CVE-2017-7814

Publication date 2 October 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

File downloads encoded with "blob:" and "data:" URL elements bypassed normal file download checks though the Phishing and Malware Protection feature and its block lists of suspicious sites and files. This would allow malicious sites to lure users into downloading executables that would otherwise be detected as suspicious. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
firefox	18.04 LTS bionic	Fixed in 56.0+build6-0ubuntu1
	17.10 artful	Fixed in 56.0+build6-0ubuntu1
	17.04 zesty	Fixed in 56.0+build6-0ubuntu0.17.04.1
	16.04 LTS xenial	Fixed in 56.0+build6-0ubuntu0.16.04.1
	14.04 LTS trusty	Fixed in 56.0+build6-0ubuntu0.14.04.1
thunderbird	18.04 LTS bionic	Fixed in 1:52.4.0+build1-0ubuntu2
	17.10 artful	Fixed in 1:52.4.0+build1-0ubuntu2
	17.04 zesty	Fixed in 1:52.4.0+build1-0ubuntu0.17.04.2
	16.04 LTS xenial	Fixed in 1:52.4.0+build1-0ubuntu0.16.04.2
	14.04 LTS trusty	Fixed in 1:52.4.0+build1-0ubuntu0.14.04.2

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.8 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.8 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3436-1
Thunderbird vulnerabilities
11 October 2017

USN-3435-1
Firefox vulnerabilities
2 October 2017