firefox vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

* Ubuntu 20.04 LTS
* Ubuntu 19.10
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS

Summary

A X-Frame-Options bypass was discovered in Firefox.

Software Description

* firefox - Mozilla Open Source web browser

Details

It was discovered that X-Frame-Options could be bypassed in some
circumstances. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this to
conduct clickjacking attacks.

Update instructions

The problem can be corrected by updating your system to the
following package versions:

Ubuntu 20.04 LTS
firefox - 78.0.2+build2-0ubuntu0.20.04.1

Ubuntu 19.10
firefox - 78.0.2+build2-0ubuntu0.19.10.1

Ubuntu 18.04 LTS
firefox - 78.0.2+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS
firefox - 78.0.2+build2-0ubuntu0.16.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart Firefox to make
all the necessary changes.

References

* LP: 1887576

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