CVE-2017-3145: Improper sequencing during cleanup can lead to a
use-after-free error, triggering an assertion failure and crash in

CVE:               CVE-2017-3145
Document Version:  2.0
Posting date:      16 January 2018
Program Impacted:  BIND
Versions affected: 9.0.0 to 9.8.x, 9.9.0 to 9.9.11, 9.10.0 to 9.10.6,
                   9.11.0 to 9.11.2, 9.9.3-S1 to 9.9.11-S1,
                   9.10.5-S1 to 9.10.6-S1, 9.12.0a1 to 9.12.0rc1
Severity:          High
Exploitable:       Remotely


    BIND was improperly sequencing cleanup operations on upstream
    recursion fetch contexts, leading in some cases to a use-after-free
    error that can trigger an assertion failure and crash in named.


    While this bug has existed in BIND since 9.0.0, there are no known
    code paths leading to it in ISC releases prior to those containing
    the fix for CVE-2017-3137.  Thus while all instances of BIND ought
    to be patched, only ISC versions [9.9.9-P8 to 9.9.11, 9.10.4-P8 to
    9.10.6, 9.11.0-P5 to 9.11.2, 9.9.9-S10 to 9.9.11-S1, 9.10.5-S1 to
    9.10.6-S1, and 9.12.0a1 to 9.12.0rc1] acting as DNSSEC validating
    resolvers are currently known to crash due to this bug.  The known
    crash is an assertion failure in netaddr.c.

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:


    If an operator is experiencing crashes due to this, temporarily
    disabling DNSSEC validation can be used to avoid the known
    problematic code path while replacement builds are prepared.

Active exploits:

    No known active exploits but crashes due to this bug have been
    reported by multiple parties.


    Upgrade to the patched release most closely related to your current
    version of BIND.  These can all be downloaded from

    -  BIND 9 version 9.9.11-P1
    -  BIND 9 version 9.10.6-P1
    -  BIND 9 version 9.11.2-P1
    -  BIND 9 version 9.12.0rc2

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

    -  BIND 9 version 9.9.11-S2
    -  BIND 9 version 9.10.6-S2


    ISC would like to thank Jayachandran Palanisamy of Cygate AB for
    making us aware of this vulnerability.

Document Revision History:

    1.0 Advance Notification, 9 January 2018
    1.1 Packager Notification, added acknowledgement, 15 January 2018
    2.0 Public announcement, 16 January 2018

Related Documents:

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

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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
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