---
title: "CVE-2017-7768\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-2017-7768?format=md
keywords: index, follow
---

# CVE-2017-7768

Publication date 11 June 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-7768?format=md#impact-score)

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## Description

The Mozilla Maintenance Service can be invoked by an unprivileged user to
read 32 bytes of any arbitrary file on the local system by convincing the
service that it is reading a status file provided by the Mozilla Windows
Updater. The Mozilla Maintenance Service executes with privileged access,
bypassing system protections against unprivileged users. Note: This attack
requires local system access and only affects Windows. Other operating
systems are not affected. This vulnerability affects Firefox ESR < 52.2 and
Firefox < 54.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-7768?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |

---

* [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

---

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

Windows only

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7768)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-7768)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-7768)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-7768)

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2017-15/>
* <https://www.cve.org/CVERecord?id=CVE-2017-7768>