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Category:   Application (E-mail Server)  >   EMU Webmail Vendors:   EMUMAIL Inc.
EMU Webmail 'emumail.fcgi' Input Validation Flaw Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1009397
SecurityTracker URL:  http://securitytracker.com/id/1009397
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 11 2004
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): 5.2.7
Description:   Some vulnerabilities were reported in EMU Webmail. A remote user can determine the installation path. A remote user can conduct cross-site scripting attacks.

Dr_insane reported that the 'emumail.fcgi' script does not filter HTML code from user-supplied input before displaying the information. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the web mail software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Some demonstration exploit URLs are provided:

http://[target]:1010/webmail/emumail.fcgi?passed=parse&variable=%3Cscript%3Ealert(%22G%22)%3C/script%3E
http://[target]:1010/webmail/emumail.fcgi?passed=go_index&folder=<script>alert("G")</script>

It is also reported that the username and password fields of the login page are not filtered.

The report also indicates that the 'init.emu' sample script in a default installation will display the 'page_root' value, which discloses the home directory. A demonstration exploit URL is provided:

http://[target]:1010/webmail/init.emu

Impact:   A remote user can determine the installation path.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the webmail software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Solution:   No solution was available at the time of this entry.
Vendor URL:  www.emumail.com/solutions/webmail/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (NT), Windows (2000), Windows (XP)

Message History:   None.


 Source Message Contents

Subject:  http://members.lycos.co.uk/r34ct/main/emu/emu.txt


http://members.lycos.co.uk/r34ct/main/emu/emu.txt

EMUMAIL 5.2.7 cross site scripting & path exposure vulnerabilities

Release Date:
-------------
March 11, 2004

Severity:
----------
Low

Vendor:
---------
www.emumail.com

Systems Affected:
------------------
Microsoft Windows NT 4.0 (all versions)
Microsoft Windows 2000 (SP3 and earlier)
Microsoft Windows XP (all versions)

Services Affected:
-------------------
Webmail service (1010)


Description:
------------
EMU Webmail is a softare package that runs on your web server, allowing your user access 
to their own POP or
IMAP email accounts from any web browser. EMU webmail has many advantages, including the 
following:
EMU webmail is a universal client
EMU WEbmail is email security
EMU webmail is for everyone
EMU webmail is simplicity for system administrations.


Vulnerabilities:
1.Cross site scripting
2.PAth exposure

Technical Description:

1. Some Xss vulnerabilities have been identified in EMUMAIL 5.2.7. It may be possible for 
an attacker to instert
javascript and html code. Look at the following examples:

a)http://169.254.133.19:1010/webmail/emumail.fcgi?passed=parse&variable=%3Cscript%3Ealert(%22G%22)%3C/script%3E
b)http://169.254.133.19:1010/webmail/emumail.fcgi?passed=go_index&folder=<script>alert("G")</script>
c)In the login page you can insert javascript code in the "username" and "password" fields


2. The default installation of Emumail installs a number of sample scripts. By pointing 
your browser to:
http://169.254.133.19:1010/webmail/init.emu you will get the following line:
page_root= C:/[pathfile_to_your_home_directory]




Workaround:
-----------
1)Filter the data that the user sends
2)change the location of the file init.emu


Credit:
Dr_insane
Http://members.lycos.co.uk/r34ct/


Feedback
Please send your comments to: dr_insane@pathfinder.gr

 
 


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