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Upcoming Events

Portfolio Netpublish Server 7 Directory Traversal

Portfolio Netpublish Server 7 is vulnerable to a Directory Traversal Attack

Vulnerablity Type / Importance: Information Leak / High

Problem discovered: October 11th 2005
Vendor contacted: October 11th 2005
Advisory published: December 19th 2005

Abstract:
NetPublish Server from Extensis is a database-driven file cataloging product, which is accssible via a web interface. The service is vulnerable to a directory traversal attack, which allows access to files outside the web root directory.

Description:
During a recent pentration test IRM identified a security issue associated with the Portfolio Netpublish Server 7 product. Arbitrary files could be retrieved from the server by using a 'directory traversal' attack within the URL, as shown below (information relating to our client has been obscured):
http://xxx.xxx.xxx.xxx/netpub/server.np?base&site=XXXintra&catalog=catalog&template=../../../../../../../../../boot.ini

As a result of supplying the above URL the contents of the file 'boot.ini' are displayed in the web browser. Furthermore, by default the server runs with the privilege level of the local SYSTEM account (on Windows) and could therefore be used to retrieve the contents of any file on the server. The risk is reduced if the product is run on Unix, as the privilege level used is that of the 'nobody' account.

Tested Versions:
Netpublish Server 7

Tested Operating Systems:
Microsoft Windows 2000
Linux

Vendor & Patch Information:
Extensis were contacted on October 11th 2005 and although they have not produced a patch to prevent the directory traversal they have released a KnowledgeBase article on their web site, which attempts to mitigate the issue. The article is linked below.

Workarounds:
http://www.extensis.com/en/support/kb_article.jsp?articleNumber=3302201

Credits:
Research & Advisory: A Davis and M Faour

Disclaimer:
All information in this advisory is provided on an 'as is' basis in the hope that it will be useful. Information Risk Management Plc is not responsible for any risks or occurrences caused by the application of this information.

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