Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian | Debian Linux | 7.0 |
| Mozilla | Firefox | < 57.0.1 |
| Redhat | Enterprise Linux Desktop | 6.0 |
| Redhat | Enterprise Linux Server | 6.0 |
| Redhat | Enterprise Linux Server Aus | 7.4 |
| Redhat | Enterprise Linux Server Eus | 7.4 |
| Redhat | Enterprise Linux Workstation | 6.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/102039Issue TrackingThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/102112Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039954Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:3382Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1410106ExploitIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2017/12/msg00003.htmlThird Party Advisory
- https://www.debian.org/security/2017/dsa-4062Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-27/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-28/Vendor Advisory
- http://www.securityfocus.com/bid/102039Issue TrackingThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/102112Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039954Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:3382Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1410106ExploitIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2017/12/msg00003.htmlThird Party Advisory
FAQ
What is CVE-2017-7843?
CVE-2017-7843 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 an...
How severe is CVE-2017-7843?
CVE-2017-7843 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-7843?
Check the references section above for vendor advisories and patch information. Affected products include: Debian Debian Linux, Mozilla Firefox, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus.