Platform
php
Component
snews-cms
Fixed in
1.7.1
CVE-2016-20052 describes an unrestricted file upload vulnerability present in Snews CMS versions 1.7 through 1.7. This flaw allows unauthenticated attackers to upload arbitrary files, including potentially malicious PHP scripts, to the snews_files directory. Successful exploitation can lead to remote code execution, giving attackers control over the affected system. No official patch is currently available.
CVE-2016-20052 affects Snews CMS version 1.7, presenting an unrestricted file upload vulnerability. This allows unauthenticated attackers to upload arbitrary files, including malicious PHP scripts, to the 'snews_files' directory. The severity of this vulnerability is extremely high, with a CVSS score of 9.8, due to the possibility of remote code execution (RCE). An attacker can exploit this flaw by uploading a PHP file through the multipart form-data upload endpoint and then executing it by accessing the uploaded file path. This could result in complete server control, theft of sensitive data, or the installation of malware.
The vulnerability is exploited through the CMS's multipart form-data upload endpoint. An attacker can craft an HTTP request including a malicious PHP file as part of the multipart data. The CMS, failing to properly validate the file type or content, allows the upload. Once uploaded, the attacker can access the file via its URL, triggering the malicious PHP code execution on the server. The lack of authentication means anyone with network access can exploit this vulnerability.
Exploit Status
EPSS
0.26% (50% percentile)
CISA SSVC
CVSS Vector
Unfortunately, no official fix has been released for CVE-2016-20052 by the Snews CMS developer. The primary mitigation is to upgrade to a more secure version of the CMS if available. If upgrading is not possible, implementing additional security measures is recommended, such as restricting access to the 'snews_files' directory through a firewall, disabling PHP script execution in that directory (if possible), and actively monitoring uploaded files for suspicious activity. Regular security audits are also crucial to identify and address potential vulnerabilities.
Actualice a una versión corregida de Snews CMS que solucione la vulnerabilidad de carga de archivos sin restricciones. Verifique y restrinja los permisos de escritura en el directorio snews_files para evitar la ejecución de archivos maliciosos. Implemente una validación robusta de los tipos de archivo y tamaños permitidos en el endpoint de carga.
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RCE stands for 'Remote Code Execution'. It's a vulnerability that allows an attacker to execute arbitrary code on a remote server.
If you are using Snews CMS version 1.7, you are likely vulnerable. You can attempt to upload a test PHP file to verify, but be careful not to damage your website.
Vulnerability scanners can detect CVE-2016-20052. You can also search exploit repositories for proof-of-concept scripts.
If you suspect your website has been compromised, isolate it immediately from the network, change all passwords, and perform a comprehensive security audit.
A CMS (Content Management System) is a system for creating and managing digital content. It allows users to build and modify content on a website without specialized technical knowledge.
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