Please find attached the advisory regarding MicroWorld's MailScan for
Mailservers.
Cheers,
Oliver
MicroWorld MailScan - Multiple Vulnerabilities within Admin-Webinterface
========================================================================
Affected Products <<
- MailScan for Mail Servers
* Version: 5.6.a with espatch1
* Win32 Platform
Other Mailscan Products, Versions, also, if available
for other platforms, were not tested.
Product/Company Information <<
From MicroWorld's website: "MailScan 5.6 is the world's most
advanced Real-Time AntiVirus and AntiSpam solution for Mail Servers.
The software safeguards organizations against Virus, Worm, Trojan and
many other malware breeds with futuristic and proactive technologies.
Employing an array of intelligent filters, MailScan offers powerful
protection against Spam and Phishing mails along with comprehensive
Content Security."
http://www.microworld.de
http://www.mwti.net
Vulnerabilities <<
MailScan offers "Web Based Administration". The administration console
(Server.exe) is running as an http service on tcp port 10443 with
LocalSystem privileges. The communication is plain http without SSL/TLS.
The interface is vulnerable to the attacks described below. All attacks
do *not* require authentication.
-- >> Directory Traversal <<
It is possible to access files on the system outside of the webroot
directory with privileges of the LocalSystem account:
echo -e "GET /../../../../boot.ini HTTP/1.0\r\n\r\n" | nc <server> <port>
-- >> Authentication bypass <<
After a login attempt with an invalid username and password, the application
is setting a cookie at the webclient with the following content:
Set-Cookie: User=admin; path=/
Set-Cookie: login=true; path=/
Set-Cookie: IsAdmin=false; path=/
Set-Cookie: IP=; path=/
Providing valid username and password will give a cookie with the
following content:
Set-Cookie: User=admin; path=/
Set-Cookie: login=true; path=/
Set-Cookie: IsAdmin=true; path=/
Set-Cookie: IP=; path=/
It is sufficient to set the cookie as shown above to get authenticated on the
admin interface. The user "admin" is a default account, with a password set
during
installation.
*BUT* requesting a resource on the webserver *without* supplying a cookie will
also grant access to the requested resource. The attacker just needs to know
the path to the resource.
-- >> Cross-Site-Scripting (XSS) <<
http://ip:10443/<script>alert("No_Problem_its_just_an_admin_interface")</script>
-- >> Access to Logfile <<
It is possible to access the logfiles of the application because the folder
"/LOG" inside the webroot ("C:\Program Files\Common Files\MicroWorld\WebServer")
is not protected.... note that this does not require the directory traversal,
mentioned before and thus is imho a separate vuln.
The logfiles contain different information, like installation path, ip
adresses,
and error messages.
http://ip:10443/LOG/W072808.LOG (Format seems to be W:Month:Date:year)
and
http://ip:10443/LOG/Weblog.LOG
History <<
28. July 2008 - Touching base with MicroWorld's Support via Messenger
28. July 2008 - Sending High-Level description of vulns and RFP-Policy to agree
30. July 2008 - MicroWorld agreed to the policy
30. July 2008 - Detailed description and PoC-Script creating an admin user
without
authenticatin send to Microworld
01. Aug. 2008 - Asking Microworld if they were able to reproduce
02. Aug. 2008 - MicroWorld answered: "Not Yet"
05. Aug. 2008 - Asking Microworld if they were able to reproduce, and if yes,
when
a patch will be available
13. Aug. 2008 - No response from Microworld; I informed them that i will publish
an advisory within the next days
15. Aug. 2008 - Advisory release
Credits <<
mail: Oliver-dot-karow-at-gmx-dot-de
advisory: http://www.oliverkarow.de/research/mailscan.txt
blog:
http://oliver.greyhat.de/2008/08/15/multiple-vulnerabilities-within-mailscan-admin-interface/
