---
title: "CVE-2016-1567\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-2016-1567?format=md
keywords: index, follow
---

# CVE-2016-1567

Publication date 26 January 2016

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2016-1567?format=md#impact-score)

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## Description

chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations
of symmetric keys when authenticating packets, which might allow remote
attackers to conduct impersonation attacks via an arbitrary trusted key,
aka a "skeleton key."

### From the Ubuntu Security Team

Matt Street discovered that chrony doesn't verify peer associations of
symmetric keys. A remote attacker could use this vulnerability impersonate
another user.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| chrony | 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Ignored end of life |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Fixed 2.1.1-1ubuntu0.1 |
| 15.10 wily | Ignored end of life |
| 15.04 vivid | Ignored end of life |
| 14.04 LTS trusty | Fixed 1.29-1ubuntu0.1 |
| 12.04 LTS precise | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2016-1567?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| chrony | * Upstream:   [?id=a78](https://git.tuxfamily.org/chrony/chrony.git/commit/?id=a78bf9725a7b481) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.1 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1567)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-1567)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-1567)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-1567)

### Other references

* <http://www.talosintel.com/reports/TALOS-2016-0071/>
* <http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175969.html>
* <http://chrony.tuxfamily.org/news.html#_20_jan_2016_chrony_2_2_1_and_chrony_1_31_2_released>
* <https://www.cve.org/CVERecord?id=CVE-2016-1567>