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CVE-2017-7764

Publication date 14 June 2017

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

5.3 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
firefox 17.04 zesty
Fixed 54.0+build3-0ubuntu0.17.04.1
16.10 yakkety
Fixed 54.0+build3-0ubuntu0.16.10.1
16.04 LTS xenial
Fixed 54.0+build3-0ubuntu0.16.04.1
14.04 LTS trusty
Fixed 54.0+build3-0ubuntu0.14.04.1
thunderbird 17.04 zesty
Fixed 1:52.2.1+build1-0ubuntu0.17.04.1
16.10 yakkety
Fixed 1:52.2.1+build1-0ubuntu0.16.10.1
16.04 LTS xenial
Fixed 1:52.2.1+build1-0ubuntu0.16.04.1
14.04 LTS trusty
Fixed 1:52.2.1+build1-0ubuntu0.14.04.1

Severity score breakdown

Parameter Value
Base score 5.3 · Medium
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-3321-1
    • Thunderbird vulnerabilities
    • 5 July 2017

Other references