CVE:                 CVE-2018-5744
Document version:    2.0
Posting date:        21 February 2019
Program impacted:    BIND
Versions affected:   BIND 9.10.7 -> 9.10.8-P1, 9.11.3 -> 9.11.5-P1,
                     9.12.0 -> 9.12.3-P1, and versions 9.10.7-S1 ->
9.11.5-S3
                     of BIND 9 Supported Preview Edition. Versions 9.13.0 ->
                     9.13.5-W1 of the 9.13 development branch are also
affected.
Severity:            High
Exploitable:         Remotely

Description:

   A failure to free memory can occur when processing messages
   having a specific combination of EDNS options.

Impact:

   By exploiting this condition, an attacker can potentially cause
   named's memory use to grow without bounds until all memory
   available to the process is exhausted. Typically a server process
   is limited as to the amount of memory it can use but if the named
   process is not limited by the operating system all free memory
   on the server could be exhausted.

CVSS Score:          7.5
CVSS Vector:         CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Workarounds:         None.
Active exploits:     None known.

Solution:

   Upgrade to a version of BIND containing a fix for the memory leak.

   +  BIND 9.11.5-P4
   +  BIND 9.12.3-P4

   BIND Supported Preview Edition is a special feature preview
   branch of BIND provided to eligible ISC support customers.

   +  BIND 9.11.5-S5

Acknowledgements:

   ISC would like to thank Toshifumi Sakaguchi for reporting this issue
to us.

Document revision history:

   1.0 Advance Notification, 16 January 2019
   2.0 Public Disclosure, 21 February 2019

Related documents:

   See our BIND 9 Security Vulnerability Matrix for a complete
   listing of security vulnerabilities and versions affected.

Do you still have questions? Questions regarding this advisory
should go to security-offi...@isc.org. To report a new issue, please
encrypt your message using security-offi...@isc.org's PGP key which
can be found here:

   https://www.isc.org/downloads/software-support-policy/openpgp-key/.

If you are unable to use encrypted email, you may also report new
issues at: https://www.isc.org/community/report-bug/.

Note:

   ISC patches only currently supported versions. When possible we
   indicate EOL versions affected. (For current information on which
   versions are actively supported, please see
https://www.isc.org/downloads/.)

ISC Security Vulnerability Disclosure Policy:

   Details of our current security advisory policy and practice can
   be found in the ISC Software Defect and Security Vulnerability
   Disclosure Policy.

Legal Disclaimer:

   Internet Systems Consortium (ISC) is providing this notice on
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   in this notice and none should be implied. ISC expressly excludes
   and disclaims any warranties regarding this notice or materials
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   use or reliance on this notice or materials referred to in this
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   time. A stand-alone copy or paraphrase of the text of this
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   Uncontrolled copies may lack important information, be out of
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