---
title: "CVE-2017-7796\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-2017-7796?format=md
keywords: index, follow
---

# CVE-2017-7796

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

**4.7 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-7796?format=md#impact-score)

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## Description

On Windows systems, the logger run by the Windows updater deletes the file
"update.log" before it runs in order to write a new log of that name. The
path to this file is supplied at the command line to the updater and could
be used in concert with another local exploit to delete a different file
named "update.log" instead of the one intended. Note: This attack only
affects Windows operating systems. Other operating systems are not
affected. This vulnerability affects Firefox < 55.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-7796?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 17.04 zesty | 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**

4.7 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.7 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7796)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-7796)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-7796)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-7796)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2017-7796>