{ "containers": { "cna": { "affected": [ { "product": "Firefox", "vendor": "Mozilla", "versions": [ { "lessThan": "94", "status": "affected", "version": "unspecified", "versionType": "custom" } ] }, { "product": "Thunderbird", "vendor": "Mozilla", "versions": [ { "lessThan": "91.3", "status": "affected", "version": "unspecified", "versionType": "custom" } ] }, { "product": "Firefox ESR", "vendor": "Mozilla", "versions": [ { "lessThan": "91.3", "status": "affected", "version": "unspecified", "versionType": "custom" } ] } ], "descriptions": [ { "lang": "en", "value": "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." } ], "problemTypes": [ { "descriptions": [ { "description": "Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports", "lang": "en", "type": "text" } ] } ], "providerMetadata": { "dateUpdated": "2022-08-10T05:11:20", "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla" }, "references": [ { "tags": [ "x_refsource_MISC" ], "url": "https://www.mozilla.org/security/advisories/mfsa2021-49/" }, { "tags": [ "x_refsource_MISC" ], "url": "https://www.mozilla.org/security/advisories/mfsa2021-50/" }, { "tags": [ "x_refsource_MISC" ], "url": "https://www.mozilla.org/security/advisories/mfsa2021-48/" }, { "tags": [ "x_refsource_MISC" ], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1730935" }, { "name": "DSA-5026", "tags": [ "vendor-advisory", "x_refsource_DEBIAN" ], "url": "https://www.debian.org/security/2021/dsa-5026" }, { "name": "[debian-lts-announce] 20211229 [SECURITY] [DLA 2863-1] firefox-esr security update", "tags": [ "mailing-list", "x_refsource_MLIST" ], "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html" }, { "name": "DSA-5034", "tags": [ "vendor-advisory", "x_refsource_DEBIAN" ], "url": "https://www.debian.org/security/2022/dsa-5034" }, { "name": "[debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update", "tags": [ "mailing-list", "x_refsource_MLIST" ], "url": "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html" }, { "name": "GLSA-202202-03", "tags": [ "vendor-advisory", "x_refsource_GENTOO" ], "url": "https://security.gentoo.org/glsa/202202-03" }, { "name": "GLSA-202208-14", "tags": [ "vendor-advisory", "x_refsource_GENTOO" ], "url": "https://security.gentoo.org/glsa/202208-14" } ], "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security@mozilla.org", "ID": "CVE-2021-38507", "STATE": "PUBLIC" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "Firefox", "version": { "version_data": [ { "version_affected": "<", "version_value": "94" } ] } }, { "product_name": "Thunderbird", "version": { "version_data": [ { "version_affected": "<", "version_value": "91.3" } ] } }, { "product_name": "Firefox ESR", "version": { "version_data": [ { "version_affected": "<", "version_value": "91.3" } ] } } ] }, "vendor_name": "Mozilla" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "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." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports" } ] } ] }, "references": { "reference_data": [ { "name": "https://www.mozilla.org/security/advisories/mfsa2021-49/", "refsource": "MISC", "url": "https://www.mozilla.org/security/advisories/mfsa2021-49/" }, { "name": "https://www.mozilla.org/security/advisories/mfsa2021-50/", "refsource": "MISC", "url": "https://www.mozilla.org/security/advisories/mfsa2021-50/" }, { "name": "https://www.mozilla.org/security/advisories/mfsa2021-48/", "refsource": "MISC", "url": "https://www.mozilla.org/security/advisories/mfsa2021-48/" }, { "name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1730935", "refsource": "MISC", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1730935" }, { "name": "DSA-5026", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-5026" }, { "name": "[debian-lts-announce] 20211229 [SECURITY] [DLA 2863-1] firefox-esr security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html" }, { "name": "DSA-5034", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2022/dsa-5034" }, { "name": "[debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html" }, { "name": "GLSA-202202-03", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202202-03" }, { "name": "GLSA-202208-14", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202208-14" } ] } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T01:44:23.527Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://www.mozilla.org/security/advisories/mfsa2021-49/" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://www.mozilla.org/security/advisories/mfsa2021-50/" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://www.mozilla.org/security/advisories/mfsa2021-48/" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1730935" }, { "name": "DSA-5026", "tags": [ "vendor-advisory", "x_refsource_DEBIAN", "x_transferred" ], "url": "https://www.debian.org/security/2021/dsa-5026" }, { "name": "[debian-lts-announce] 20211229 [SECURITY] [DLA 2863-1] firefox-esr security update", "tags": [ "mailing-list", "x_refsource_MLIST", "x_transferred" ], "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html" }, { "name": "DSA-5034", "tags": [ "vendor-advisory", "x_refsource_DEBIAN", "x_transferred" ], "url": "https://www.debian.org/security/2022/dsa-5034" }, { "name": "[debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update", "tags": [ "mailing-list", "x_refsource_MLIST", "x_transferred" ], "url": "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html" }, { "name": "GLSA-202202-03", "tags": [ "vendor-advisory", "x_refsource_GENTOO", "x_transferred" ], "url": "https://security.gentoo.org/glsa/202202-03" }, { "name": "GLSA-202208-14", "tags": [ "vendor-advisory", "x_refsource_GENTOO", "x_transferred" ], "url": "https://security.gentoo.org/glsa/202208-14" } ] } ] }, "cveMetadata": { "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "assignerShortName": "mozilla", "cveId": "CVE-2021-38507", "datePublished": "2021-12-08T21:21:41", "dateReserved": "2021-08-10T00:00:00", "dateUpdated": "2024-08-04T01:44:23.527Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }