addlashes()? ?? SQL ?? ???
PHP?? addlashes() ??? ???? ?? ??? ??????? ? ?????. ??? ? ??? SQL ?? ??? ??? ??? ??? ????.
?? 1
?? SQL ?? ?????.
SELECT * FROM users WHERE username = '$username'
$username ??? ????? ??(')? ???? ?? ?? ???? ??? ?? ?? ???? ? ???? ??? ? ????. as:
admin' OR 1=1
?? SQL ?? ?????.
SELECT * FROM users WHERE username = 'admin'' OR 1=1'
addlashes() ??? ????? ??? ???????? ?? ??? ??????? ????. ?????, ??? ?? SQL ?? ????, ???? ??? ??? ??? ? ?? ??.
?? 2
? ?? ? addlashes()? ?? SQL ?? ???? 0x5c(????)? ??? ????? ?? ??? ?????. ??? ?? ?? ??? ?????? ????? ???? ?? addlashes() ??? ??? ????? ??? ????? ?? ? ????.
SELECT * FROM users WHERE username = '$username'
$username ??? ?? ????? ??? ??? ??:
"\x5c'"
addlashes() ??? ???? ??? ???????? ????? ??? ??????? ????. ?? ?? ??? ?? SQL ?? ?????.
SELECT * FROM users WHERE username = "\x5c'\x27"
SQL ?? ??? ?? ???? ???? ??????? ??? ? ?? ???.
??
SQL ?? ??? ???? ?? addlashes() ??? ????? ? ???. ?? ???? mysql_real_escape ?? PDO::quote? ?? ?? ??? ??? ???? ???.
? ??? PHP? `addslashes()`? SQL ?? ??? ????? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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