Ubuntu 20.04: 4926-2 High: Firefox Security Vulnerability Alert

ubuntu

April 26, 2021

Firefox could be made to crash or run programs as your login if it opened a malicious website.

Summary

Firefox could be made to crash or run programs as your login if it

opened a malicious website.

Software Description:

- firefox: Mozilla Open Source web browser

Details:

Multiple security issues were discovered in Firefox. If a user were

tricked into opening a specially crafted website, an attacker could

potentially exploit these to cause a denial of service, spoof the

browser UI, bypass security restrictions, trick the user into disclosing

confidential information, or execute arbitrary code. (CVE-2021-23994,

CVE-2021-23996, CVE-2021-23997, CVE-2021-23998, CVE-2021-23999,

CVE-2021-24000, CVE-2021-24001, CVE-2021-29945, CVE-2021-29946,

CVE-2021-29947)

A use-after-free was discovered when Responsive Design Mode was

enabled. If a user were tricked into opening a specially crafted

website with Responsive Design Mode enabled, an attacker could

potentially exploit this to cause a denial of service, or execute

arbitrary code. (CVE-2021-23995)

It was discovered ...

Read the Full Advisory

Topics Covered

security advisory denial of service exploit moderate severity firefox ubuntu exploitation malicious website

Update Instructions

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

Ubuntu 20.04:
  firefox                         88.0+build2-0ubuntu0.21.04.1

Ubuntu 20.10:
  firefox                         88.0+build2-0ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  firefox                         88.0+build2-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  firefox                         88.0+build2-0ubuntu0.18.04.2

Ubuntu 16.04 LTS:
  firefox                         88.0+build2-0ubuntu0.16.04.1

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