Ubuntu Security Notice 4978-1 - 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, re-enable camera devices without an additional permission prompt, spoof the browser UI, or execute arbitrary code. It was discovered that filenames printed from private browsing mode were incorrectly retained in preferences. A local attacker could potentially exploit this to obtain sensitive information. Various other issues were also addressed.
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Ubuntu Security Notice USN-4978-1
June 02, 2021
firefox vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.10
- 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, re-enable
camera devices without an additional permission prompt, spoof the browser
UI, or execute arbitrary code. (CVE-2021-29959, CVE-2021-29961,
CVE-2021-29966, CVE-2021-29967)
It was discovered that filenames printed from private browsing mode were
incorrectly retained in preferences. A local attacker could potentially
exploit this to obtain sensitive information. (CVE-2021-29960)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
firefox 89.0+build2-0ubuntu0.21.04.1
Ubuntu 20.10:
firefox 89.0+build2-0ubuntu0.20.10.1
Ubuntu 20.04 LTS:
firefox 89.0+build2-0ubuntu0.20.04.2
Ubuntu 18.04 LTS:
firefox 89.0+build2-0ubuntu0.18.04.2
After a standard system update you need to restart Firefox to make
all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4978-1
CVE-2021-29959, CVE-2021-29960, CVE-2021-29961, CVE-2021-29966,
CVE-2021-29967
Package Information:
https://launchpad.net/ubuntu/+source/firefox/89.0+build2-0ubuntu0.21.04.1
https://launchpad.net/ubuntu/+source/firefox/89.0+build2-0ubuntu0.20.10.1
https://launchpad.net/ubuntu/+source/firefox/89.0+build2-0ubuntu0.20.04.2
https://launchpad.net/ubuntu/+source/firefox/89.0+build2-0ubuntu0.18.04.2