To link the two databases, which is better suited to cases when theĭata exchange needs to be performed on a regular basis. Is to retrieve data that resides on a remote database as an alternative Is used on SQL Server to perform a one-time connection to a remote OLEĭB data source (e.g., another SQL server). Your machine on only a few specific ports. ThisĬan be very useful when the remote database server can connect back to Port number after the destination Internet Protocol (IP) address. However, you can connect to a different port, simply by specifying the The attacker is performing ingress filtering, the connection will fail. For thisĪttack to work the victim database must be able to open a TransmissionĬontrol Protocol (TCP) connection to the attacker's database on theĭefault port 1433 if egress filtering is in place at the victim or if This is accomplished using the OPENROWSETĬommand and can be an attacker's best friend where available. To the attacker's database and carry query data over the connection. Permits an attacker to create a connection from the victim's database Database Connectionsįirst alternative channel is specific to Microsoft SQL Server and Is to package the results of an SQL query in such a way that they can be carried back to the attacker using one of the three alternative channels. Injection: database connections, DNS, e-mail, and HTTP. Will discuss four separate alternative channels for blind SQL They tend to rely on the databases’ supported functionality by way ofĮxample, DNS is a channel that can be utilized with SQL Server and The channels are not applicable to all databases, as Instead of relying on an inference technique to derive data,Ĭhannels apart from the HTTP response are co-opted into to carry chunks Injection vulnerabilities is the use of alternative, out-of-boundĬhannels. Second major category of techniques for retrieving data with blind SQL
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