Testing for WS HTTP GET parameters/REST attacks (OWASP-WS-005)

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HTTP GET parameters.

Contents

Brief Summary

Many XML applications are invoked by passing them parameters using HTTP GET queries. These are sometimes known as “REST-style" Web Services. These Web Services can be attacked by passing malicious content on the HTTP GET string (e.g. Extra long parameters (2048 chars), SQL statements/injection or OS Injection parameters). REST = Representational State Transfer).


Description of the Issue

Given that Web services REST are in effect HTTP-In -> WS-OUT at attack patterns are very similar to regular HTTP attack vectors, discussed throughout the guide.

Example: The HTTP request with query string /viewDetail=detail-10293, the HTTP GET parameter is detail- 10293.

Black Box Testing

Say we had a Web Service which accepts the following HTTP GET query string: https://www.ws.com/accountinfo?accountnumber=12039475&userId=asi9485jfuhe92

The resultant response would be similar to:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Account="12039475">
<balance>€100</balance>
<body>Bank of Bannana account info</body>
</Account>

Testing the data validation on this REST web service is similar to generic application testing:

Try vectors such as: https://www.ws.com/accountinfo?accountnumber=12039475' exec master..xp_cmdshell 'net user Vxr pass /Add &userId=asi9485jfuhe92


Grey Box Testing

References

The OWASP Fuzz vectors list: [1]