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3Com Network Supervisor Directory Traversal Vulnerability

BACKGROUND

3Com Network Supervisor is a network monitoring application which allows
monitoring services on multiple hosts. More information is available at
the following site:

 http://www.3com.com/products/en_US/detail.jsp?tab=prodspec&sku=3C15100E

DESCRIPTION

Remote exploitation of a directory traversal vulnerability in 3Com
Corp.'s Network Supervisor version 5.0.2 may allow an attacker
unauthorized access to files.

3Com Corp.'s Network Supervisor 5.0.2 contains an httpd running on port
21700. By constructing a URL containing '../' sequences it is possible
to access files outside of the webroot for this service.

ANALYSIS

Successful exploitation of this vulnerability would allow a remote
attacker unauthenticated access to any file on the same filesystem
as the server is installed on. Typically this is the C: drive, which
also typically contains the Windows operating system files. One
potential target may be the [SYSTEMROOT]repairsam file, which contains
user password information for the system. Tools are available, which
will recover the password from this file. With this password, an
attacker may gain access to the vulnerable system.

As the vulnerable tool is designed for network administration, it is
likely that the users of an affected system will have elevated
permissions on other systems on the network.

DETECTION

iDEFENSE Labs have confirmed that 3Com Corp.'s Network Supervisor 5.0.2
is affected by this vulnerability. It is suspected that all previous
versions are affected.

WORKAROUND

Restrict remote access to port 21700 at the network boundary, unless
remote parties require service. Access to the affected host should be
filtered at the network boundary if global accessibility is not
required. Restricting access to only trusted hosts and networks may
reduce the likelihood of exploitation.

VENDOR RESPONSE

Vendor patches to address this vulnerability are available for download
at:

3Com® Network Director Version 1.0
Critical Update 1 for the Initial release and Service Pack 1
http://support.3com.com/software/3Com_network_director_v1_0_sp0_1_cu1.exe

3Com® Network Director Version 1.0
Critical Update 1 for Service Pack 2 and Service Pack 3
http://support.3com.com/software/3Com_network_director_v1_0_sp2_3_cu1.exe

3Com® Network Director Version 2.0
Critical Update 1
http://support.3com.com/software/3com_network_director_v2_0_cu1.exe

3Com® Network Supervisor Version 5.1
Critical Update 1
http://support.3com.com/software/3com_network_supervisor_v5_1_cu1.exe

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-2020 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

DISCLOSURE TIMELINE

06/20/2005   Initial vendor notification
07/07/2005   Initial vendor response
09/01/2005   Coordinated public disclosure

CREDIT

Discovery of this vulnerability is credited to iDEFENSE Labs.

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LEGAL NOTICES

Copyright © 2005 Verisign, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.