CVE-2017-7764
Publication date 14 June 2017
Last updated 24 July 2024
Ubuntu priority
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 | ||
| 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 | ||
| 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-3315-1
- Firefox vulnerabilities
- 15 June 2017
- USN-3321-1
- Thunderbird vulnerabilities
- 5 July 2017