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SEC Consult SA-20241107-0 :: Multiple Vulnerabilities in HASOMED Elefant and Elefant Software Updater Unsafe eval() in TestRail CLI IT Security and Insecurity Portal www.waraxe.us Forum Index -> Sql injection -> Interesting SQL Injection case View previous topic :: View next topic Interesting SQL Injection case Posted: Tue Sep 18, 2007 4:16 pm pabloski 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 ) 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 so how can I insert a SQL statement if I can't use ' to pass ascii strings to the script? 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