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CVE-2017-7764

Published: 14 June 2017

Characters from the "Canadian Syllabics" unicode block can be mixed with characters from other unicode blocks in the addressbar instead of being rendered as their raw "punycode" form, allowing for domain name spoofing attacks through character confusion. The current Unicode standard allows characters from "Aspirational Use Scripts" such as Canadian Syllabics to be mixed with Latin characters in the "moderately restrictive" IDN profile. We have changed Firefox behavior to match the upcoming Unicode version 10.0 which removes this category and treats them as "Limited Use Scripts.". This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
upstream
Released (54.0)
xenial
Released (54.0+build3-0ubuntu0.16.04.1)
yakkety
Released (54.0+build3-0ubuntu0.16.10.1)
zesty
Released (54.0+build3-0ubuntu0.17.04.1)
trusty
Released (54.0+build3-0ubuntu0.14.04.1)
thunderbird
Launchpad, Ubuntu, Debian
upstream
Released (52.2.0)
xenial
Released (1:52.2.1+build1-0ubuntu0.16.04.1)
yakkety
Released (1:52.2.1+build1-0ubuntu0.16.10.1)
zesty
Released (1:52.2.1+build1-0ubuntu0.17.04.1)
trusty
Released (1:52.2.1+build1-0ubuntu0.14.04.1)

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N