[NEWS] LimeWire Gnutella Client Directory Traversal and File Disclosure

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion

The SecuriTeam alerts list - Free, Accurate, Independent.

Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html 

- - - - - - - - -



  LimeWire Gnutella Client Directory Traversal and File Disclosure
------------------------------------------------------------------------


SUMMARY

" <http://www.limewire.com/> LimeWire is a file sharing program running on 
the Gnutella Network. It is open standard software running on an open 
protocol, free for the public to use. LimeWire allows you to share any 
file such as mp3s, avis, jpgs, tiffs, etc. Limewire is written in Java, 
and will run on Windows, Macintosh, Linux, Sun, and other computing 
platforms."

Recent versions of the LimeWire client contain vulnerabilities that allow 
a remote user to access many or all files on a users machine.

DETAILS

Vulnerable Systems:
 * LimeWire versions 4.1.2 up to 4.5.6 are vulnerable to File Disclosure
 * LimeWire versions 3.9.6 up to 4.6.0 are vulnerable to Directory 
Traversal

Immune Systems:
 * LimeWire version 4.6.0 (File Disclosure)
 * LimeWire version 4.8.0 (Directory Traversal)

File Disclosure Vulnerability (Inappropriate handling of "resource get" 
requests):
A remote attacker can request and read any file on a host running an 
affected version of LimeWire. Gnutella "push style" requests is also 
vulnerable under most conditions, and therefore a local firewall does not 
prevent the attack. The files accessible to a remote attacker include all 
of the user's private, local files, and any file on the machine if the 
user has administrator privileges, a common scenario in Windows. The 
handling of "resource get" requests is the immediate cause of the problem. 
A request of the form "/gnutella/res/[filename]" returns the named file. 
For example, one can telnet to a LimeWire client using the default 
LimeWire port and type the following text:
GET /gnutella/res/C:\Windows\win.ini HTTP/1.1
User-Agent: I-AM-AN-ATTACKER/1.0
Host: 0.0.0.0:0
Accept: */*
Connection: Keep-Alive

The result is that the LimeWire client reads the file "C:\Windows\win.ini" 
and sends it over the network. Similarly, the attacker may request 
"/gnutella/res//etc/passwd" on Linux or UNIX-based machines. This attack 
has been tested and confirmed on Linux and Windows 2000 platforms.

Workaround:
This problem has been fixed in the recently released LimeWire versions 
4.6.0 and later, which were released promptly by Lime Wire LLC after 
notification of the vulnerability.

Directory Traversal Vulnerability (Inappropriate handling of "magnet" 
requests):
A remote attacker can request and read any file on a host running an 
affected version of LimeWire. The attacker need only be able to connect to 
the LimeWire client "magnet" TCP port (default port, or a port chosen from 
a modest range if default is not available). Gnutella "push style" 
requests are not vulnerable, so a firewall that blocks access to the 
magnet port blocks the attack. The files accessible to a remote attacker 
include all of the user's private, local files, and any file on the 
machine if the user has administrator privileges.

The handling of "magnet" requests is the immediate cause of the problem. A 
request of the form "/magnet10/[rel-filename]" returns the named file, 
relative to the "root" subdirectory of the LimeWire installation, 
regardless of if it is in the "root" directory, or indeed even part of the 
Limewire package. For example, one can telnet to a LimeWire client and 
issue an HTTP request
"GET /magnet10/../../../../../Windows/Win.ini?Simple-test"

This example assumes that LimeWire is installed in its default 
installation directory. The result is that the LimeWire client reads the 
file "C:\Windows\win.ini" and sends it over the network. Similarly attacks 
work on Linux or UNIX-based machines. The attack has been tested and 
confirmed on Linux and Windows 2000 platforms, using several versions of 
LimeWire.

Workaround:
This problem has been fixed in the recently released LimeWire versions 
4.8.0 and later, which were released promptly by Lime Wire LLC 
notification of the vulnerability.


ADDITIONAL INFORMATION

The information has been provided by  <mailto:[email protected]> Kevin 
Walsh.



======================================== 


This bulletin is sent to members of the SecuriTeam mailing list. 
To unsubscribe from the list, send mail with an empty subject line and body to: [email protected] 
In order to subscribe to the mailing list, simply forward this email to: [email protected] 


==================== 
==================== 

DISCLAIMER: 
The information in this bulletin is provided "AS IS" without warranty of any kind. 
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.