Exploited vulnerability · CISA KEV

Is CVE-2023-28229 exploited? Yes: in CISA KEV since 4 Oct 2023

Gociux · Microsoft Windows CNG Key Isolation Service · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-28229, Microsoft Windows CNG Key Isolation Service Privilege Escalation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 4 Oct 2023, 176 days after it was published. It affects Microsoft Windows CNG Key Isolation Service. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it is

Microsoft Windows Cryptographic Next Generation (CNG) Key Isolation Service contains an unspecified vulnerability that allows an attacker to gain specific limited SYSTEM privileges.

What to do

1. Check whether you run it. Look for Windows CNG Key Isolation Service 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 11 Apr 2023.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28229
• nvd.nist.gov/vuln/detail/CVE-2023-28229

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 October 2023 · Microsoft scorecard · act-now radar.