CVE-2017-3141: Windows service and uninstall paths are not quoted when BIND is installed

[Brian Conry]

CVE-2017-3141: Windows service and uninstall paths are not quoted when
BIND is installed, allowing for unintended programs to be run with
Administrator permissions under some circumstances.

CVE:               CVE-2017-3141
Document Version:  2.0
Posting date:      14 Jun 2017
Program Impacted:  BIND
Versions affected: 9.2.6-P2->9.2.9, 9.3.2-P1->9.3.6, 9.4.0->9.8.8,
                   9.9.0->9.9.10, 9.10.0->9.10.5, 9.11.0->9.11.1,
                   9.9.3-S1->9.9.10-S1, 9.10.5-S1
Severity:          Critical
Exploitable:       Locally

Description:

    The BIND installer on Windows uses an unquoted service path which
    can enable a local user to achieve privilege escalation if the host
    file system permissions allow this.

Impact:

    This vulnerability exists in the installer delivered with BIND for
    Windows and not within BIND itself.  Non-Windows builds and
    installations are unaffected.  A manual installation of BIND where
    the service path is quoted when added would not be at risk.

CVSS Score:   7.2
CVSS Vector:  CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/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:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

Workarounds:

    BIND installations on Windows are not at risk if the host file
    permissions prevent creation of a binary in a location where the
    service executor would run it instead of named.exe.

Active exploits:

    No known active exploits but this generic weakness is already a
    well-known attack vector if user file access permissions do not
    adequately prevent the installation of malicious executables.

Solution:

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

    - BIND 9 version 9.9.10-P1
    - BIND 9 version 9.10.5-P1
    - BIND 9 version 9.11.1-P1

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

    - BIND 9 version 9.9.10-S2
    - BIND 9 version 9.10.5-S2

Acknowledgements:

    ISC would like to thank John Page aka hyp3rlinx for reporting this
    issue.

Document Revision History:

    1.0 Advance Notification 6 June 2017
    1.1 Added acknowledgement 7 June 2017
    2.0 Public Announcement 14 June 2017

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.

    If you'd like more information on ISC Subscription Support and
    Advance Security Notifications, please visit
    http://www.isc.org/support/.

Do you still have questions?  Questions regarding this advisory should
go to security-officer at isc.org.  To report a new issue, please encrypt
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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
    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-01496 is the
complete and official security advisory document.

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