When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting. This vulnerability affects Firefox ESR < 52.5.2 and Firefox < 57.0.1.
[
{
"product": "Firefox ESR",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "52.5.2",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "57.0.1",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]
www.securityfocus.com/bid/102039
www.securityfocus.com/bid/102112
www.securitytracker.com/id/1039954
access.redhat.com/errata/RHSA-2017:3382
bugzilla.mozilla.org/show_bug.cgi?id=1410106
lists.debian.org/debian-lts-announce/2017/12/msg00003.html
www.debian.org/security/2017/dsa-4062
www.mozilla.org/security/advisories/mfsa2017-27/
www.mozilla.org/security/advisories/mfsa2017-28/