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From: jaf@sarastro.unb.ca (Tony Fitzgerald)
Newsgroups: comp.security.unix
Subject: Re: How to crack passwords ???
Date: 21 Oct 1997 23:36:51 -0300
Organization: University of New Brunswick, Fredericton
Lines: 42
Message-ID: <62jos3$dml@sarastro.unb.ca>
References: <01bcde45$ba4f4c40$2b2ec19d@dialup.rug.ac.be>
NNTP-Posting-Host: sarastro.unb.ca
Xref: news.beyond-the-illusion.com comp.security.unix:35376
In article <01bcde45$ba4f4c40$2b2ec19d@dialup.rug.ac.be>,
Pieter Martens wrote:
>Is there anybody who can tell me how to crack unix passwords ?
The following Perl script should crack all passwords on your system unless
you're using shadow passwords in which case it gets a little more
complicated:
#!/usr/local/bin/perl -w
open PW,"/etc/passwd" or die "$0: can't read: $!";
NXPW:
while() {
my($lgid,$crypt)= split/\:/;
my $seed= substr($crypt,0,2);
for($i=0;$i<=255;++$i) {
for($j=0;$j<=255;++$j) {
for($k=0;$k<=255;++$k) {
for($l=0;$l<=255;++$l) {
for($m=0;$m<=255;++$m) {
for($n=0;$n<=255;++$n) {
for($o=0;$o<=255;++$o) {
for($p=0;$p<=255;++$p) {
my $guess= pack('CCCCCCCC',$i,$j,$k,$l,$m,$n,$o,$p);
next unless $crypt eq crypt($guess,$seed);
print "password for $lgid is $guess\n"
next NXPW;
}
}
}
}
}
}
}
}
}
Just put the above into a file called "Cracker" then chmod the file 755
and issue the command Cracker and you're off to the races. I assume that
you're paying for the CPU usage on the system?
--
O- J. Anthony Fitzgerald, jaf@UNB.ca, http://www.unb.ca/csd/staff/jaf/ -O
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