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USN-4474-1: Firefox vulnerabilities

26 August 2020

Firefox could be made to crash or run programs as your login if it opened a malicious website.



  • firefox - Mozilla Open Source web browser


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, trick the user
in to installing a malicious extension, spoof the URL bar, leak sensitive
information between origins, or execute arbitrary code. (CVE-2020-15664,
CVE-2020-15665, CVE-2020-15666, CVE-2020-15670)

It was discovered that NSS incorrectly handled certain signatures.
An attacker could possibly use this issue to expose sensitive information.
(CVE-2020-12400, CVE-2020-12401, CVE-2020-6829)

A data race was discovered when importing certificate information in to
the trust store. An attacker could potentially exploit this to cause an
unspecified impact. (CVE-2020-15668)

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

  • USN-4455-1: nss, libnss3-tools, libnss3-dev, libnss3, libnss3-1d, libnss3-nssdb