RHSA-2025:1066 - Security Advisory

Topic

An update for firefox is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

• firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7 (CVE-2025-1017)
• firefox: thunderbird: Use-after-free in Custom Highlight (CVE-2025-1010)
• firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7 (CVE-2025-1016)
• firefox: thunderbird: Potential opening of private browsing tabs in normal browsing windows (CVE-2025-1013)
• firefox: thunderbird: A bug in WebAssembly code generation could result in a crash (CVE-2025-1011)
• firefox: thunderbird: Use-after-free in XSLT (CVE-2025-1009)
• firefox: thunderbird: Certificate length was not properly checked (CVE-2025-1014)
• firefox: thunderbird: Use-after-free during concurrent delazification (CVE-2025-1012)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.6 x86_64
• Red Hat Enterprise Linux Server - AUS 9.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 s390x

Fixes

• BZ - 2343748 - CVE-2025-1017 firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7
• BZ - 2343750 - CVE-2025-1010 firefox: thunderbird: Use-after-free in Custom Highlight
• BZ - 2343752 - CVE-2025-1016 firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7
• BZ - 2343754 - CVE-2025-1013 firefox: thunderbird: Potential opening of private browsing tabs in normal browsing windows
• BZ - 2343756 - CVE-2025-1011 firefox: thunderbird: A bug in WebAssembly code generation could result in a crash
• BZ - 2343760 - CVE-2025-1009 firefox: thunderbird: Use-after-free in XSLT
• BZ - 2343764 - CVE-2025-1014 firefox: thunderbird: Certificate length was not properly checked
• BZ - 2343765 - CVE-2025-1012 firefox: thunderbird: Use-after-free during concurrent delazification

CVEs

• CVE-2025-1009
• CVE-2025-1010
• CVE-2025-1011
• CVE-2025-1012
• CVE-2025-1013
• CVE-2025-1014
• CVE-2025-1016
• CVE-2025-1017

References

• https://access.redhat.com/security/updates/classification/#important