CVE-2017-7764 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Reference

http://www.securityfocus.com/bid/99057 http://www.securitytracker.com/id/1038689 http://www.unicode.org/reports/tr31/tr31-26.htmlAspirational_Use_Scripts https://access.redhat.com/errata/RHSA-2017:1440 https://access.redhat.com/errata/RHSA-2017:1561 https://bugzilla.mozilla.org/show_bug.cgi?id=1364283 https://www.debian.org/security/2017/dsa-3881 https://www.debian.org/security/2017/dsa-3918 https://www.mozilla.org/security/advisories/mfsa2017-15/ https://www.mozilla.org/security/advisories/mfsa2017-16/ https://www.mozilla.org/security/advisories/mfsa2017-17/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.3