Attacking the application operating logics (and/or).Vulnerability exploitation by the method of blind SQL Injection.Vulnerabilities in the functions of WAF request normalization.?id=1+union+(select+1,2+from+users) But sometimes, the signatures used The following request gets to WAF signature STRCMP(expr1,expr2) returns 0 if the strings are the same, -1 if theįirst, argument is smaller than the second one, and 1 otherwise. Select user from er where user = ‘user’ OR position(0x2a in Select user from er where user = ‘user’ OR mid(password,1,1)įind_in_set(‘2a’,hex(mid(password,1,1)))=1 Select user from er where user = ‘user’ OR It becomes possible to exploit the vulnerability with the method ofīlind-SQL Injection by replacing SQL functions that get to WAFīenchmark() -> sleep() Wide variety of logical requests.Īn example of various request notations with the same meaning. Of the equality one – It is amazing, but many WAFs miss it! Negation and inequality signs (!=,, ) can be used instead The following requests allow one to conduct a successful attack for.These requests may be successfully performed using HPF.The SQL request becomes select key from table where.This request is successfully performed using the HPP technique.SQL=" select key from table where id= "+Request.QueryString("id") Successful conduction of an HPP attack bypassing WAF depends on theĮnvironment of the application being attacked. This request will be successfully performed using HPP.(replacement of a regular expression with the empty string). The given example works in case of excessive cleaning of incoming data Instead of construction /**/, any symbol sequence that WAF cuts off Similarly, the following request doesn’t allow anyone to conduct an.The given example works in case of cleaning of dangerous traffic, not inĬase of blocking the entire request or the attack source.Įxample Number (2) of a vulnerability in the function of request After being processed by WAF, the request will become.If there is a corresponding vulnerability in the WAF, this request.The following request doesn’t allow anyone to conduct an attack.Example: (MySQL): SELECT * from table where id = 1 union select 1,2,3Įxample: (PostgreSQL): SELECT * from table where id = 1 select 1,2,3īypassing WAF: SQL Injection - Normalization MethodĮxample Number (1) of a vulnerability in the function of request
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