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CVE-2018-5174

7.5 · HIGH

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.

Published Jun 11, 2018EPSS 1.85%

Overview

CVE-2018-5174 is a high-severity vulnerability. It was published on June 11, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/104136Refwww.securitytracker.com/id/1040896Refbugzilla.mozilla.org/show_bug.cgi?id=1447080Refwww.mozilla.org/security/advisories/mfsa2018-11/Refwww.mozilla.org/security/advisories/mfsa2018-12/Refwww.mozilla.org/security/advisories/mfsa2018-13/Refwww.securityfocus.com/bid/104136Refwww.securitytracker.com/id/1040896Refbugzilla.mozilla.org/show_bug.cgi?id=1447080Refwww.mozilla.org/security/advisories/mfsa2018-11/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-5174?

CVE-2018-5174 is a high-severity vulnerability. It was published on June 11, 2018 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2018-5174?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-5174?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-5174?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-5174 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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