---
title: "CVE-2019-3870\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-2019-3870?format=md
keywords: index, follow
---

# CVE-2019-3870

Publication date 8 April 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.1 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-3870?format=md#impact-score)

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## Description

A vulnerability was found in Samba from version (including) 4.9 to versions
before 4.9.6 and 4.10.2. During the creation of a new Samba AD DC, files
are created in a private subdirectory of the install location. This
directory is typically mode 0700, that is owner (root) only access. However
in some upgraded installations it will have other permissions, such as
0755, because this was the default before Samba 4.8. Within this directory,
files are created with mode 0666, which is world-writable, including a
sample krb5.conf, and the list of DNS names and servicePrincipalName values
to update.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-3870?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| samba | 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [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)

4.9 and later only

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.1 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.1 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3870)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-3870)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-3870)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-3870)

### Other references

* <https://www.samba.org/samba/security/CVE-2019-3870.html>
* <https://www.cve.org/CVERecord?id=CVE-2019-3870>