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Understanding WU-FTPD Exploits: A Guide to Vulnerability and RootKit Installation

This exercise teaches you the techniques used by hackers to intrude into web, mail, and FTP servers. You will learn how to discover vulnerable systems, exploit these vulnerabilities, and cover your tracks by installing RootKits. Topics include reconnaissance using tools like Nmap, understanding buffer overflow attacks, and the installation of RootKits after gaining a root shell. Note: This process is intended for educational purposes within a controlled internal network environment only.

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Understanding WU-FTPD Exploits: A Guide to Vulnerability and RootKit Installation

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  1. A Real World Attack: wu-ftp

  2. Description • There have many intrusion accident happened in day. Do you know what technique that crackers can intrude your web server, mail server and ftp server. • Today, this exercise will guide you through the process of discoveringa vulnerable system, exploitingthe vulnerability, and installing software to cover your tracks.

  3. Purpose • Located a vulnerable system • Exploit that vulnerability to gain a root shell • Installed a RootKit • Access the system via the RootKit

  4. Principle and Pre-Study (I) • CERT Advisory CA-1999-13 Multiple Vulnerabilities in WU-FTPD • MAPPING_CHDIR Buffer Overflow • Message File Buffer Overflow • SITE NEWER Consumes Memory • http://www.cert.org/advisories/CA-1999-13.html

  5. Principle and Pre-Study (II) • What is Buffer overflow? A type of programmatic flaw that is due to a programmer allowing for an unbounded operation on data.

  6. Required Facilities • WARNING: • This process of cracking a system is only tested in internal network. • Do not actual exploit on unprivileve host • Hardware • PC or Workstation with UNIX-like system • Software • Wu-ftp 6.2.0 • RootKits and Buffer Overflow Program

  7. Step (I): reconnaissance and scanning Use “nmap” for system scanning Test the account of anonymous

  8. Step (II): exploit the target Decompress the buffer overflow file and compile it List the usage of this tool

  9. Step (III): cracking Execute the buffer overflow on target host Got the root right

  10. Step (IV) • Download the rootkit from outside and install it checking the login user Download the tool from another victim Decompress the rootkit Execute the rootkit

  11. Step (V): auto-patch the victim the default login password change the system command open the telnet port Report the system information close the system filewall

  12. Step (IV) • try the rootkit if it works • Now you can do anything The Telnet daemon has been replaced Input the ID and the Password Which predefine by us We have got a root shell now

  13. Summary • Checking the OS and applications’ vulnerability periodically. • Catch the idea of “Defense in Depth.”

  14. Reference • CERT • http://www.cert.org/ • Nmap • http://incsecure.org/ • Buffer Overflow and RootKits download site • http://www.flatline.org.uk/~pete/ids/

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