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Ubuntu Security Notice USN-5321-1
March 10, 2022

firefox vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

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, spoof the browser
UI, bypass security restrictions, obtain sensitive information, or execute
arbitrary code. (CVE-2022-0843, CVE-2022-26381, CVE-2022-26382,
CVE-2022-26383, CVE-2022-26384, CVE-2022-26385)

A TOCTOU bug was discovered when verifying addon signatures during
install. A local attacker could potentially exploit this to trick a
user into installing an addon with an invalid signature.
(CVE-2022-26387)

Update instructions:

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

Ubuntu 21.10:
   firefox                         98.0+build3-0ubuntu0.21.10.2

Ubuntu 20.04 LTS:
   firefox                         98.0+build3-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
   firefox                         98.0+build3-0ubuntu0.18.04.2

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

References:
   https://ubuntu.com/security/notices/USN-5321-1
   CVE-2022-0843, CVE-2022-26381, CVE-2022-26382, CVE-2022-26383,
   CVE-2022-26384, CVE-2022-26385, CVE-2022-26387

Package Information:
   https://launchpad.net/ubuntu/+source/firefox/98.0+build3-0ubuntu0.21.10.2
   https://launchpad.net/ubuntu/+source/firefox/98.0+build3-0ubuntu0.20.04.2
   https://launchpad.net/ubuntu/+source/firefox/98.0+build3-0ubuntu0.18.04.2