Add file upload WAF rules crs-944-140 and dog-920-100 to default config

Ports two new rules from DataDog/appsec-event-rules#277:
- crs-944-140: detects JSP/JSPX script file uploads via server.request.body.filenames and x-filename headers
- dog-920-100: detects double-extension file uploads (e.g. file.php.jpg)

Author: jandro996

dd-java-agent/appsec/src/main/resources/default_config.json

@@ -4528,6 +4528,61 @@
         "lowercase"
       ]
     },
+    {
+      "id": "crs-944-140",
+      "name": "Java Injection Attack: Java Script File Upload Found",
+      "tags": {
+        "type": "unrestricted_file_upload",
+        "crs_id": "944140",
+        "category": "attack_attempt",
+        "cwe": "434",
+        "capec": "1000/152/242",
+        "confidence": "1",
+        "module": "waf"
+      },
+      "conditions": [
+        {
+          "parameters": {
+            "inputs": [
+              {
+                "address": "server.request.body.filenames"
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x-filename"
+                ]
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x_filename"
+                ]
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x.filename"
+                ]
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x-file-name"
+                ]
+              }
+            ],
+            "regex": "\\.jspx?$",
+            "options": {
+              "case_sensitive": true,
+              "min_length": 5
+            }
+          },
+          "operator": "match_regex"
+        }
+      ],
+      "transformers": []
+    },
     {
       "id": "crs-944-260",
       "name": "Remote Command Execution: Malicious class-loading payload",
@@ -5457,6 +5512,60 @@
       ],
       "transformers": []
     },
+    {
+      "id": "dog-920-100",
+      "name": "File upload with double extension",
+      "tags": {
+        "type": "http_protocol_violation",
+        "category": "attack_attempt",
+        "cwe": "176",
+        "capec": "1000/255/153/267/71",
+        "confidence": "0",
+        "module": "waf"
+      },
+      "conditions": [
+        {
+          "parameters": {
+            "inputs": [
+              {
+                "address": "server.request.body.filenames"
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x-filename"
+                ]
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x_filename"
+                ]
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x.filename"
+                ]
+              },
+              {
+                "address": "server.request.headers.no_cookies",
+                "key_path": [
+                  "x-file-name"
+                ]
+              }
+            ],
+            "regex": "\\w\\.[a-zA-Z0-9]{2,5}\\.[a-zA-Z0-9]{2,5}$",
+            "options": {
+              "case_sensitive": true,
+              "min_length": 6
+            }
+          },
+          "operator": "match_regex"
+        }
+      ],
+      "transformers": []
+    },
     {
       "id": "dog-920-110",
       "name": "Zipslip Attack - Unsafe Zip extraction",

dd-smoke-tests/appsec/springboot/src/test/groovy/datadog/smoketest/appsec/SpringBootSmokeTest.groovy

@@ -604,7 +604,7 @@ class SpringBootSmokeTest extends AbstractAppSecServerSmokeTest {
     then:
     rootSpans.size() == 1
     forEachRootSpanTrigger {
-      assert it['rule']['id'] == '__test_file_upload_block'
+      assert it['rule']['id'] in ['__test_file_upload_block', 'crs-944-140']
     }
     rootSpans.each {
       assert it.meta.get('appsec.blocked') != null, 'appsec.blocked is not set'