# Exploit Title: TufinOS 2.17 Build 1193 - XML External Entity Injection# Exploit Author: konstantinos Alexiou# Date: 2018-10-18# Vendor: https://www.tufin.com# Software Link: https://www.tufin.com/tufin-orchestration-suite/securetrack# CVE: N/A# Category: webapps# 1. Description# The SecureTrack application is vulnerable to XML External Entity injection. # This attack is considered quite serious and can be used to:# (1) Retrieve confidential data# (2) Perform denial of service# (3) Execute server side request forgery attacks# (4) Perform port scanning through the machine on other systems # The issue was identified inside the "Audit" > "Best Practices" module of the "SecureTrack" # application when creating a new Best Practices query and manipulating the "xml" parameter # in the request. When the vulnerability is triggered it doesn't directly return anything # to the attacker but rather the contents of the requested file are written inside # the name field of a best practices. This vulnerability affects every "SecureTrack" # application authentication user role.# 2. Proof of Concept# Step 1: Login to the "SecureTrack" application using any user and then navigate to # "Audit" > "Best Practices". # Step 2: Create and submit a "New Query" while intercepting the traffic:# Step 3: Send the request to repeater and change it to include the following # payload after the "xml=" input field:
--><!DOCTYPE foo [<!ENTITY AAAA SYSTEM "file:///etc/passwd">]><!--
# The payload should be URL encoded before delivered to the application# Step 4: Submit the request to the server.# Step 5: Refresh your browser to view the new Best Practice that was created. The following image # displays that the request was successfully processed by the server and a new Best Practice was # created. The contents of the requested file "/etc/passwd" is saved as the name of the "Best Practice query". # 3. Solution:# Reconfigure the XML processor to use a local static DTD and disallow any declared DTD included in # the XML document. Another solution is to explicitly disable External XML Entities in the parser of # the application.
