CVE-2018-12395

HIGH

Firefox < 63.0 and Firefox ESR < 60.3 - Domain Restriction Bypass via Host Header Rewriting

Title source: llm
STIX 2.1

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.

References (11)

Core 11
Core References
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2018/dsa-4324
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2018-26/
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/201811-04
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2018-27/
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2018:3005
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/105718
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2018:3006
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/3801-1/
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1041944
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_confirm
https://bugzilla.mozilla.org/show_bug.cgi?id=1467523

Scores

CVSS v3 7.5
EPSS 0.0292
EPSS Percentile 86.6%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

Status published
Products (15)
canonical/ubuntu_linux 14.04
canonical/ubuntu_linux 16.04
canonical/ubuntu_linux 18.04
canonical/ubuntu_linux 18.10
debian/debian_linux 8.0
debian/debian_linux 9.0
mozilla/firefox < 63.0
mozilla/firefox_esr < 60.3
redhat/enterprise_linux_desktop 6.0
redhat/enterprise_linux_desktop 7.0
... and 5 more
Published Feb 28, 2019
Tracked Since Feb 18, 2026