[USN-6509-2] Firefox regressions

[Evan Caville]

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Ubuntu Security Notice USN-6509-2
December 04, 2023

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

- Ubuntu 20.04 LTS

Summary:

USN-6509-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6509-1 fixed vulnerabilities in Firefox. The update introduced
several minor regressions. This update fixes the problem.

We apologize for the inconvenience.

Original advisory 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 across domains, or execute arbitrary code. (CVE-2023-6206,
 CVE-2023-6210, CVE-2023-6211, CVE-2023-6212, CVE-2023-6213)

 images were created on the canvas element. An attacker could potentially
 exploit this issue to obtain sensitive information. (CVE-2023-6204)

 MessagePort. An attacker could potentially exploit this issue to cause a
 denial of service. (CVE-2023-6205)

 in ReadableByteStreams. An attacker could potentially exploit this issue
 to cause a denial of service. (CVE-2023-6207)

 operations when using Selection API in X11. An attacker could potentially
 exploit this issue to obtain sensitive information. (CVE-2023-6208)

 URLS starting with "///". An attacker could potentially exploit this issue
 to cause a denial of service. (CVE-2023-6209)

Update instructions:

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

Ubuntu 20.04 LTS:
  firefox                         120.0.1+build1-0ubuntu0.20.04.1

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

References:
  https://ubuntu.com/security/notices/USN-6509-2
  https://ubuntu.com/security/notices/USN-6509-1
  https://launchpad.net/bugs/2045518

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/120.0.1+build1-0ubuntu0.20.04.1

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