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mentioning for background and completeness The knark rootkit, which is a modulebased rootkit, used this method for intercepting system calls Alternatively, a rootkit can modify the system call handler that calls the system call table to call its own system call table In this way, the rootkit can avoid changing the system call table This requires altering kernel functions during runtime The SucKIT rootkit loaded via /dev/kmem and previously discussed uses this method for intercepting system calls Similarly, the enyelkm loaded via a kernel module salts the syscall and sysenter_entry handlers Enye was originally developed by Raise and is an LKM-based rootkit for the Linux 26x series kernels The heart of the package is the kernel module enyelkmko To load the module, attackers use the kernel module loading utility modprobe:

Popularity: Simplicity: Impact: Risk Rating: 8 7 8 8

Some of the features included in enyelkm include: Hides les, directories, and processes Hides chunks within les Hides module from lsmod Provides root access via kill option Provides remote access via special ICMP request and reverse shell Let s take a look at one of the features the enyelkm rootkit provides As mentioned earlier, this rootkit had to be modified to compile on the kernel included in the Ubuntu 804 release

.

[schism]:~$ uname a Linux schism 2624-16-server #1 SMP Thu Apr 10 13:58:00 UTC 2008 i686 GNU/Linux [schism]$ id uid=1000(nathan) gid=1000(nathan) groups=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip), 44(video),46(plugdev),107(fuse),111(lpadmin),112(admin),1000(nathan) [schism]:~$ kill -s 58 12345 [schism]:~$ id uid=0(root) gid=0(root) groups=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip), 44(video),46(plugdev),107(fuse),111(lpadmin),112(admin),1000(nathan) [schism]$

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.

This feature provides us with quick root access via special arguments passed to the kill command When the request is processed, it is passed to the kernel where our module rootkit module lies in wait and intercepts The rootkit will recognize the special request and perform the appropriate action, in this case elevation of privileges Another method for intercepting system calls is via interrupts When an interrupt is triggered, the sequence of execution is altered and execution moves to the appropriate

[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