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www.waraxe.us Forum Index -> PhpBB -> phpbb <= 2.0.14 bbcode.php vulnerable
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phpbb <= 2.0.14 bbcode.php vulnerable
PostPosted: Sun May 08, 2005 11:01 am Reply with quote
subzero
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bbcode.php

phpbb.com have released a new version of phpbb.
As you can see bbcode.php (<=2.0.14) dont properly sanitize $text

vulnerable code was found by staff from castlecop. Exploit will be publish 5 days later. If you can wait for more, do it yourself

Code:
function bbencode_second_pass($text, $uid)
{
   global $lang, $bbcode_tpl;
   [b]$text = preg_replace('#(script|about|applet|activex|chrome):#is', "\\1:", $text);   //fixed added for phpbb 2.0.15[/b]


From the patch provided from phpbb 2.0.15 , you can figure out how to manipute any phpbb forum. Wink


(edited version numbers as there were typos -shai-tan)
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PostPosted: Sun May 08, 2005 11:51 am Reply with quote
shai-tan
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Im a little busy to work it out. The sploit will be long released before I would work it so Ill get it when its released.

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?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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PostPosted: Sun May 08, 2005 9:43 pm Reply with quote
zer0-c00l
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anyone got a exploit for it?
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PostPosted: Mon May 09, 2005 9:18 am Reply with quote
shai-tan
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Its only I four day wait.
Or work it out your self. There are enough hints on the net Ive seen.

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Shai-tan

?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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PostPosted: Mon May 09, 2005 1:10 pm Reply with quote
subzero
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Patch for code 2.0.15

bold - fixed for 2.0.15

----------------------------------
// [img]image_url_here[/img] code..
// This one gets first-passed..
$patterns[] = "#\[img:$uid\]([^?].*?)\[/img:$uid\]#i";

-----------------------------------

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

// phpBB code.. (no xxxx:// prefix).
$patterns[] = "#\[url=((www|ftp)\.[^ \"\n\r\t<]*?)\]([^?].*?)\[/url\]#i";
------------------------------------------

and its has connection to function make_clickable($text)

version 2.0.5 have added code to sanitize those script|about|applet|activex|chrome.

its mean that we can embed those text into [img] [/img] code and fooling user to click them.
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PostPosted: Mon May 09, 2005 4:48 pm Reply with quote
y3dips
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however , i think i agree with subzero Wink

how about disabling BBcode ?

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PostPosted: Mon May 09, 2005 5:54 pm Reply with quote
shai-tan
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You could but a lot of sites need bbcode like book fan sites. They sometimes only reckconise people from there bbcoded sigs. And a lot of sites use the [img] tags a lot. It wouldnt really be far on the users from a end user point of veiw. But a security point of veiw would be to just turn it of or update your forums.

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?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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PostPosted: Mon May 16, 2005 12:06 pm Reply with quote
KingOfSka
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wait please Smile
as usual i didn't understood all...
this bug could lead to XSS if i'm right, and it's caused by the fact that the script doesn't check if in the url are present words like script,applet and so on..
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PostPosted: Mon May 16, 2005 12:06 pm Reply with quote
KingOfSka
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wait please Smile
as usual i didn't understood all...
this bug could lead to XSS if i'm right, and it's caused by the fact that the script doesn't check if in the url are present words like script,applet and so on..
the only thing i can't understand is where to insert that script code.. i'm trying to understand by learning php reg exp..
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Re
PostPosted: Mon Jun 20, 2005 10:26 am Reply with quote
mister
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Always None on That ? Laughing
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phpbb <= 2.0.14 bbcode.php vulnerable
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