The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded. This vulnerability affects Firefox < 68.
[
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "68",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]
lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
bugzilla.mozilla.org/show_bug.cgi?id=1552993
security.gentoo.org/glsa/201908-12
www.mozilla.org/security/advisories/mfsa2019-21/