---
title: "CVE-2018-5741\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2018-5741?format=md
keywords: index, follow
---

# CVE-2018-5741

Publication date 16 January 2019

Last updated 25 August 2025

---

Ubuntu priority

**Negligible**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-5741?format=md#impact-score)

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## Description

To provide fine-grained controls over the ability to use Dynamic DNS (DDNS)
to update records in a zone, BIND 9 provides a feature called
update-policy. Various rules can be configured to limit the types of
updates that can be performed by a client, depending on the key used when
sending the update request. Unfortunately, some rule types were not
initially documented, and when documentation for them was added to the
Administrator Reference Manual (ARM) in change #3112, the language that was
added to the ARM at that time incorrectly described the behavior of two
rule types, krb5-subdomain and ms-subdomain. This incorrect documentation
could mislead operators into believing that policies they had configured
were more restrictive than they actually were. This affects BIND versions
prior to BIND 9.11.5 and BIND 9.12.3.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2018-5741?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| bind9 | 19.04 disco | Fixed 1:9.11.5.P1+dfsg-1ubuntu2 |
| 18.10 cosmic | Ignored |
| 18.04 LTS bionic | Ignored |
| 16.04 LTS xenial | Ignored |
| 14.04 LTS trusty | Ignored |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

per the ISC advisory: "At the present time, ISC is not providing
any code changing the behavior of the update-policy feature."
deferring for now to see if the policy will change
documentation changes went into 9.11.5
we will not be changing the documentation in our stable releases

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | High |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5741)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-5741)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-5741)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-5741)

### Other references

* <https://kb.isc.org/docs/cve-2018-5741>
* <https://www.cve.org/CVERecord?id=CVE-2018-5741>