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Use After Free Affecting firefox package, versions <55.0.2+build1-0ubuntu4

Severity

 Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
2.94% (87th percentile)

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  • Snyk IDSNYK-UBUNTU1804-FIREFOX-424370
  • published11 Jun 2018
  • disclosed11 Jun 2018
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Introduced: 11 Jun 2018

CVE-2017-7800  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 firefox to version 55.0.2+build1-0ubuntu4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.