National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-7764 Detail

Current 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.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 5.3 MEDIUM
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N (V3 legend)
Impact Score: 1.4
Exploitability Score: 3.9


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 5.0 MEDIUM
Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): Partial
Availability (A): None
Additional Information:
Allows unauthorized modification

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/99057 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1038689 Third Party Advisory VDB Entry
http://www.unicode.org/reports/tr31/tr31-26.html#Aspirational_Use_Scripts Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1440 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1561 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1364283 Exploit Issue Tracking Vendor Advisory
https://www.debian.org/security/2017/dsa-3881 Third Party Advisory
https://www.debian.org/security/2017/dsa-3918 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2017-15/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-16/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-17/ Vendor Advisory

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
54.0
 cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
52.2.0
 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
52.2.0

Configuration 2 ( hide )
 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-7764
NVD Published Date:
06/11/2018
NVD Last Modified:
08/13/2018