CVE-2017-7843 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

http://www.securityfocus.com/bid/102039 http://www.securityfocus.com/bid/102112 http://www.securitytracker.com/id/1039954 https://access.redhat.com/errata/RHSA-2017:3382 https://bugzilla.mozilla.org/show_bug.cgi?id=1410106 https://lists.debian.org/debian-lts-announce/2017/12/msg00003.html https://www.debian.org/security/2017/dsa-4062 https://www.mozilla.org/security/advisories/mfsa2017-27/ https://www.mozilla.org/security/advisories/mfsa2017-28/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5