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:kwalsh@cs.cornell.edu> 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:
list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to:
list-subscribe@securiteam.com
====================
====================
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.
