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Ubuntu 21.04 USN-5074-1 Critical Security Alert: Firefox DoS Vulnerability

ubuntu
Calendar Grey September 9, 2021
Dist Ubuntu Esm H88
Serious flaws in Chrome may result in system failures or unapproved activities. Refresh installations for better protection.
Firefox could be made to crash or run programs as your login if it opened a malicious website.

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, bypass mixed

content blocking, or execute arbitrary code.

Topics%20covered

Topics Covered

security advisory denial of service critical firefox ubuntu

Update Instructions

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

Ubuntu 21.04:
  firefox                         92.0+build3-0ubuntu0.21.04.1

Ubuntu 20.04 LTS:
  firefox                         92.0+build3-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  firefox                         92.0+build3-0ubuntu0.18.04.1

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

References

https://ubuntu.com/security/notices/USN-5074-1

CVE-2021-38491, CVE-2021-38493, CVE-2021-38494

Severity
critical
Lowest
Low
Medium
High
Critical

September 09, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical firefox ubuntu

Package Information

https://launchpad.net/ubuntu/+source/firefox/92.0+build3-0ubuntu0.21.04.1
https://launchpad.net/ubuntu/+source/firefox/92.0+build3-0ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/firefox/92.0+build3-0ubuntu0.18.04.1

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