Vulnerability in Mozilla Firefox
CVE-2018-12395
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.029 (86.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 8.0, 9.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Eus — versions 7.5
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
References
- www.debian.org/security/2018/dsa-4324 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2018-26/ (Vendor Advisory)
- security.gentoo.org/glsa/201811-04 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2018-27/ (Vendor Advisory)
- access.redhat.com/errata/RHSA-2018:3005 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/105718 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2018:3006 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3801-1/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/11/msg00008.html (mailing-list, Mailing List, Third Party Advisory)
- www.securitytracker.com/id/1041944 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2018-12395?
- CVE-2018-12395 is a high-severity vulnerability in Mozilla Firefox. CVSS score: 7.5/10. Published 2019-02-28.
- How severe is CVE-2018-12395?
- High severity. CVSS v3 base score is 7.5 out of 10.