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U TFTP Countermeasure is configured to restrict access to specific directories such as Ensure that the TFTP server
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TFTP, or Trivial File Transfer Protocol, is typically used to boot diskless workstations or network devices such as routers TFTP is a UDP-based protocol that listens on port 69 and provides very little security Many times attackers will locate a system with a TFTP server enabled and attempt to TFTP a copy of the /etc/passwd file back to their system If the TFTP server is configured incorrectly, the target system will happily give up the /etc/passwd file The attackers now have a list of usernames that can be brute forced If the password file wasn t shadowed, the attackers have the usernames and encrypted passwords that may allow the attackers to crack or guess user passwords Many newer versions of TFTP are configured by default to prohibit access to any directory except /tftpboot This a good step, but it is still possible for attackers to pull back any file in the /tftpboot directory This includes pulling back sensitive router configuration files by guessing the router configuration filename, which is usually <hostname of the router>cfg In many cases, the intruder would gain access to the router passwords and SNMP community strings We have seen entire networks compromised in the span of hours just by TFTPing router configuration files from an insecure TFTP server The configuration files were used to recover router passwords and SNMP community strings that happened to be identical for every device on the network
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/tftpboot This will prevent attackers from trying to pull back sensitive system-configuration files Additionally, consider implementing network- and host-based access-control mechanisms to prevent unauthorized systems from accessing the TFTP server
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FTP, or File Transfer Protocol, is one of the most common protocols used today It allows you to upload and download files from remote systems FTP is often abused to gain access to remote systems or to store illegal files Many FTP servers allow anonymous access, enabling any user to log in to the FTP server without authentication Typically the file system is restricted to a particular branch in the directory tree On occasion, however, an anonymous FTP server will allow the user to traverse the entire directory structure Thus, attackers can begin to pull down sensitive configuration files such as /etc/passwd To compound this situation, many FTP servers have world-writable directories A world-writable directory combined with anonymous access is a security incident waiting to happen Attackers may be able to place an rhosts file in a user s home directory, allowing the attackers to rlogin to the target system Many FTP servers are abused by software pirates who store illegal booty in hidden directories If your network utilization triples in a day, it might be a good indication that your systems are being used for moving the latest warez In addition to the risks associated with allowing anonymous access, FTP servers have had their fair share of security problems related to buffer overflow conditions and other insecurities One of the latest FTP vulnerabilities has been discovered in systems running wu-ftpd 260 and earlier versions (ftp://ftpauscertorgau/pub/auscert/advisory/ AA-200002) The wu-ftpd site exec vulnerability is related to improper validation of arguments in several function calls that implement the site exec functionality The site exe functionality enables users logged in to an FTP server to execute a restricted set of commands However, it is possible for an attacker to pass special characters consisting of carefully constructed printf()conversion characters (%f, %p, %n, and so on) to execute arbitrary code as root Let s take a look at this attack launched against a stock RedHat 62 system
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[thunder]# wugod -t 192168110 -s0 Target: 192168110 (ftp/<shellcode>): RedHat 62 ( ) with wuftpd 260(1) from rpm Return Address: 0x08075844, AddrRetAddr: 0xbfffb028, Shellcode: 152 loggin into system USER ftp 331 Guest login ok, send your complete e-mail address as password PASS <shellcode> 230-Next time please use your e-mail address as your password 230for example: joe@thunder 230 Guest login ok, access restrictions apply
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