USN-5434-1: Firefox vulnerabilities

Publication date

23 May 2022

Overview

Firefox could be made to execute JavaScript in a privileged context if it opened a malicious website.


Packages

  • firefox - Mozilla Open Source web browser

Details

It was discovered that the methods of an Array object could be corrupted
as a result of prototype pollution by sending a message to the parent
process. If a user were tricked into opening a specially crafted website,
an attacker could exploit this to execute JavaScript in a privileged
context.

It was discovered that the methods of an Array object could be corrupted
as a result of prototype pollution by sending a message to the parent
process. If a user were tricked into opening a specially crafted website,
an attacker could exploit this to execute JavaScript in a privileged
context.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
21.10 impish firefox –  100.0.2+build1-0ubuntu0.21.10.1
20.04 focal firefox –  100.0.2+build1-0ubuntu0.20.04.1
18.04 bionic firefox –  100.0.2+build1-0ubuntu0.18.04.1

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