ASP/PHP SQL Injection

["coder" <elite.coder () ntlworld com>]

Hi all,

I have been reading quite a bit into SQL injections and I just wondered if
my thinking is correct:

If one has the ASP or PHP source code for a site, they would just look for-

(written in a pseudo-ish code as I assume the same principles exist for ASP
and PHP)

$variable = get_value_from_url('variable')  // ie blah.asp?variable="hello"

SQL = "SOME SQL" & $variable & "SOME MORE SQL"
or
<executing object (i.e. rs.open)> "SOME SQL" & $variable & "SOME MORE SQL"

When looking for potential SQL Injection attacks, its one of the 2 SQL lines
one would look for... is that correct? And to stop SQL Injection attacks,
one only has to "sanitise" the variable with CLng()  in the case of numeric
fields and in the case of alphanumeric fields a built-in PHP/ASP/MySQL
function can be used.

Also, assuming my thinking above is correct, what does one look for when
checking for possible XSS attack?

Thanks for your input,

Davie Elliott



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