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{
"data_type" : "CVE" ,
"data_format" : "MITRE" ,
"data_version" : "4.0" ,
"CVE_data_meta" : {
"ID" : "CVE-2021-38507" ,
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"ASSIGNER" : "security@mozilla.org" ,
"STATE" : "PUBLIC"
} ,
"affects" : {
"vendor" : {
"vendor_data" : [
{
"vendor_name" : "Mozilla" ,
"product" : {
"product_data" : [
{
"product_name" : "Firefox" ,
"version" : {
"version_data" : [
{
"version_value" : "94" ,
"version_affected" : "<"
}
]
}
} ,
{
"product_name" : "Thunderbird" ,
"version" : {
"version_data" : [
{
"version_value" : "91.3" ,
"version_affected" : "<"
}
]
}
} ,
{
"product_name" : "Firefox ESR" ,
"version" : {
"version_data" : [
{
"version_value" : "91.3" ,
"version_affected" : "<"
}
]
}
}
]
}
}
]
}
} ,
"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" : [
{
"url" : "https://www.mozilla.org/security/advisories/mfsa2021-49/" ,
"refsource" : "MISC" ,
"name" : "https://www.mozilla.org/security/advisories/mfsa2021-49/"
} ,
{
"url" : "https://www.mozilla.org/security/advisories/mfsa2021-50/" ,
"refsource" : "MISC" ,
"name" : "https://www.mozilla.org/security/advisories/mfsa2021-50/"
} ,
{
"url" : "https://www.mozilla.org/security/advisories/mfsa2021-48/" ,
"refsource" : "MISC" ,
"name" : "https://www.mozilla.org/security/advisories/mfsa2021-48/"
} ,
{
"url" : "https://bugzilla.mozilla.org/show_bug.cgi?id=1730935" ,
"refsource" : "MISC" ,
"name" : "https://bugzilla.mozilla.org/show_bug.cgi?id=1730935"
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} ,
{
"refsource" : "DEBIAN" ,
"name" : "DSA-5026" ,
"url" : "https://www.debian.org/security/2021/dsa-5026"
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} ,
{
"refsource" : "MLIST" ,
"name" : "[debian-lts-announce] 20211229 [SECURITY] [DLA 2863-1] firefox-esr security update" ,
"url" : "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html"
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} ,
{
"refsource" : "DEBIAN" ,
"name" : "DSA-5034" ,
"url" : "https://www.debian.org/security/2022/dsa-5034"
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} ,
{
"refsource" : "MLIST" ,
"name" : "[debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update" ,
"url" : "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html"
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} ,
{
"refsource" : "GENTOO" ,
"name" : "GLSA-202202-03" ,
"url" : "https://security.gentoo.org/glsa/202202-03"
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}
]
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} ,
"description" : {
"description_data" : [
{
"lang" : "eng" ,
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"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."
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}
]
}
}
