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Ubuntu Security Notice USN-6267-3
August 21, 2023

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

- Ubuntu 20.04 LTS

Summary:

USN-6267-2 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-6267-1 fixed vulnerabilities and USN-6267-2 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-2023-4047,
 CVE-2023-4048, CVE-2023-4049, CVE-2023-4051, CVE-2023-4053, CVE-2023-4055,
 CVE-2023-4056, CVE-2023-4057, CVE-2023-4058)
 
 Max Vlasov discovered that Firefox Offscreen Canvas did not properly track
 cross-origin tainting. An attacker could potentially exploit this issue to
 access image data from another site in violation of same-origin policy.
 (CVE-2023-4045)
 
 Alexander Guryanov discovered that Firefox did not properly update the
 value of a global variable in WASM JIT analysis in some circumstances. An
 attacker could potentially exploit this issue to cause a denial of service.
 (CVE-2023-4046)
 
 Mark Brand discovered that Firefox did not properly validate the size of
 an untrusted input stream. An attacker could potentially exploit this issue
 to cause a denial of service. (CVE-2023-4050)

Update instructions:

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

Ubuntu 20.04 LTS:
  firefox                         116.0.3+build2-0ubuntu0.20.04.1

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

References:
  https://ubuntu.com/security/notices/USN-6267-3
  https://ubuntu.com/security/notices/USN-6267-1
  https://launchpad.net/bugs/2032143

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/116.0.3+build2-0ubuntu0.20.04.1