Gentoo Linux: CVE-2021-38507: Mozilla Firefox: Multiple vulnerabilities
Description
The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Solution(s)
- gentoo-linux-upgrade-mail-client-thunderbird
- gentoo-linux-upgrade-mail-client-thunderbird-bin
- gentoo-linux-upgrade-www-client-firefox
- gentoo-linux-upgrade-www-client-firefox-bin
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