USN-4978-1: Firefox vulnerabilities

Releases

• Ubuntu 21.04
• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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)

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

• firefox - 89.0+build2-0ubuntu0.20.04.2

Ubuntu 18.04

• firefox - 89.0+build2-0ubuntu0.18.04.2

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

References

• CVE-2021-29960
• CVE-2021-29959
• CVE-2021-29961
• CVE-2021-29966
• CVE-2021-29967

Related notices

• USN-4995-1
• USN-4995-2