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CVE-2017-3141: Windows service and uninstall paths are not quoted when BIND is installed
Author: Cathy Almond Reference Number: AA-01496 Views: 57507 Created: 2017-06-14 20:00 Last Updated: 2017-06-14 20:18 0 Rating/ Voters

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@isc.orgTo report a new issue, please encrypt your message using security-officer@isc.org's PGP key which can be found here: 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-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html

This Knowledge Base article https://kb.isc.org/article/AA-01496 is the complete and official security advisory document.

Legal Disclaimer:

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