Ubuntu Security Notice 4546-2 - USN-4546-1 fixed vulnerabilities in Firefox. The update introduced various minor regressions. This update fixes the problem. 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, conduct cross-site scripting attacks, spoof the site displayed in the download dialog, or execute arbitrary code. Various other issues were also addressed.
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Ubuntu Security Notice USN-4546-2
October 15, 2020
firefox regressions
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
USN-4546-1 caused some minor regressions in Firefox.
Software Description:
- firefox: Mozilla Open Source web browser
Details:
USN-4546-1 fixed vulnerabilities in Firefox. The update introduced various
minor regressions. This update fixes the problem.
We apologize for the inconvenience.
Original advisory 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, conduct cross-site
scripting (XSS) attacks, spoof the site displayed in the download dialog,
or execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
firefox 81.0.2+build1-0ubuntu0.20.04.1
Ubuntu 18.04 LTS:
firefox 81.0.2+build1-0ubuntu0.18.04.1
Ubuntu 16.04 LTS:
firefox 81.0.2+build1-0ubuntu0.16.04.1
After a standard system update you need to restart Firefox to make
all the necessary changes.
References:
https://usn.ubuntu.com/4546-2
https://usn.ubuntu.com/4546-1
https://launchpad.net/bugs/1900032
Package Information:
https://launchpad.net/ubuntu/+source/firefox/81.0.2+build1-0ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/firefox/81.0.2+build1-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/firefox/81.0.2+build1-0ubuntu0.16.04.1