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Exploited vulnerability · CISA KEV

Is CVE-2023-28434 exploited? Yes: in CISA KEV since 19 Sep 2023

Gociux · MinIO · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-28434, MinIO Security Feature Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 19 Sep 2023, 181 days after it was published. It affects MinIO. 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 · 19 Sep 2023
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity8.8CVSS 3.1 · high
US federal due10 Oct 2023BOD 22-01 deadline

What it is

MinIO contains a security feature bypass vulnerability that allows an attacker to use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket` to conduct privilege escalation. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access.

VendorMinIO (2 exploited CVEs in KEV)
ProductMinIO
VulnerabilityMinIO Security Feature Bypass Vulnerability
WeaknessCWE-269
Published22 Mar 2023
Added to KEV19 Sep 2023
Reported by (CNA)GitHub_M

What to do

  1. Check whether you run it. Look for MinIO in your asset inventory, including appliances and cloud images. Stack check lists every exploited MinIO 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 22 Mar 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for MinIO.

Other exploited CVEs in MinIO

References

Questions

Is CVE-2023-28434 being exploited?

Yes. CISA added CVE-2023-28434 to the Known Exploited Vulnerabilities catalog on 19 Sep 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-28434 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-2023-28434?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check MinIO's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected MinIO 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 2023 · MinIO scorecard · act-now radar.

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