It is assumed that the cast user data to a numeric type is fully protected from SQL injection vulnerabilities.
Look at simple example:
This code looks like SQLi protected, but it is not true.
Do not forget two obvious facts:
1. Minus is SQL operatator
2. Numbers can be negative
Now its easy to understand SQL logic in this case (w/o injection):
And SQL injection attack vector in this case:
In our example attacker can bypass auth.
This example requires tables role and role0 both in database.
Look at simple example:
$action = $_GET['do']; $r=$db->query("select role".((int)$action)." from users where id=".((int)$_SESSION['user_id'])); if($row=$r->fetchArray()){ if((int)$row[0]!==1){ die('permission denied'); }else{ doAction($action); } }
This code looks like SQLi protected, but it is not true.
Do not forget two obvious facts:
1. Minus is SQL operatator
2. Numbers can be negative
Now its easy to understand SQL logic in this case (w/o injection):
select role0 from users where id=0
And SQL injection attack vector in this case:
select role-1 from users where id=0
In our example attacker can bypass auth.
This example requires tables role and role0 both in database.
Should the last sentence say "columns role and role0 both in the table users"?
ОтветитьУдалить> describe us;
ОтветитьУдалить+-------+------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------+------+-----+---------+-------+
| role0 | text | YES | | NULL | |
| role1 | text | YES | | NULL | |
| role | text | YES | | NULL | |
+-------+------+------+-----+---------+-------+
3 rows in set (0.04 sec)
> select role-1 from us;
+--------+
| role-1 |
+--------+
| -1 |
+--------+
1 row in set (0.00 sec)
array list
0 => key
0 => value (-1)
$me=mysql_query("SELECT role-1 FROM us");
$f=mysql_fetch_array($me);
echo $f[0]; //output -1
var_dump(-1!==1); //true
dude failed
in the second case
snip___
MariaDB [data]> select role+1 from us;
+--------+
| role+1 |
+--------+
| 1 |
+--------+
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УдалитьЭтот комментарий был удален автором.
Удалитьhttp://pastebin.com/SLGw3ECU
ОтветитьУдалитьFor Numeric type of columns role, role0...roleN of course :)
ОтветитьУдалитьThe article fail vector
ОтветитьУдалитьBut I wrote about it, see 8)
What if just manually change the stupid value? I mean inline URL editing. In that case this isn't new. Not easy to exploit
ОтветитьУдалитьI think author want to show that u can't use critical values from frontend. I wouldn't use roles at least.
Can't understand your post. This vector works well.
ОтветитьУдалитьAnd text columns obviously not about this.
Just about minus as a SQL operator. Types of database columns which can be operated through minus depends from DB type. Test SQLite, for example.
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ОтветитьУдалитьYour text can be considered a case of
ОтветитьУдалитьMariaDB [data]> select role from us;
+------+
| role |
+------+
| 2 | => me row output 2
+------+
1 row in set (0.00 sec)
===============================
auth bypassvector
MariaDB [data]> select role-1 from us;
+--------+
| role-1 |
+--------+
| 1 |
+--------+
1 row in set (0.00 sec)
output row => 1
and bypass :)
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ОтветитьУдалитьI have created another example from this issue in #0x3004CTF. Check it:
ОтветитьУдалитьhttp://pastebin.com/JpKVpC2m :)
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