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Exploited vulnerability · CISA KEV

Is CVE-2023-23376 exploited? Yes: in CISA KEV since 14 Feb 2023

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

Yes. CVE-2023-23376, Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 14 Feb 2023, the day it was published. It is known to be used in ransomware campaigns. It affects Microsoft Windows. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 14 Feb 2023
ransomwareKnownused in campaigns
EPSStop 5%very likely to be exploited
severity7.8CVSS 3.1 · high
US federal due7 Mar 2023BOD 22-01 deadline

What it is

Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductWindows
VulnerabilityMicrosoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability
WeaknessCWE-122
Published14 Feb 2023
Added to KEV14 Feb 2023
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 updates per vendor instructions.
  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 14 Feb 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Windows

References

Questions

Is CVE-2023-23376 being exploited?

Yes. CISA added CVE-2023-23376 to the Known Exploited Vulnerabilities catalog on 14 Feb 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-23376 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2023-23376?

Apply updates per vendor instructions. 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 February 2023 · Microsoft scorecard · act-now radar.

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