Create CVE-2017-15944.yaml

This fixes #1091. I changed line 20 from `part: body` to `part: header`.

cves/2017/CVE-2017-15944.yaml

@@ -0,0 +1,24 @@
+id: CVE-2017-15944
+
+info:
+  name: PreAuth RCE on Palo Alto GlobalProtect
+  author: emadshanab
+  reference: http://blog.orange.tw/2019/07/attacking-ssl-vpn-part-1-preauth-rce-on-palo-alto.html
+  severity: high
+  tags: cve,cve2017,rce,vpn,paloalto
+
+requests:
+  - method: GET
+    path:
+      - "{{BaseURL}}/global-protect/portal/css/login.css"
+
+    matchers-condition: and
+    matchers:
+      - type: word
+        words:
+          - "Last-Modified: Sun, 10 Sep 2017 16:48:23 GMT"
+        part: header
+
+      - type: status
+        status:
+          - 200