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www.waraxe.us Forum Index -> Sql injection -> question about Vbulletin forum
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question about Vbulletin forum
PostPosted: Fri Nov 11, 2005 8:24 pm Reply with quote
super
Active user
Active user
 
Joined: Sep 19, 2005
Posts: 30




ok I registared a null version VB forum and after that I donload the backup database from the VB forum.
now I see my pass hash in the backup file showing
Code:
57ebe983e50b8e129c34b0b7e8d0461b


but when I chack in cookie.txt of my computer then I see my pass hash shoing
Code:
48bc02fa217cfd7c13adac0e2abddefd


that's mean in the cookie.txt my pass value showing
Code:
48bc02fa217cfd7c13adac0e2abddefd

but in the backup database(sql) my pass value showing
Code:
57ebe983e50b8e129c34b0b7e8d0461b

why cookie pass value and backup pass value look like different? Sad

why??????? Sad

have any things which can convert the pass hash 57ebe983e50b8e129c34b0b7e8d0461b to 48bc02fa217cfd7c13adac0e2abddefd ????????????
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PostPosted: Sat Nov 12, 2005 4:07 am Reply with quote
waraxe
Site admin
Site admin
 
Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Vbulletin is hard-to-exploit software Very Happy

VB uses sessionIds and salted md5 hashes. If "remember me" option is enabled, then this piece of code

Code:

if ($send_cookies)
{
  if ($_REQUEST['cookieuser'])
  {
    vbsetcookie('userid', $bbuserinfo['userid']);
    vbsetcookie('password', md5($bbuserinfo['password'] . '[#]license[#]'));
  }


will set up cookie with md5 hash, combined from salted md5 hash and vbb licence number. This salted piece of data - $bbuserinfo['password'] -
is actually gotten as:

Code:

salted_hash = md5( md5(real_password) . salt_string )


So, in summary:

Code:

cookie_password = md5( md5( md5(real_password) . salt_string ) . licence_nr)


Actually kinda triple-md5 Shocked

Now, sessionhash is even less informative:

Code:

function fetch_sessionhash()
{
  return md5(TIMENOW . SCRIPTPATH . SESSION_IDHASH . SESSION_HOST . vbrand(1, 1000000));
}



So, if you can get sessionhash, then only way to use it is to try somehow hijack session before real user will log out. There are protective measures in vbb against this kind of attacks, but it may be possible in some conditions.
If you will have cookie_password, then you must somehow get from vbb sql database salt value (3 chars) and additionally licence nr. Now it is possible to use standard md5 hash attack methods - wordlists and bruteforce. Of course, specially modified software is needed, because of the salted hashes. By the way, rainbow cracking will not help in case of salted hashes.
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PostPosted: Sat Nov 12, 2005 10:23 am Reply with quote
super
Active user
Active user
 
Joined: Sep 19, 2005
Posts: 30




thanks
but what modified software I need for salted hash

Q2: which software or somthing can show this salted hash 57ebe983e50b8e129c34b0b7e8d0461b

to

48bc02fa217cfd7c13adac0e2abddefd
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PostPosted: Sat Nov 12, 2005 1:23 pm Reply with quote
y3dips
Valuable expert
Valuable expert
 
Joined: Feb 25, 2005
Posts: 281
Location: Indonesia




more easier to sniff along the user when login to the site if u see the triple md5 and salt Laughing
i guess u need to change a direction n find another door to break in Razz

[sorry if it doesnt help Razz ]

_________________
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PostPosted: Sat Nov 12, 2005 2:51 pm Reply with quote
super
Active user
Active user
 
Joined: Sep 19, 2005
Posts: 30




what direction you talking about Sad I don't undarstand clearly.
please explain it again Sad
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PostPosted: Sun Nov 13, 2005 8:22 am Reply with quote
super
Active user
Active user
 
Joined: Sep 19, 2005
Posts: 30




I want to change the salt value
Code:
backup_password = md5( md5(real_password) . salt_string )
TO
Code:
cookie_password = md5( md5( md5(real_password) . salt_string ) . licence_nr)


that's mean I want to change(convert) the backup hash value TO cookie hash value!!
which things can do it????
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question about Vbulletin forum
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