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Date: Tue, 28 Jul 2015 23:52:53 -0400
From: Michael McNally <>
Subject: [BIND] CVE-2015-5477: An error in handling TKEY queries can cause
 named to exit with a REQUIRE assertion failure

A deliberately constructed packet can exploit an error in the
handling of queries for TKEY records, permitting denial of service.

CVE:                 CVE-2015-5477
Document Version:    1.0
Posting date:        28 July 2015
Program Impacted:    BIND
Versions affected:   9.1.0 -> 9.8.x, 9.9.0->9.9.7-P1, 9.10.0->9.10.2-P2
Severity:            Critical
Exploitable:         Remotely


   An error in the handling of TKEY queries can be exploited by an
   attacker for use as a denial-of-service vector, as a constructed
   packet can use the defect to trigger a REQUIRE assertion failure,
   causing BIND to exit.


   Both recursive and authoritative servers are vulnerable to this
   defect.  Additionally, exposure is not prevented by either ACLs
   or configuration options limiting or denying service because the
   exploitable code occurs early in the packet handling, before
   checks enforcing those boundaries.

   All versions of BIND 9 from BIND 9.1.0 (inclusive) through BIND
   9.9.7-P1 and BIND 9.10.2-P2 are vulnerable.

   Operators should take steps to upgrade to a patched version as
   soon as possible.

CVSS Score:          7.8

CVSS Vector:         (AV:N/AC:L/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.  These can be downloaded from

   +  BIND 9 version 9.9.7-P2
   +  BIND 9 version 9.10.2-P3


   ISC would like to thank Jonathan Foote for discovering and
   disclosing this vulnerability.

Document Revision History:

    1.0 Advance Notification - 21 July, 2015
    2.0 Public Disclosure - 28 July, 2015

Related Documents:

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

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Advance Security Notifications, please visit

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should go to  To report a new issue,
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   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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