-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: firefox security update Advisory ID: RHSA-2021:4123-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:4123 Issue date: 2021-11-03 CVE Names: CVE-2021-38503 CVE-2021-38504 CVE-2021-38506 CVE-2021-38507 CVE-2021-38508 CVE-2021-38509 ===================================================================== 1. Summary: An update for firefox is now available for Red Hat Enterprise Linux 8. 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. 2. Relevant releases/architectures: Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64 3. Description: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 91.3.0 ESR. Security Fix(es): * Mozilla: Use-after-free in HTTP2 Session object * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3 * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503) * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504) * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning (CVE-2021-38506) * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports (CVE-2021-38507) * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing (CVE-2021-38508) * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509) 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. 4. 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. 5. Bugs fixed (https://bugzilla.redhat.com/): 2019621 - CVE-2021-38503 Mozilla: iframe sandbox rules did not apply to XSLT stylesheets 2019622 - CVE-2021-38504 Mozilla: Use-after-free in file picker dialog 2019624 - CVE-2021-38506 Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning 2019625 - CVE-2021-38507 Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports 2019626 - Mozilla: Use-after-free in HTTP2 Session object 2019627 - CVE-2021-38508 Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing 2019628 - CVE-2021-38509 Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain 2019630 - Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3 6. Package List: Red Hat Enterprise Linux AppStream (v. 8): Source: firefox-91.3.0-1.el8_4.src.rpm aarch64: firefox-91.3.0-1.el8_4.aarch64.rpm firefox-debuginfo-91.3.0-1.el8_4.aarch64.rpm firefox-debugsource-91.3.0-1.el8_4.aarch64.rpm ppc64le: firefox-91.3.0-1.el8_4.ppc64le.rpm firefox-debuginfo-91.3.0-1.el8_4.ppc64le.rpm firefox-debugsource-91.3.0-1.el8_4.ppc64le.rpm s390x: firefox-91.3.0-1.el8_4.s390x.rpm firefox-debuginfo-91.3.0-1.el8_4.s390x.rpm firefox-debugsource-91.3.0-1.el8_4.s390x.rpm x86_64: firefox-91.3.0-1.el8_4.x86_64.rpm firefox-debuginfo-91.3.0-1.el8_4.x86_64.rpm firefox-debugsource-91.3.0-1.el8_4.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2021-38503 https://access.redhat.com/security/cve/CVE-2021-38504 https://access.redhat.com/security/cve/CVE-2021-38506 https://access.redhat.com/security/cve/CVE-2021-38507 https://access.redhat.com/security/cve/CVE-2021-38508 https://access.redhat.com/security/cve/CVE-2021-38509 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYYLmC9zjgjWX9erEAQje6Q/+JUKh34Ks9vFEMkIqA7bVe68+csbnvZXd 8HxQ4sn9/+ZkEpHD5eI0F6NOCqXS90NLFc2n8AzhEjyCVT//Vd0STkxULivKKkJ4 o0NAoO3KWxSa6rl9ub8TQO9z4T+tFT3cwQWBT88iZUVXNydqVi072s+dR/fpZaNk tkcMyua8FJsBEnZGAxSKDyVfLCpqXD3D4RMFpJOlmvZWMBDDHLhdvCqhMU9r2Eqa 2qi4TOUSyll8c/9TPoz6sRm8Lwl1zIIiwydhn26lXFZDbgiuBxvZfljWe5DWTZv2 k2HOCD6J+4L1Ho0LWgPEtsK40OnKczrK/vFXYy0Mhq5PuEir1pfI2IP/sBNS0sp5 QoAOExOID3Y1apv4BN3FRl3TGqsZMonPzEMnmrmyjk1G3HlXB0XrBk0dBvcPWHKB sTW6YWyCswjlefLjf2SFFwj67DizXf0rUOka0SW91huhroBfrNFv3VTgB/AfZtJt nOMl+hJwIjPUanb+qNaseq6r+E5fJCrZ51vByUSawKClrWSTu+uaqH9oyU2eyjMm nj1sj/U2sYX7u9cAlIYDZTXej0Y5pRuSOcxop89gaIf7SjbyRUeNA3vVKRygnvZY P2WLQ2AqDegwjltcu1rM5at6ZtwKwYMoM/M/9Lxq6G5llXbXhkRC2Ex7LiVq3RHy y/p82ZphIXs= =+cyX -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce