CVE-2015-8705: Problems converting OPT resource records and ECS options to text format can cause BIND to terminate.

[Michael McNally]

CVE:                   CVE-2015-8705
Document Version:      2.0
Posting date:          19 January 2016
Program Impacted:      BIND
Versions affected:     9.10.0->9.10.3-P2
Severity:              Medium
Exploitable:           Remotely

Description:

   In versions of BIND 9.10, errors can occur when OPT pseudo-RR
   data or ECS options are formatted to text.  In 9.10.3 through
   9.10.3-P2, the issue may result in a REQUIRE assertion failure
   in buffer.c. In prior 9.10 versions, it may result in named
   crashing (such as with a segmentation fault) or other misbehavior
   due to a buffer overrun.

Impact:

   This issue can affect both authoritative and recursive servers
   if they are performing debug logging. (It may also crash related
   tools which use the same code, such as dig or delv.)

CVSS Score:            5.4
CVSS Vector:           (AV:N/AC:H/Au:N/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:H/Au:N/C:N/I:N/A:C)

Workarounds:

   CVE-2015-8705 can be avoided in named by disabling debug logging.

Active exploits:

   No known active exploits.

Solution:

   Upgrade to the patched release most closely related to your
   current version of BIND.  This can be downloaded from
   http://www.isc.org/downloads.

   -  BIND 9 version 9.10.3-P3

Acknowledgements:

   ISC would like to thank Tatuya Jinmei of Infoblox for discovering
   and reporting one of the issues corrected in this fix.

Document Revision History:

   1.0 Advance Notification 12 January 2016
   1.1 "Versions affected", "Severity", "Description",
        and "Impact" information corrected. 15 January 2016
   2.0 Public disclosure 19 January 2016

Related Documents:

   See our BIND9 Security Vulnerability Matrix at
   https://kb.isc.org/article/AA-00913 for a complete listing of
   Security Vulnerabilities and versions affected.

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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
   http://www.isc.org/downloads/).

ISC Security Vulnerability Disclosure Policy:

   Details of our current security advisory policy and practice can
   be found here: https://kb.isc.org/article/AA-00861

This Knowledge Base article: https://kb.isc.org/article/AA-01336
is the complete and official security advisory document.

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