Important: firefox security update

Topic

An update for firefox is now available for Red Hat Enterprise Linux 9.2 Extended Update Support.

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.

This update upgrades Firefox to version 115.6.0 ESR.

Security Fix(es):

• Mozilla: Heap-buffer-overflow affecting WebGL <code>DrawElementsInstanced</code> method with Mesa VM driver (CVE-2023-6856)
• Mozilla: Memory safety bugs fixed in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6 (CVE-2023-6864)
• Mozilla: Potential exposure of uninitialized data in <code>EncryptingOutputStream</code> (CVE-2023-6865)
• Mozilla: Symlinks may resolve to smaller than expected buffers (CVE-2023-6857)
• Mozilla: Heap buffer overflow in <code>nsTextFragment</code> (CVE-2023-6858)
• Mozilla: Use-after-free in PR_GetIdentitiesLayer (CVE-2023-6859)
• Mozilla: Potential sandbox escape due to <code>VideoBridge</code> lack of texture validation (CVE-2023-6860)
• Mozilla: Heap buffer overflow affected <code>nsWindow::PickerOpen(void)</code> in headless mode (CVE-2023-6861)
• Mozilla: Use-after-free in <code>nsDNSService</code> (CVE-2023-6862)
• Mozilla: Clickjacking permission prompts using the popup transition (CVE-2023-6867)
• Mozilla: Undefined behavior in <code>ShutdownObserver()</code> (CVE-2023-6863)

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

After installing the update, Firefox must be restarted for the changes to take effect.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.2 x86_64
• Red Hat Enterprise Linux Server - AUS 9.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.2 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.2 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.2 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.2 x86_64
• Red Hat Enterprise Linux Server for ARM 64 - 4 years of updates 9.2 aarch64
• Red Hat Enterprise Linux Server for IBM z Systems - 4 years of updates 9.2 s390x

Fixes

• BZ - 2255360 - CVE-2023-6856 Mozilla: Heap-buffer-overflow affecting WebGL <code>DrawElementsInstanced</code> method with Mesa VM driver
• BZ - 2255361 - CVE-2023-6865 Mozilla: Potential exposure of uninitialized data in <code>EncryptingOutputStream</code>
• BZ - 2255362 - CVE-2023-6857 Mozilla: Symlinks may resolve to smaller than expected buffers
• BZ - 2255363 - CVE-2023-6858 Mozilla: Heap buffer overflow in <code>nsTextFragment</code>
• BZ - 2255364 - CVE-2023-6859 Mozilla: Use-after-free in PR_GetIdentitiesLayer
• BZ - 2255365 - CVE-2023-6860 Mozilla: Potential sandbox escape due to <code>VideoBridge</code> lack of texture validation
• BZ - 2255366 - CVE-2023-6867 Mozilla: Clickjacking permission prompts using the popup transition
• BZ - 2255367 - CVE-2023-6861 Mozilla: Heap buffer overflow affected <code>nsWindow::PickerOpen(void)</code> in headless mode
• BZ - 2255368 - CVE-2023-6862 Mozilla: Use-after-free in <code>nsDNSService</code>
• BZ - 2255369 - CVE-2023-6863 Mozilla: Undefined behavior in <code>ShutdownObserver()</code>
• BZ - 2255370 - CVE-2023-6864 Mozilla: Memory safety bugs fixed in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6

CVEs

• CVE-2023-6856
• CVE-2023-6857
• CVE-2023-6858
• CVE-2023-6859
• CVE-2023-6860
• CVE-2023-6861
• CVE-2023-6862
• CVE-2023-6863
• CVE-2023-6864
• CVE-2023-6865
• CVE-2023-6867

References

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