CVE-2017-7843

moderate-risk

Published 2018-06-11

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.

Do I need to act?

1.1% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (13)

Debian Linux

Firefox

Enterprise Linux Desktop

Enterprise Linux Server

Enterprise Linux Server Aus

Enterprise Linux Server Eus

Enterprise Linux Workstation

Affected Vendors

Debian Redhat Mozilla

References (18)

Issue Tracking http://www.securityfocus.com/bid/102039

Third Party Advisory http://www.securityfocus.com/bid/102112

Third Party Advisory http://www.securitytracker.com/id/1039954

Third Party Advisory https://access.redhat.com/errata/RHSA-2017:3382

Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1410106

Third Party Advisory https://lists.debian.org/debian-lts-announce/2017/12/msg00003.html

Third Party Advisory https://www.debian.org/security/2017/dsa-4062

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-27/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-28/