github - ghsa-jjjj-jwhf-8rgr

ghsa-jjjj-jwhf-8rgr

Vulnerability from github

Published

2025-10-16 21:36

Modified

2025-10-24 19:28

Severity ?

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Summary

MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS

Details

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

An administrator creates a service account or STS account with a restricted inline policy (e.g., access only to bucket1 and bucket2)
The restricted account attempts to create a new service account for itself without specifying any policy restrictions
Due to the bypass, the new service account is created with full parent privileges instead of being restricted by the inline policy
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/minio@RELEASE.2025-10-15T17-29-55Z

Workarounds

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

Mitigation Steps

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

Resources

Fix PR: https://github.com/minio/minio/pull/21642
Affected code: cmd/iam.go (functions: isAllowedBySessionPolicyForServiceAccount, isAllowedBySessionPolicy)

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/minio/minio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20251015170045-c1a49490c78e"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-62506"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-16T21:36:06Z",
    "nvd_published_at": "2025-10-16T22:15:31Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nA 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.\n\n### Details\nThe 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.\n\nThe `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\u0027t denied.\n\n### Attack Scenario\n  1. An administrator creates a service account or STS account with a restricted inline policy (e.g., access only to bucket1 and bucket2)\n  2. The restricted account attempts to create a new service account for itself without specifying any policy restrictions\n  3. Due to the bypass, the new service account is created with full parent privileges instead of being restricted by the inline policy\n  4. The attacker now has escalated privileges beyond the intended restrictions\n\n### Impact\n\n  **Attack Complexity**: LOW - Exploitation requires only valid credentials for a restricted service/STS account\n\n  **Confidentiality**: HIGH - Attackers can access buckets and objects beyond their intended restrictions\n\n  **Integrity**: HIGH - Attackers can modify, delete, or create objects outside their authorized scope\n\n  **Availability**: NONE - Does not directly impact service availability\n\n### Patches\nFixed in PR https://github.com/minio/minio/pull/21642\nCommit: c1a49490c78e9c3ebcad86ba0662319138ace190\n\nInstall the release\n```\ngo install -v github.com/minio/minio@RELEASE.2025-10-15T17-29-55Z\n```\n\n### Workarounds\nNo workarounds available. You can upgrade to the latest version immediately.\n\n### Mitigation Steps\n\n1. **Upgrade MinIO**: Update to the latest version containing the fix\n2. **Audit Service Accounts**: Review all service accounts created by non-admin accounts\n3. **Revoke Suspicious Accounts**: Delete any service accounts that may have been created through exploitation\n4. **Review Access Logs**: Check for unauthorized access to sensitive buckets\n\n### Resources\n\n- Fix PR: https://github.com/minio/minio/pull/21642\n- Affected code: cmd/iam.go (functions: isAllowedBySessionPolicyForServiceAccount, isAllowedBySessionPolicy)",
  "id": "GHSA-jjjj-jwhf-8rgr",
  "modified": "2025-10-24T19:28:23Z",
  "published": "2025-10-16T21:36:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/minio/minio/security/advisories/GHSA-jjjj-jwhf-8rgr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-62506"
    },
    {
      "type": "WEB",
      "url": "https://github.com/minio/minio/issues/21647"
    },
    {
      "type": "WEB",
      "url": "https://github.com/minio/minio/pull/21642"
    },
    {
      "type": "WEB",
      "url": "https://github.com/minio/minio/commit/c1a49490c78e9c3ebcad86ba0662319138ace190"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/minio/minio"
    },
    {
      "type": "WEB",
      "url": "https://github.com/minio/minio/discussions/21655"
    },
    {
      "type": "WEB",
      "url": "https://news.ycombinator.com/item?id=45684035"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS"
}

CVE-2025-62506 (GCVE-0-2025-62506)

Vulnerability from cvelistv5

Published

2025-10-16 21:17

Modified

2025-10-23 19:03

Severity ?

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-863 - Incorrect Authorization

Summary

MinIO is a high-performance object storage system. In all versions prior to RELEASE.2025-10-15T17-29-55Z, 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 operations on their own account, specifically when creating new service accounts for the same user. The vulnerability exists in the IAM policy validation logic where the code incorrectly relied on the DenyOnly argument when validating session policies for restricted accounts. When a session policy is present, the system should validate that the action is allowed by the session policy, not just that it is not denied. An attacker with valid credentials for a restricted service or STS account can create a new service account for itself without policy restrictions, resulting in a new service account with full parent privileges instead of being restricted by the inline policy. This allows the attacker to access buckets and objects beyond their intended restrictions and modify, delete, or create objects outside their authorized scope. The vulnerability is fixed in version RELEASE.2025-10-15T17-29-55Z.

References

URL

Tags

	https://github.com/minio/minio/security/advisories/GHSA-jjjj-jwhf-8rgr	x_refsource_CONFIRM
	https://github.com/minio/minio/pull/21642	x_refsource_MISC
	https://github.com/minio/minio/commit/c1a49490c78e9c3ebcad86ba0662319138ace190	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	minio	minio	Version: < RELEASE.2025-10-15T17-29-55Z

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

ghsa-jjjj-jwhf-8rgr

Vulnerability from github

Summary

Details

Attack Scenario

Impact

Patches

Workarounds

Mitigation Steps

Resources

CVE-2025-62506 (GCVE-0-2025-62506)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature