Improper input validation in Mozilla Firefox
CVE-2017-7764
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.020 (80.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Thunderbird — versions unspecified
- Debian Linux — versions 8.0, 9.0
Weakness classification (CWE)
References
- www.securityfocus.com/bid/99057 (VDB Entry, Third Party Advisory, vdb-entry)
- www.unicode.org/reports/tr31/tr31-26.html (Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2017-15/ (Vendor Advisory)
- www.debian.org/security/2017/dsa-3918 (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1038689 (VDB Entry, Third Party Advisory, vdb-entry)
- bugzilla.mozilla.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- www.debian.org/security/2017/dsa-3881 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2017:1440 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2017:1561 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2017-17/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-7764?
- CVE-2017-7764 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-06-11.
- How severe is CVE-2017-7764?
- Medium severity. CVSS v3 base score is 5.3 out of 10.