USN-4717-2: Firefox regression

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• firefox - Mozilla Open Source web browser

Details

USN-4717-1 fixed vulnerabilities in Firefox. The update caused a
startup hang in some circumstances. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Multiple security issues were discovered in Firefox. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, conduct clickjacking attacks, or execute arbitrary code.

Update instructions

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

Ubuntu 20.10

• firefox - 85.0.1+build1-0ubuntu0.20.10.1

Ubuntu 20.04

• firefox - 85.0.1+build1-0ubuntu0.20.04.1

Ubuntu 18.04

• firefox - 85.0.1+build1-0ubuntu0.18.04.1

Ubuntu 16.04

• firefox - 85.0.1+build1-0ubuntu0.16.04.1

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

References

• https://launchpad.net/bugs/1914147