---
title: "CVE-2019-6465: Zone transfer controls for writable DLZ zones were not "
slug: "cve-2019-6465"
description: "CVE-2019-6465: Zone transfer controls for writable DLZ zones were not effective"
updated: 2019-02-21T22:41:52Z
published: 2019-02-21T22:41:54Z
---

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> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
> Use this file to discover all available pages before exploring further.

# CVE-2019-6465: Zone transfer controls for writable DLZ zones were not effective

**CVE:** [CVE-2019-6465](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6465)

**Document version:** 2.0

**Posting date:** 21 February 2019

**Program impacted:** [BIND](https://www.isc.org/downloads/bind)

**Versions affected:** BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P2, 9.12.0 -> 9.12.3-P2, and versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition.  Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected.  Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2019-6465.

**Severity:** Medium

**Exploitable:** Remotely

**Description:**

Controls for zone transfers may not be properly applied to Dynamically Loadable Zones (DLZs) if the zones are writable.

**Impact:** 

A client exercising this defect can request and receive a zone transfer of a DLZ even when not permitted to do so by the allow-transfer ACL.

**CVSS Score:** 5.3

**CVSS Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

**Workarounds:** 

None

**Active exploits:** 

None known. 

**Solution:** 

Upgrade to the patched release most closely related to your current version of BIND:

 *  BIND 9.11.5-P4
 *  BIND 9.12.3-P4

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

 *  BIND 9.11.5-S5

**Document revision history:** 

1.0 Early Notification, 28 January 2019
2.0 Public Disclosure, 21 February 2019

**Related documents:** 

See our [BIND 9 Security Vulnerability Matrix](https://kb.isc.org/docs/aa-00913) for a complete listing of security vulnerabilities and versions affected.

**Do you still have questions?** Questions regarding this advisory should go to [security-officer@isc.org](mailto:security-officer@isc.org). *To 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/](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/](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 [https://www.isc.org/downloads/](https://www.isc.org/downloads).)

**ISC Security Vulnerability Disclosure Policy:** 

Details of our current security advisory policy and practice can be found in the [ISC Software Defect and Security Vulnerability Disclosure Policy](https://kb.isc.org/docs/aa-00861).

This [Knowledgebase article](https://kb.isc.org/docs/cve-2019-6465) is the complete and official security advisory document.

**Legal Disclaimer:** 

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