Security Vulnerabilities fixed in firefox RHSA-2021:4123

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) 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. SolutionFor 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 Applications

firefox

CVE References

CVE-2021-38509 CVE-2021-38508 CVE-2021-38503 CVE-2021-38507 CVE-2021-38506 CVE-2021-38504

Other References

https://access.redhat.com/errata/RHSA-2021:4123