Vulnerability Description
By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 63.0 |
| Mozilla | Firefox Esr | < 60.3 |
| Debian | Debian Linux | 8.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Redhat | Enterprise Linux Desktop | 6.0 |
| Redhat | Enterprise Linux Server | 6.0 |
| Redhat | Enterprise Linux Server Eus | 7.5 |
| Redhat | Enterprise Linux Workstation | 6.0 |
References
- http://www.securityfocus.com/bid/105718Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041944Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:3005Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3006Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1467523Issue TrackingPermissions RequiredVendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/11/msg00008.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/201811-04Third Party Advisory
- https://usn.ubuntu.com/3801-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4324Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-27/Vendor Advisory
- http://www.securityfocus.com/bid/105718Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041944Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:3005Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3006Third Party Advisory
FAQ
What is CVE-2018-12395?
CVE-2018-12395 is a vulnerability with a CVSS score of 7.5 (HIGH). By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are ot...
How severe is CVE-2018-12395?
CVE-2018-12395 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-2018-12395?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Debian Debian Linux, Canonical Ubuntu Linux, Redhat Enterprise Linux Desktop.