FS Advisory ID: FS-101501-20-GWSE
Release Date: October 15, 2001
Product: Novell GroupWise
Vendor: Novell (http://www.novell.com)
Vendor Advisory: See vendor website.
Type: Arbitrary file retrieval vulnerability
Author: Mike Shema (firstname.lastname@example.org) Foundstone, Inc. (http://www.foundstone.com)
Operating Systems: Windows 2000
Vulnerable versions: GroupWise 5.5, 6
Foundstone Advisory: http://www.foundstone.com/cgi-bin/display.cgi?Content_ID=327
A vulnerability exists with Novell's GroupWise server which allows for the arbitrary viewing of files anywhere on the system. This includes files outside of the web root, but on the same volume as the web server.
The Novell GroupWise server has a web-based front-end for users to access e-mail and other functions of the server. The default login page is accessed by the URL: /servlet/webacc The webacc usually accesses templates from the "/" directory; however, the servlet will follow directory path traversal. It is possible to view the full path of the server install by passing an invalid argument to the User.html variable: /servlet/webacc?User.html=noexist which will display the full path of the GroupWise install. Arbitrary files can be read by the webacc servlet by passing the appropriate file name and appending a null character to the string: /servlet/webacc?User.html=../../../../../../../../boot.ini%00 Administrators should note that the Groupwise configuration files can be viewed with this exploit. Care should be taken to limit the amount of sensitive data within these files.
Proof of concept
From a browser, make the following URL request: http://server:port/servlet/webacc?User.html=../../../../../../ ../../boot.ini%00
Please contact the vendor for a solution. Customers should obtain upgraded software by contacting their customer support representative to obtain patches. The severity of this vulnerability and vulnerabilities of a similar nature can be significantly reduced by installing the GroupWise server (or other application) files on a disk volume separate from the windows system root.
We would also like to thank Novell for their reaction to this problem and their co-operation in heightening security awareness in the security community.
The information contained in this advisory is the copyright (C) 2001 of Foundstone, Inc. and believed to be accurate at the time of printing, but no representation or warranty is given, express or implied, as to its accuracy or completeness. Neither the author nor the publisher accepts any liability whatsoever for any direct, indirect or conquential loss or damage arising in any way from any use of, or reliance placed on, this information for any purpose. This advisory may be redistributed provided that no fee is assigned and that the advisory is not modified in any way.