USN-4423-1: Firefox vulnerability

Releases

• Ubuntu 20.04 LTS
• Ubuntu 19.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• 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

• firefox - 78.0.2+build2-0ubuntu0.20.04.1

Ubuntu 19.10

• firefox - 78.0.2+build2-0ubuntu0.19.10.1

Ubuntu 18.04

• firefox - 78.0.2+build2-0ubuntu0.18.04.1

Ubuntu 16.04

• firefox - 78.0.2+build2-0ubuntu0.16.04.1

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

References

• https://launchpad.net/bugs/1887576