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Date: Tue, 15 Dec 2015 18:10:13 -0500
From: Michael McNally <>
Subject: CVE-2015-8461: A race condition when handling socket errors can lead
 to an assertion failure in resolver.c

CVE:                CVE-2015-8461
Document Version:   2.0
Posting date:       15 December 2015
Program Impacted:   BIND
Versions affected:  9.9.8 -> 9.9.8-P1, 9.9.8-S1 -> 9.9.8-S2, 9.10.3 ->
Severity:           Medium
Exploitable:        Remotely


   Beginning with the September 2015 maintenance releases 9.9.8 and
   9.10.3, an error was introduced into BIND 9 which can cause a
   server to exit after encountering an INSIST assertion failure
   in resolver.c


   An uncommonly occurring condition can cause affected servers to
   exit with an INSIST failure depending on the outcome of a race
   condition in resolver.c  While difficult to exploit reliably, a
   malicious party could, through deliberate behavior, significantly
   increase the probability of encountering the triggering condition,
   resulting in denial-of-service to clients if successful.

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:

Workarounds:        None.
Active exploits:    None known.


   Upgrade to the patched release most closely related to your
   current version of BIND. Public open-source branches can be
   downloaded from

     BIND 9 version 9.9.8-P2
     BIND 9 version 9.10.3-P2

   BIND 9 Supported Preview edition is a feature preview version
   of BIND provided exclusively to eligible ISC Support customers.

     BIND 9 version 9.9.8-S3


   ISC would like to thank John O'Brien of the University of
   Pennsylvania for discovering this issue.

Document Revision History:

   1.0 Advance Notification 8 December 2015
   2.0 Public Disclosure, 15 December 2015

Related Documents:

   See our BIND9 Security Vulnerability Matrix at for a complete listing of
   Security Vulnerabilities and versions affected.

If you'd like more information on ISC Subscription Support and
Advance Security Notifications, please visit

Do you still have questions?  Questions regarding this advisory
should go to  To report a new issue,
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If you are unable to use encrypted email, you may also report new
issues at:


   ISC patches only currently supported versions. When possible we
   indicate EOL versions affected.  (For current information on
   which versions are actively supported, please see

ISC Security Vulnerability Disclosure Policy:

   Details of our current security advisory policy and practice can
   be found here:

This Knowledge Base article is
the complete and official security advisory document.

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