Vulnerability Details : CVE-2018-5174
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.
Products affected by CVE-2018-5174
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird_esr:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-5174
0.55%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 75 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-5174
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST |
References for CVE-2018-5174
-
https://www.mozilla.org/security/advisories/mfsa2018-12/
Security vulnerabilities fixed in Firefox ESR 52.8 — MozillaVendor Advisory
-
http://www.securityfocus.com/bid/104136
Mozilla Firefox and Firefox ESR Multiple Security VulnerabilitiesThird Party Advisory;VDB Entry
-
https://www.mozilla.org/security/advisories/mfsa2018-13/
Security vulnerabilities fixed in Thunderbird 52.8 — MozillaVendor Advisory
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1447080
1447080 - (CVE-2018-5174) Security: SEE_MASK_FLAG_NO_UI behavior changes in Windows 10, allowing SmartScreen bypassIssue Tracking;Permissions Required;Third Party Advisory
-
http://www.securitytracker.com/id/1040896
Mozilla Firefox Multiple Bugs Let Remote Users Spoof Filenames, Bypass Security Restrictions, Obtain Potentially Sensitive Information, and Execute Arbitrary Code - SecurityTrackerThird Party Advisory;VDB Entry
-
https://www.mozilla.org/security/advisories/mfsa2018-11/
Security vulnerabilities fixed in Firefox 60 — MozillaVendor Advisory
Jump to