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www.waraxe.us Forum Index -> Sql injection -> Interesting SQL Injection case
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Interesting SQL Injection case
PostPosted: Tue Sep 18, 2007 4:16 pm Reply with quote
pabloski
Beginner
Beginner
Joined: Sep 14, 2007
Posts: 3




Hi to all, I'm new to this forum and I'm new to SQL Injection, too.

I'm studying SQL Injection and I have selected as target the famous ( mmm not so famous after all Very Happy ) blogging platform dBlog ( http://www.dblog.it if someone is interested )

Ok, I was thinking to bypass the login form, I have studied some papers and cheat sheets and it seems feasible. The blog platform in question is written in VbScript and uses Jet database ( .mdb ) as storage.

That said, I'm studying this piece of code

Code:

FUserID = Request.Form("UserID")
FPassword = Request.Form("Password")

If FUserID <> "" AND FPassword <> "" Then
SQLAutori = " SELECT [Nick], [UserID], [Password], [Admin] FROM [Autori] WHERE [UserID] = '"& ControlloSQLInjection(FUserID) &"' "
Set RSAutori = Server.CreateObject("ADODB.Recordset")
RSAutori.Open SQLAutori, Conn, 1, 3

If NOT RSAutori.EOF Then
RSAutori.MoveFirst
If RSAutori("Password") = getSHAPassword(FPassword) Then
Session("BLOGNick") = RSAutori("Nick")
Session.TimeOut = 60
If RSAutori("Admin") = True Then
Session("BLOGAdmin") = True
Else
Session("BLOGAdmin") = False
End If


the login form accepts two fields, Password and UserID, then the script verifies they are not empty and execute a query against UserID.....finally it uses the recordset obtained to verify if SHA1(Password) == stored password hash

the function ControlloSQLInjection is an anti-SQL injection measure....it replaces the following characters

[ --> [[ & Chr(0)
] --> []]
[[ & Chr(0) --> [[]
' --> ''
% --> [%]
_ --> [_]
# --> [#]

as you can see the problem is the substitution ' -- ''

I have red something about UTF7 and encodings used to bypass this kind of filters, but frankly I haven't understood the whole point at all Embarassed

so how can I insert a SQL statement if I can't use ' to pass ascii strings to the script?
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