 1613977 1613978 1614040 1614041
Blocks: 1613599
  Show dependency tree / graph
 
Reported: 2018-08-07 20:29 EDT by Sam Fowler
Modified: 2018-11-05 18:15 EST (History)
20 users (show)

See Also:
Fixed In Version: bind 9.9.13-P1, bind 9.10.8-P1, bind 9.11.4-P1, bind 9.12.2-P1, bind 9.11.3-S3
Doc Type: If docs needed, set a value
Doc Text:
A denial of service flaw was discovered in bind versions that include the "deny-answer-aliases" feature. This flaw may allow a remote attacker to trigger an INSIST assert in named leading to termination of the process and a denial of service condition.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2570 None None None 2018-08-27 11:32 EDT
Red Hat Product Errata RHSA-2018:2571 None None None 2018-08-27 11:17 EDT

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Description Sam Fowler 2018-08-07 20:29:07 EDT 
BIND through versions 9.8.8, 9.9.13, 9.10.8, 9.11.4, 9.12.2 and 9.13.2 have a flaw in the "deny-answer-aliases" feature that can cause an INSIST assertion failure in named. A remote attacker could exploit this to cause named to crash.

Only servers which have explicitly enabled the "deny-answer-aliases" feature are at risk and disabling the feature prevents exploitation.
Comment 1 Sam Fowler 2018-08-07 20:29:13 EDT 
Acknowledgments:

Name: ISC
Upstream: Tony Finch (University of Cambridge)
Comment 2 Tomas Hoger 2018-08-08 03:11:36 EDT 
Note that upstream notes version 9.7.0 as the first version affected by this flaw, as that's when deny-answer-aliases feature was added.
Comment 9 Scott Gayou 2018-08-08 13:43:14 EDT 
Mitigation:

Disabling the "deny-answer-aliases" configuration option should prevent exploitation.
Comment 10 Scott Gayou 2018-08-08 13:54:11 EDT 
Statement:

The "deny-answer-aliases" configuration option is not enabled in default configurations of bind. Upstream states that this option is very rarely used. As such, if customers have not specifically enabled this option in configurations, the risk should be mitigated.
Comment 11 Scott Gayou 2018-08-08 17:31:22 EDT 
Unembargoing due to unembargo from upstream (https://lists.isc.org/pipermail/bind-announce/2018-August/001098.html)
Comment 12 Scott Gayou 2018-08-08 17:31:34 EDT 
External References:

https://kb.isc.org/article/AA-01639/74/CVE-2018-5740
Comment 13 Scott Gayou 2018-08-08 17:33:17 EDT 
Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1614040]


Created bind99 tracking bugs for this issue:

Affects: fedora-all [bug 1614041]
Comment 16 Doran Moppert 2018-08-10 02:18:31 EDT 
Red Hat Virtualization only ships client-side / library portions of bind, which do not include this flaw.
Comment 17 Doran Moppert 2018-08-10 02:24:44 EDT 
Upstream patches:

https://gitlab.isc.org/isc-projects/bind9/merge_requests/607/commits
Comment 21 errata-xmlrpc 2018-08-27 11:17:24 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:2571 https://access.redhat.com/errata/RHSA-2018:2571
Comment 22 errata-xmlrpc 2018-08-27 11:32:00 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2570 https://access.redhat.com/errata/RHSA-2018:2570
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