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CVE-2017-7764: Characters from the "Canadian Syllabics" unicode block can be mixed with characters from other unicode bloc...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2017-7764 is a browser address-bar spoofing issue. Older Mozilla clients could show lookalike internationalized domain names using Canadian Syllabics mixed with other scripts instead of showing punycode. This could make a malicious domain look like a trusted one and support phishing or credential theft. Exposure is mainly legacy installations of Firefox below 54, Firefox ESR below 52.2, and Thunderbird below 52.2, including distribution-packaged builds covered by Debian and Red Hat advisories. Treat this as a phishing-enablement risk for old Mozilla clients. It is not described as code execution, but obsolete browsers and mail clients should be removed or upgraded because users can be misled by trusted-looking domains. Mitigation focus: Upgrade Firefox to version 54 or later.; Upgrade Firefox ESR to version 52.2 or later.; Upgrade Thunderbird to version 52.2 or later..

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Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefoxunspecifiedListed
MozillaFirefox ESRunspecifiedListed
MozillaThunderbirdunspecifiedListed
Weakness

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