High severity · published Feb 28, 2019
CVE-2018-12395
By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting
7.5
CVSS
2.9%
EPSS
No
On KEV
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 vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.9% · higher than 87% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 63 · source: vendor, NVD
FE
Firefox ESR · Mozilla
before 60.3 · source: vendor, NVD
DL
Debian Linux · Debian
8.0; 9.0 · source: NVD
EL
Enterprise Linux Desktop · Redhat
6.0; 7.0 · source: NVD
EL
Enterprise Linux Server · Redhat
6.0; 7.0 · source: NVD
EL
Enterprise Linux Server Eus · Redhat
7.5 · source: NVD
EL
Enterprise Linux Workstation · Redhat
6.0; 7.0 · source: NVD
UL
Ubuntu Linux · Canonical
14.04; 16.04; 18.04; 18.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-12395
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-12395
Third Party Advisory
http://www.securityfocus.com/bid/105718
Third Party Advisory
http://www.securitytracker.com/id/1041944
Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3005
Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3006
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1467523
Mailing List
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
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