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Ubuntu Security Notice USN-7263-1
February 11, 2025

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

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Firefox.

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, obtain sensitive
information across domains, or execute arbitrary code. (CVE-2025-1011,
CVE-2025-1013, CVE-2025-1014, CVE-2025-1016, CVE-2025-1017, CVE-2025-1018,
CVE-2025-1019, CVE-2025-1020)

Ivan Fratric discovered that Firefox did not properly handle XSLT data,
leading to a use-after-free vulnerability. An attacker could potentially
exploit this issue to cause a denial of service, or execute arbitrary code.
(CVE-2025-1009)

Atte Kettunen discovered that Firefox did not properly manage memory in
the Custom Highlight API, leading to a use-after-free vulnerability. An
attacker could potentially exploit this issue to cause a denial of service,
or execute arbitrary code. (CVE-2025-1010)

Nils Bars discovered that Firefox did not properly manage memory during
concurrent delazification, leading to a use-after-free vulnerability.
An attacker could potentially exploit this issue to cause a denial of
service, or execute arbitrary code. (CVE-2025-1012)

Update instructions:

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

Ubuntu 20.04 LTS
  firefox                         135.0+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-7263-1
  CVE-2025-1009, CVE-2025-1010, CVE-2025-1011, CVE-2025-1012,
  CVE-2025-1013, CVE-2025-1014, CVE-2025-1016, CVE-2025-1017,
  CVE-2025-1018, CVE-2025-1019, CVE-2025-1020

Package Information:
https://launchpad.net/ubuntu/+source/firefox/135.0+build2-0ubuntu0.20.04.1