Bug 987872 (CVE-2016-6172) - VUL-0: CVE-2016-6172: pdns: malicious primary DNS servers can crash secondaries
Summary: VUL-0: CVE-2016-6172: pdns: malicious primary DNS servers can crash secondaries
Status: RESOLVED FIXED
Alias: CVE-2016-6172
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other openSUSE 42.1
: P3 - Medium : Major
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
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Reported: 2016-07-06 12:33 UTC by Andreas Stieger
Modified: 2017-01-05 12:29 UTC (History)
3 users (show)

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Found By: Security Response Team
Services Priority:
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Marketing QA Status: ---
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Description Andreas Stieger 2016-07-06 12:33:40 UTC 
via oss-sec http://seclists.org/oss-sec/2016/q3/19

"most DNS server implementations do not implement reasonable restrictions for zone sizes. This allows an explicitly configured primary DNS server for a zone to crash a secondary DNS server, affecting service of other zones hosted on the same secondary server."

from https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html

> * [ For [LT] Secondary DNS Service ]
> 
>   See https://github.com/sischkg/xfer-limit
> 
>   Most of authoritative DNS server softwares do not have size limit of
>   zone transfer. He generated unlimited zone information at master
>   server, and transfered to slave servers. BIND 9, knot DNS and Power
>   DNS slave servers received unlimited zone informataion and died.
>   NSD slave DNS server received unlimited zone data and /tmp became full.
> 
>   He generated zone transfer size limit patch for BIND 9, Knot, NSD,
>   PowerDNS.

Third party patches at https://github.com/sischkg/xfer-limit

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-6172
http://seclists.org/oss-sec/2016/q3/20


openSUSE only.
Comment 1 Swamp Workflow Management 2016-07-06 22:00:50 UTC 
bugbot adjusting priority
Comment 2 Bernhard Wiedemann 2016-08-08 12:00:41 UTC 
This is an autogenerated message for OBS integration:
This bug (987872) was mentioned in
https://build.opensuse.org/request/show/417748 13.2+42.1 / pdns
Comment 3 Andreas Stieger 2016-08-11 19:19:01 UTC 
thanks
Comment 4 Swamp Workflow Management 2016-08-19 17:10:29 UTC 
openSUSE-SU-2016:2116-1: An update that fixes one vulnerability is now available.

Category: security (moderate)
Bug References: 987872
CVE References: CVE-2016-6172
Sources used:
openSUSE Leap 42.1 (src):    pdns-3.4.6-3.1
openSUSE 13.2 (src):    pdns-3.3.1-2.6.1
Comment 5 Andreas Stieger 2017-01-05 12:29:12 UTC 
all done, closing