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Ubuntu Security Notice USN-6010-2
April 18, 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-6010-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6010-1 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-2023-29537,
 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                         112.0.1+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  firefox                         112.0.1+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-6010-2
  https://ubuntu.com/security/notices/USN-6010-1
  https://launchpad.net/bugs/2016835

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/112.0.1+build1-0ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/firefox/112.0.1+build1-0ubuntu0.18.04.1