5
CVSSv2

CVE-2018-5174

Published: 11/06/2018 Updated: 03/10/2019
CVSS v2 Base Score: 5 | Impact Score: 2.9 | Exploitability Score: 10
CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9
VMScore: 445
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N

Vulnerability Summary

In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" flag associated with downloaded files and will not show any UI. Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed to be opened because Windows won't prompt the user to ask what to do. Firefox incorrectly sets this flag when downloading files, leading to less secure behavior from SmartScreen. Note: this issue only affects Windows 10 users running the April 2018 update or later. It does not affect other Windows users or other operating systems. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

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Vendor Advisories

In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" flag associated with downloaded files and will not show any UI Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed t ...
Mozilla Foundation Security Advisory 2018-13 Security vulnerabilities fixed in Thunderbird 528 Announced May 18, 2018 Impact critical Products Thunderbird Fixed in Thunderbird 528 ...
Mozilla Foundation Security Advisory 2018-11 Security vulnerabilities fixed in Firefox 60 Announced May 9, 2018 Impact critical Products Firefox Fixed in Firefox 60 ...
Mozilla Foundation Security Advisory 2018-12 Security vulnerabilities fixed in Firefox ESR 528 Announced May 9, 2018 Impact critical Products Firefox ESR Fixed in Firefox ESR 528 ...