Ubuntu 21.04 USN-4978-1 Moderate: Firefox Denial Of Service Exploits

ubuntu

June 2, 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, re-enable

camera devices without an additional permission prompt, spoof the browser

UI, or execute arbitrary code. (CVE-2021-29959, CVE-2021-29961,

CVE-2021-29966, CVE-2021-29967)

It was discovered that filenames printed from private browsing mode were

incorrectly retained in preferences. A local attacker could potentially

exploit this to obtain sensitive information. (CVE-2021-29960)

Topics Covered

security advisory denial of service security issue software update firefox ubuntu browser exploit

Update Instructions

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

Ubuntu 21.04:
  firefox                         89.0+build2-0ubuntu0.21.04.1

Ubuntu 20.10:
  firefox                         89.0+build2-0ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  firefox                         89.0+build2-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
  firefox                         89.0+build2-0ubuntu0.18.04.2

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