RedHat: RHSA-2021-4123:01 Important: firefox security update
Summary
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.
Summary
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.
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
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/
Topic
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 impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
Bugs Fixed
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
