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Exploited vulnerability · CISA KEV

Is CVE-2013-3900 exploited? Yes: in CISA KEV since 10 Jan 2022

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

Yes. CVE-2013-3900, Microsoft WinVerifyTrust function Remote Code Execution, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Jan 2022, 2952 days after it was published. It affects Microsoft WinVerifyTrust function. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 10 Jan 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity5.5CVSS 3.1 · medium
US federal due10 Jul 2022BOD 22-01 deadline

What it is

A remote code execution vulnerability exists in the way that the WinVerifyTrust function handles Windows Authenticode signature verification for PE files.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductWinVerifyTrust function
VulnerabilityMicrosoft WinVerifyTrust function Remote Code Execution
WeaknessCWE-20
Published11 Dec 2013
Added to KEV10 Jan 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for WinVerifyTrust function 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 11 Dec 2013.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

Questions

Is CVE-2013-3900 being exploited?

Yes. CISA added CVE-2013-3900 to the Known Exploited Vulnerabilities catalog on 10 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2013-3900 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-2013-3900?

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 WinVerifyTrust function 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 January 2022 · Microsoft scorecard · act-now radar.

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