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Figure 3-17 SQLPing scans for instances of SQL Server and guesses a few passwords
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OracleTNS Enumeration, TCP 1521/2483
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Popularity: Simplicity: Impact: Risk Rating: 5 8 2 5
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The Oracle TNS (Transparent Network Substrate) listener, commonly found on TCP port 1521, manages client/server database traffic The TNS listener can be broken down
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into two functions: tnslsnr and lsnrctl Client/server database communication is managed primarily by tnslsnr, while lsnrctl handles the administration of tnslsnr By probing the Oracle TNS Listener, or more specifically the lsnrctl function, we can gain useful information such as the database SID, version, operating system, and a variety of other configuration options The database SID can be extremely useful as it is required at time of login By knowing the SID for a particular Oracle database, an attacker can launch a brute force attack against the server Oracle is notorious for having a vast amount of default accounts that are almost always valid when TNS enumeration is available (if the database admins don t care enough to lock down the listener service, why would they care enough to remove the default accounts ) One of the simplest tools to inspect the Oracle TNS listener is the AppSentry Listener Security Check (wwwintegrigycom/security-resources/downloads/lsnrcheck-tool) by Integrigy This Windows-based freeware application is as point and click as you can get, making TNS enumeration a walk in the park For the non-GUI folks, tnscmdpl is a Perl-based Oracle <=9 TNS enumeration tool written by jwa It was later modified and renamed to tnscmd10gpl by Saez Scheihing to support the Oracle 10g TNS Listener While these tools perform the basic task of TNS Listener enumeration, there are two additional suites that really bring together the most common tasks when attacking Oracle databases The Oracle Assessment Kit (OAK) available from wwwdatabasesecuritycom/dbsec/ OAKzip by David Litchfield and the Oracle Auditing Tools (OAT) available from www cqurenet/wp/test/ by Patrik Karlsson are two Oracle enumeration suites that provide similar functionality Although each has its strengths, both OAK and OAT are focused around TNS enumeration, SID enumeration, and password brute forcing The specific tools within each toolset are identified in Tables 3-5 and 3-6 Finally, for the most simple SID enumeration tasks, Patrik Karlsson has also developed the getsids tool (wwwcqurenet/wp/getsids/)
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Oracle TNS Enumeration Countermeasures
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Arup Nanda has created Project Lockdown (wwworaclecom/technology/pub/articles/ project_lockdown/project-lockdownpdf) to address the TNS enumeration issues as well as the general steps to harden the default installation of Oracle His paper describes how to configure strengthened permissions and how to set password on the TNS Listener so that anyone attempting to query the service will have to provide a password to obtain information from it For Oracle 10g and later installations, the default installation is a bit more secure, but they also have some downfalls Integrigy has provided an excellent white paper on Oracle security that further describes this attack and others and also covers how to further secure Oracle Integrigy s paper is located at wwwintegrigycom/ security-resources/whitepapers/Integrigy_Oracle_Listener_TNS_Securitypdf
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Enumeration
Tool ora-brutesid ora-getsid
Description Oracle SID brute forcing tool that attempts to generate and test all possible SID values within a set keyspace SID guessing tool that uses an attacker-supplied le OAK comes with sidlisttxt, which contains commonly used Oracle SIDs Password brute force that uses an attacker-supplied le OAK comes with passwordstxt, which comes with some common passwords for default Oracle accounts Brute forces usernames via an attacker-supplied le OAK comes with userlisttxt, which contains all of the default Oracle usernames Directly queries the Oracle TNS listener for information Tool that attempts to exploit the auth-alter-session vulnerability within Oracle
ora-pwdbrute
ora-userenum
ora-ver ora-auth -alter-session
Table 3-5
Oracle Assessment Kit (OAK)
Tool opwg oquery osd ose
Description Oracle Password Guesser Performs SID enumeration and Oracle brute forcing opwg also tests for default Oracle accounts Oracle Query Basic SQL query tool for Oracle Oracle SAM Dump Dumps the underlying Windows operating system s SAM via the Oracle service using pwdump/TFTP Oracle SysExec Allows for remote execution of commands on the underlying operating system In automatic mode, ose uploads netcat to the server and spawns a shell on port 31337 Oracle TNS Control Directly queries the Oracle TNS listener for information Oracle Auditing Tools (OAT)
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