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Exploited vulnerability · CISA KEV

Is CVE-2024-29988 exploited? Yes: in CISA KEV since 30 Apr 2024

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

Yes. CVE-2024-29988, Microsoft SmartScreen Prompt Security Feature Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 30 Apr 2024, 21 days after it was published. It affects Microsoft SmartScreen Prompt. 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 · 30 Apr 2024
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.1 · high
US federal due21 May 2024BOD 22-01 deadline

What it is

Microsoft SmartScreen Prompt contains a security feature bypass vulnerability that allows an attacker to bypass the Mark of the Web (MotW) feature. This vulnerability can be chained with CVE-2023-38831 and CVE-2024-21412 to execute a malicious file.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductSmartScreen Prompt
VulnerabilityMicrosoft SmartScreen Prompt Security Feature Bypass Vulnerability
WeaknessCWE-693
Published9 Apr 2024
Added to KEV30 Apr 2024
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for SmartScreen Prompt 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 9 Apr 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

Questions

Is CVE-2024-29988 being exploited?

Yes. CISA added CVE-2024-29988 to the Known Exploited Vulnerabilities catalog on 30 Apr 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-29988 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-2024-29988?

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 SmartScreen Prompt 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 April 2024 · Microsoft scorecard · act-now radar.

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