Re: ASP/PHP SQL Injection

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

Cheers for your input validation tips guys... but I was actually asking how
one would _look_ for possible SQL injection attacks if one has the PHP/ASP
source code.

What I would like to know is:

1 $variable = get_value_from_url('variable')  // ie
blah.asp?variable="hello"
2 SQL = "SOME SQL" & $variable & "SOME MORE SQL"
or
3 <executing object (i.e. rs.open)> "SOME SQL" & $variable & "SOME MORE SQL"

Does one look for lines 2 or 3 in the source code? and does it have to look
like one of those 2 lines?
or are there other things to look for?

Also, what does one look for in the PHP/ASP source code to see if an XSS
attack is possible?

Cheers,

Davie Elliott

-----Original Message----

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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