CVE-2017-7764

NameCVE-2017-7764
DescriptionCharacters 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1007-1, DLA-991-1, DSA-3881-1, DSA-3918-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid105.0.1-1fixed
firefox-esr (PTS)buster91.12.0esr-1~deb10u1fixed
buster (security)102.3.0esr-1~deb10u2fixed
bullseye91.13.0esr-1~deb11u1fixed
bullseye (security)102.3.0esr-1~deb11u1fixed
bookworm, sid102.3.0esr-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)54.0-1
firefox-esrsourcewheezy52.2.0esr-1~deb7u1DLA-991-1
firefox-esrsourcejessie52.2.0esr-1~deb8u1DSA-3881-1
firefox-esrsourcestretch52.2.0esr-1~deb9u1DSA-3881-1
firefox-esrsource(unstable)52.2.0esr-1
icedovesourcewheezy1:52.2.1-1~deb7u1DLA-1007-1
icedovesourcejessie1:52.2.1-4~deb8u1DSA-3918-1
icedovesourcestretch1:52.2.1-4~deb9u1DSA-3918-1
icedovesource(unstable)1:52.2.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2017-15/#CVE-2017-7764
https://www.mozilla.org/en-US/security/advisories/mfsa2017-16/#CVE-2017-7764
https://www.mozilla.org/en-US/security/advisories/mfsa2017-17/#CVE-2017-7764

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