Ubuntu 20.10 USN-4893-1 Critical: Firefox Crash and Execution Risks

ubuntu

March 25, 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, obtain sensitive

information, or execute arbitrary code. (CVE-2021-23981, CVE-2021-23982,

CVE-2021-23983, CVE-2021-23987, CVE-2021-23988)

It was discovered that extensions could open popup windows with control

of the window title in some circumstances. If a user were tricked into

installing a specially crafted extension, an attacker could potentially

exploit this to spook a website and trick the user into providing

credentials. (CVE-2021-23984)

It was discovered that the DevTools remote debugging feature could be

enabled without an indication to the user. If a local attacker could

modify the browser ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical firefox ubuntu execution issue

Update Instructions

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

Ubuntu 20.10:
  firefox                         87.0+build3-0ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  firefox                         87.0+build3-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
  firefox                         87.0+build3-0ubuntu0.18.04.2

Ubuntu 16.04 LTS:
  firefox                         87.0+build3-0ubuntu0.16.04.2

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