USN-4443-1: Firefox vulnerabilities

Releases

• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• firefox - Mozilla Open Source web browser

Details

Multiple security issues were discovered in Firefox. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, bypass iframe sandbox restrictions, confuse the user, or
execute arbitrary code. (CVE-2020-6463, CVE-2020-6514, CVE-2020-15652,
CVE-2020-15653, CVE-2020-15654, CVE-2020-15656, CVE-2020-15658,
CVE-2020-15659)

It was discovered that redirected HTTP requests which are observed or
modified through a web extension could bypass existing CORS checks. If a
user were tricked in to installing a specially crafted extension, an
attacker could potentially exploit this to obtain sensitive information
across origins. (CVE-2020-15655)

Update instructions

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

Ubuntu 20.04

• firefox - 79.0+build1-0ubuntu0.20.04.1

Ubuntu 18.04

• firefox - 79.0+build1-0ubuntu0.18.04.1

Ubuntu 16.04

• firefox - 79.0+build1-0ubuntu0.16.04.2

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

References

• CVE-2020-15652
• CVE-2020-15653
• CVE-2020-15654
• CVE-2020-15658
• CVE-2020-15659
• CVE-2020-6463
• CVE-2020-15656
• CVE-2020-15655
• CVE-2020-6514