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For more information on Registry settings that will help protect Windows-based Internet servers against common DoS attacks, see the discussion of DoS in 6 We also recommend investigating the many perimeter security products that have the ability to recognize and blunt common TCP/IP DoS attacks like teardrop, land, OOB, SYN flooding, and so on See 12 for more information about these Non-IP DoS attacks, including snork and nrpc, were also fixed post-SP3 (these two require access to ports 135 139 to work) OK, the detour is over Let s get back to our methodical climb to Administrator status

4:

Key Name HKLM\SOFTWARE\Microsoft\ Windows\CurrentVersion\Run HKLM\SOFTWARE\Microsoft\ Windows\CurrentVersion\RunOnce HKLM\SOFTWARE\Microsoft\ Windows\CurrentVersion\RunOnceEx HKLM\SOFTWARE\Microsoft\ Windows NT\CurrentVersion\AeDebug HKLM\SOFTWARE\Microsoft\ Windows NT\CurrentVersion\Winlogon\

Following a successfully guessed password, you will find that enum has authenticated to the IPC$ share on the target machine Enum is really slow at SMB grinding, but it is accurate (we typically encounter fewer false negatives than other tools) Guessing TS passwords is more complex, since the actual password entry is done via bitmapped graphical interface TSGrinder automates Terminal Server remote password guessing and is available from http://wwwhammerofgodcom/downloadhtml Here is a sample of a TSGrinder session successfully guessing a password against a Windows Server 2003 system (the graphical logon window appears in parallel with this commandline session):

Default Permission Everyone: Set Value Server Operators: Set Value Everyone: Set Value Everyone: Set Value Server Operators: Set Value

C:\>tsgrinder 192168230244 password hansel - failed password gretel - failed password witch - failed password gingerbread - failed password snow - failed password white - failed password apple - failed password guessme - success!

Table 5-5

For guessing other services like Sharepoint, we again recommend THC s Hydra or Brutus, since they re compatible with multiple protocols like HTTP and HTTPS Guessing SQL Server passwords can be performed with sqlbf, available for download from sqlsecuritycom

The preceding settings may break some applications, so test them on non-production systems first These values are also often used to run backdoor applications at boot time, as we will discuss later in this chapter

Several defensive postures can eliminate, or at least deter, such password guessing, including the following: Use a network rewall to restrict access to potentially vulnerable services (such as SMB on TCP 139 and 445, MSRPC on TCP 135, and TS on TCP 3389) Use the host-resident Windows Firewall (Win XP and above) to restrict access to services Disable unnecessary services (be especially wary of SMB on TCP 139 and 445) Enforce the use of strong passwords using policy Set an account-lockout threshold and ensure that it applies to the built-in Administrator account Log account logon failures and regularly review Event Logs

It should be evident by now that privilege escalation is extremely difficult to pull off, unless the target system is grossly misconfigured or the user account being escalated already has a high degree of privilege on the system (for example, a member of the Server Operators group) Next, we will deal with the worst-case scenario of security: Administrator-level access has been obtained on your system

What s the point of reading on if someone has already gained Administrator on my machine you may be asking Unless you feel like wiping your precious server clean and reinstalling from original media, you ll have to try and identify what specifically has been compromised More importantly, attackers with Administrator credentials may have only happened upon a minor player in the overall structure of your network and may wish to install additional tools to spread their influence Stopping intruders at this juncture is possible and critical This section will detail some key tools and techniques deployed in this very important endgame played by malicious hackers

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5: