USN-5186-1: Firefox vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• 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, obtain sensitive
information, conduct spoofing attacks, bypass CSP restrictions, or
execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546)

A security issue was discovered with the handling of WebExtension
permissions. If a user were tricked into installing a specially crafted
extension, an attacker could potentially exploit this to create and
install a service worker that wouldn't be uninstalled with the extension.
(CVE-2021-43540)

Update instructions

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

Ubuntu 21.10

• firefox - 95.0+build1-0ubuntu0.21.10.1

Ubuntu 21.04

• firefox - 95.0+build1-0ubuntu0.21.04.1

Ubuntu 20.04

• firefox - 95.0+build1-0ubuntu0.20.04.1

Ubuntu 18.04

• firefox - 95.0+build1-0ubuntu0.18.04.1

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

References

• CVE-2021-43538
• CVE-2021-43545
• CVE-2021-43540
• CVE-2021-43541
• CVE-2021-43536
• CVE-2021-43542
• CVE-2021-43537
• CVE-2021-43546
• CVE-2021-43543
• CVE-2021-43539

Related notices

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