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CVE-2017-7843

Status Candidate

Overview

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.

Related Files

Debian Security Advisory 4062-1
Posted Dec 12, 2017
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4062-1 - It discovered that the Private Browsing mode in the Mozilla Firefox web browser allowed to fingerprint a user across multiple sessions via IndexedDB.

tags | advisory, web
systems | linux, debian
advisories | CVE-2017-7843
MD5 | 462098030c204e9dc5d68f345415d194
Red Hat Security Advisory 2017-3382-01
Posted Dec 4, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-3382-01 - Mozilla Firefox is an open source web browser. This update upgrades Firefox to version 52.5.1 ESR. Security Fix: A privacy flaw was discovered in Firefox. In Private Browsing mode, a web worker could write persistent data to IndexedDB, which was not cleared when exiting and would persist across multiple sessions. A malicious website could exploit the flaw to bypass private-browsing protections and uniquely fingerprint visitors.

tags | advisory, web
systems | linux, redhat
advisories | CVE-2017-7843
MD5 | 4f26deb40bfd00ea60b40d1a9254c77b
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