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A friend of mine had set up a web site for her new company on her home DSL connection She was concerned that a competitor or random attacker might deface her new site, so she asked me to try and hack into her server and fix any problems I found, so I agreed to her request My first step was a simple ping to gather the IP address in question and then to fire off Fscanexe (wwwfoundstonecom) to round up a listing of the services running I knew it must have been an NT server because she doesn t know UNIX, but there were no signs of NetBIOS ports anywhere Maybe she knew how to harden an NT system and remove all unnecessary NetBIOS services, or more likely she had a personal firewall set up Well, the Fscan results were in: 80 and 5631 were all I had to work with Personal firewall, prepare for battle I started with the most basic attack I had available, pcAnywhere password guessing I only tried two guesses for fear that it had been configured to limit logon attempts to only three I tried administrator with no password No dice Next guess, password Nope It was time to move on to phase two: port 80 attacks I gathered definitive information about the web server and its version Telneting to port 80 and typing HEAD /indexhtml gave me the information I needed: Microsoft s IIS, version 40 I wondered if she had installed Option Pack 4 without patching Rain Forest Puppy s lovely MDAC vulnerability The webpingpl script, found on the Hacking Exposed web site (http://wwwhackingexposedcom), worked like a charm for that Yes! The web server was vulnerable to the MDAC attack A few seconds later the exploit worked Bang! remote prompt with Administrator access My next move was to Pwdump the box and to get John the Ripper cracking Lanman passwords Then I decided to hunt down that password for pcAnywhere A simple dir *cif /s from the root of the drive searched the system for any cif files Once I found it, I used TFTP to transfer it back to my machine, where Robin Keir s ShoWin (wwwkeirnet) awaited Using ShoWin I obtained the password use_from_Work! for pcAnywhere from the cif file I brought up pcAnywhere to connect to the system with the newly discovered password Ugh I made a typo, and it just stopped responding (the three-failed-logins lockout feature had been enabled) Now what No GUI access I needed my GUI! I went back to my remote console and used TFTP to grab files from my system The tools I needed for this mission were available complements of the NT Resource Kit: Pulistexe from the NTRK to list out the running processes and Killexe to stop services After listing out the processes, I found the Process ID (PID) for the firewall service Using the PID, I used the kill executable to stop the firewall in its tracks A quick port scan confirmed I had unrestricted access to all my favorite NetBIOS ports Conveniently, John the Ripper made short work of the alphanumeric password g00dluck! I used my new-found Administrator password with the net use command to share out the administrative C$ (entire C drive) share for my viewing pleasure Since I was locked out of pcAnywhere, I needed to devise a way to reset it Smiling nefariously, I copied over the files for the WinVNC remote administration tool I used the NT scheduler to execute a batch file that installed the WinVNC service.

Like magic, we are greeted with an xterm that has root privileges Obviously, if this was a system used to perform network management or that had an IDS that used tcpdump, the effects would be devastating Don t think an IDS would have a remotely exploitable buffer overflow In 2003, the open-source IDS Snort had not one but two In March 2003, the IIS X-force crew found a buffer overflow in Snort s RPC decoding, and in April 2003 Core Security Technologies found an integer overflow in the TCP stream reassembly engine What makes this problem worse is the fact that both the RPC decoding and the TCP stream reassembly engine, named stream4, are enabled by default The Snort project had source patches and fixed binaries available for download within hours of the vulnerability advisories being released; however, an exploit was publicly available for the TCP stream reassembly vulnerability shortly after the advisory was released

The abbreviation rms means root-mean-square, the value used when a meter is calibrated to read voltage or current When we say 120volts AC, we really mean it is 120-volts rms The rms is a way of equating AC and DC It is the heating effect of AC compared to DC

Finally, I used my VNC client to connect to the server with the password I specified in my batch file I switched the client from read-only mode to interactive mode Voil ! I had my interactive GUI! The first thing I did was unlock pcAnywhere through the GUI so I could log in later Then I tagged the desktop wallpaper with a little JPEG file that I had made of a mocked-up invoice charging my friend for my services Next, I restarted the firewall with the GUI to protect the system from other attackers This killed my WinVNC connection (as expected), so I reconnected to the system using pcAnywhere and the password I had heisted Once connected, I closed the WinVNC connection, stopped the service, and deleted the WinVNC files To be thorough, I deleted Pulist, Kill, Netcat, and Pwdump, and closed out my remote MDAC session Finally, I patched the MDAC vulnerability using the strategy detailed by Rain Forest Puppy (http://wwwwiretripnet/rfp) Once I had rebooted the machine (for the MDAC patch to take effect), the attack and fix were complete and my job was done