A Firefox regression update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

USN-6010-3: Firefox regressions

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Ubuntu Security Notice USN-6010-3
April 26, 2023

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

USN-6010-2 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6010-1 fixed vulnerabilities and USN-6010-2 fixed minor regressions 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-2023-29537,
CVE-2023-29540, CVE-2023-29543, CVE-2023-29544, CVE-2023-29547,
CVE-2023-29548, CVE-2023-29549, CVE-2023-29550, CVE-2023-29551)

Irvan Kurniawan discovered that Firefox did not properly manage fullscreen
notifications using a combination of window.open, fullscreen requests,
window.name assignments, and setInterval calls. An attacker could
potentially exploit this issue to perform spoofing attacks. (CVE-2023-29533)

Lukas Bernhard discovered that Firefox did not properly manage memory
when doing Garbage Collector compaction. An attacker could potentially
exploits this issue to cause a denial of service. (CVE-2023-29535)

Zx from qriousec discovered that Firefox did not properly validate the
address to free a pointer provided to the memory manager. An attacker could
potentially exploits this issue to cause a denial of service.
(CVE-2023-29536)

Alexis aka zoracon discovered that Firefox did not properly validate the
URI received by the WebExtension during a load request. An attacker could
potentially exploits this to obtain sensitive information. (CVE-2023-29538)

Trung Pham discovered that Firefox did not properly validate the filename
directive in the Content-Disposition header. An attacker could possibly
exploit this to perform reflected file download attacks potentially
tricking users to install malware. (CVE-2023-29539)

Ameen Basha M K discovered that Firefox did not properly validate downloads
of files ending in .desktop. An attacker could potentially exploits this
issue to execute arbitrary code. (CVE-2023-29541)

Update instructions:

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

Ubuntu 20.04 LTS:
firefox 112.0.2+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
firefox 112.0.2+build1-0ubuntu0.18.04.1

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

References:
  https://ubuntu.com/security/notices/USN-6010-3
  https://ubuntu.com/security/notices/USN-6010-1
  https://launchpad.net/bugs/2017722

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/112.0.2+build1-0ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/firefox/112.0.2+build1-0ubuntu0.18.04.1