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CVE-2023-28434: MinIO Security Feature Bypass Vulnerability

criticalknown exploitedpublic exploitCVE-2023-28434
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: MinIOproduct: MinIOPrivilege escalation
What
A security feature bypass vulnerability allows unauthorized object uploads to any bucket.
Who is affected
Users with credentials that have `arn:aws:s3:::*` permission and Console API access are affected.
Urgency
Remediation is critical due to active exploitation of this vulnerability.
Action
Users should update to the latest version of MinIO to mitigate this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-09-19
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-28434

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-28434coverage & exploitation statusNVD · CVE.org

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