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work for specific kernel versions Moreover, many of the data structures and APIs within many operating system kernels are constantly evolving The net result is a not-sostraightforward process that will require some effort in order to get a rootkit to work for your system For example, the enyelkm rootkit, which will be discussed in detail momentarily, is written for the 26x series, but will not compile on the latest builds due to ongoing changes within the kernel In order to make this work, the rootkit required some code modification By far the most popular method for loading kernel rootkits is as a kernel module Typically, a loadable kernel module (LKM) is used to load additional functionality into a running kernel without compiling this feature directly into the kernel This functionality enables the loading and unloading of kernel modules when needed, while decreasing the size of the running kernel Thus, a small, compact kernel can be compiled and modules loaded when they are needed Many UNIX flavors support this feature, including Linux, FreeBSD, and Solaris This functionality can be abused with impunity by an attacker to completely manipulate the system and all processes Instead of LKMs being used to load device drivers for items such as network cards, LKMs will instead be used to intercept system calls and modify them in order to change how the system reacts to certain commands Many rootkits such as knark, adore, and enyelkm inject themselves in this manner As the LKM rootkits grew in popularity, UNIX administrators became increasingly concerned with the risk created from leaving the LKM feature enabled As part of standard build practice, many began disabling LKM support as a precaution Unsurprisingly, this caused rootkit authors to search for new methods of injection Chris Silvio identified a new way of accomplishing this through raw memory access His approach reads and writes directly to kernel memory through /dev/kmem and does not require LKM support In the 58th issue of Phrack Magazine, Silvio released a proof of concept, SucKIT, for Linux 22x and 24x kernels Silvio s work inspired others, and several rootkits have been written that inject themselves in the same manner Among them, Mood-NT provides many of the same features as SucKIT and extends support for the 26x kernel Because of the security implications of the /dev/kmem interface, many have questioned the need for enabling interface by default Subsequently, many distributions such as Ubuntu, Fedora, Red Hat, and OS X are disabling or phasing out support altogether As support for /dev/kmem began to disappear, rootkit authors turned to /dev/mem to do their dirty work The phalanx rootkit is credited as the first publicly known rootkit to operate in this manner Hopefully, you now have an understanding of injection methods and some of the history on how they came about Let s now turn our attention to interception techniques One of the oldest and least sophisticated approaches is direct modification of the system call table That is to say, system calls are replaced by changing the corresponding address pointers within the system call table This is an older approach and changes to the system call table can easily be detected with integrity checkers Nevertheless, it is worth.

/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

TABLE 6-7 Motor Power Output Comparison Watts Output 0746 1492 294 448 597 746 933 1068 1119 1194 1492 1865 2238 2490 2611 2980 3730 4970 6017 7460 mhp * 1 2 4 6 8 10 125 143 15 16 20 25 30 33 35 40 50 hp 1/1000 1/500 1/250 1/170 1/125 1/100 1/80 1/70 1/65 1/60 1/50 1/40 1/35 1/30 1/25 1/20 1/15 1/12 1/10

5:

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

8: