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Exploited vulnerability · CISA KEV

Is CVE-2024-38217 exploited? Yes: in CISA KEV since 10 Sep 2024

Gociux · Microsoft Windows · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-38217, Microsoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Sep 2024, the day it was published. It affects Microsoft Windows. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 10 Sep 2024
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity5.4CVSS 3.1 · medium
US federal due1 Oct 2024BOD 22-01 deadline

What it is

Microsoft Windows Mark of the Web (MOTW) contains a protection mechanism failure vulnerability that allows an attacker to bypass MOTW-based defenses. This can result in a limited loss of integrity and availability of security features such as Protected View in Microsoft Office, which rely on MOTW tagging.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductWindows
VulnerabilityMicrosoft Windows Mark of the Web (MOTW) Protection Mechanism Failure Vulnerability
WeaknessCWE-693
Published10 Sep 2024
Added to KEV10 Sep 2024
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Windows in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 10 Sep 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Windows

References

Questions

Is CVE-2024-38217 being exploited?

Yes. CISA added CVE-2024-38217 to the Known Exploited Vulnerabilities catalog on 10 Sep 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-38217 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-38217?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Windows and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2024 · Microsoft scorecard · act-now radar.

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