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CVE-2017-7764

5.3 · MEDIUM

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…

Published Jun 11, 2018CWE-20EPSS 2.00%

Overview

CVE-2017-7764 is a medium-severity vulnerability. It was published on June 11, 2018 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/99057Refwww.securitytracker.com/id/1038689Refwww.unicode.org/reports/tr31/tr31-26.html#Aspirational_Use_ScriptsRefaccess.redhat.com/errata/RHSA-2017:1440Refaccess.redhat.com/errata/RHSA-2017:1561Refbugzilla.mozilla.org/show_bug.cgi?id=1364283Refwww.debian.org/security/2017/dsa-3881Refwww.debian.org/security/2017/dsa-3918Refwww.mozilla.org/security/advisories/mfsa2017-15/Refwww.mozilla.org/security/advisories/mfsa2017-16/

How CyberStrike helps

Frequently asked questions

What is CVE-2017-7764?

CVE-2017-7764 is a medium-severity vulnerability. It was published on June 11, 2018 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2017-7764?

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-7764?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-7764?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-7764 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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