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CVE Scan for minio/minio:RELEASE.2025-09-07T16-13-09Z-cpuv1

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1 Known Vulnerabilities in this Docker Image

0
Critical
1
High
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Medium
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Low
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Info/ Unspecified/ Unknown
CVE IDSeverityPackageAffected VersionFixed VersionCVSS Score
CVE-2025-62506highminio<0.0.0-20251015170045-c1a49490c78e0.0.0-20251015170045-c1a49490c78e8.1

Summary

A privilege escalation vulnerability allows service accounts and STS (Security Token Service) accounts with restricted session policies to bypass their inline policy restrictions when performing "own" account operations, specifically when creating new service accounts for the same user.

Details

The vulnerability exists in the IAM policy validation logic in cmd/iam.go. When validating session policies for restricted accounts performing operations on their own account (such as creating service accounts), the code incorrectly relied on the DenyOnly argument.

The DenyOnly flag is used to allow accounts to perform actions related to their own account by only checking if the action is explicitly denied. However, when a session policy (sub-policy) is present, the system should validate that the action is actually allowed by the session policy, not just that it isn't denied.

Attack Scenario

  1. An administrator creates a service account or STS account with a restricted inline policy (e.g., access only to bucket1 and bucket2)
  2. The restricted account attempts to create a new service account for itself without specifying any policy restrictions
  3. Due to the bypass, the new service account is created with full parent privileges instead of being restricted by the inline policy
  4. The attacker now has escalated privileges beyond the intended restrictions

Impact

Attack Complexity: LOW - Exploitation requires only valid credentials for a restricted service/STS account

Confidentiality: HIGH - Attackers can access buckets and objects beyond their intended restrictions

Integrity: HIGH - Attackers can modify, delete, or create objects outside their authorized scope

Availability: NONE - Does not directly impact service availability

Patches

Fixed in PR https://github.com/minio/minio/pull/21642 Commit: c1a49490c78e9c3ebcad86ba0662319138ace190

Install the release

go install -v github.com/minio/[email protected]

Workarounds

No workarounds available. You can upgrade to the latest version immediately.

Mitigation Steps

  1. Upgrade MinIO: Update to the latest version containing the fix
  2. Audit Service Accounts: Review all service accounts created by non-admin accounts
  3. Revoke Suspicious Accounts: Delete any service accounts that may have been created through exploitation
  4. Review Access Logs: Check for unauthorized access to sensitive buckets

Resources

Relevance:

The CVE-2025-62506 is relevant if the Minio instance is exposed to untrusted networks or handles sensitive data, as it could allow unauthorized access or data manipulation. It becomes critical in multi-tenant environments or when used as a backend for critical applications. Otherwise, in isolated or trusted setups, the impact may be minimal. (Note: Relevance analysis is automatically generated and may require verification.)

Package URL(s):

Severity Levels

Exploitation could lead to severe consequences, such as system compromise or data loss. Requires immediate attention.

Vulnerability could be exploited relatively easily and lead to significant impact. Requires prompt attention.

Exploitation is possible but might require specific conditions. Impact is moderate. Should be addressed in a timely manner.

Exploitation is difficult or impact is minimal. Address when convenient or as part of regular maintenance.

Severity is not determined, informational, or negligible. Review based on context.

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