CVE-2018-10236 in POSCMS
Summary
by MITRE
POSCMS 3.2.18 allows remote attackers to execute arbitrary PHP code via the diy\dayrui\controllers\admin\Syscontroller.php 'add' function because an attacker can control the value of $data['name'] with no restrictions, and this value is written to the FCPATH.$file file.
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Analysis
by VulDB Data Team • 01/30/2020
The vulnerability CVE-2018-10236 affects POSCMS version 3.2.18 and represents a critical remote code execution flaw that enables attackers to execute arbitrary PHP code on affected systems. This vulnerability resides within the diy\dayrui component of the content management system, which appears to be a module or plugin functionality designed for custom development or dynamic content generation. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly filter user-supplied data before processing it within the PHP execution environment. Attackers can exploit this vulnerability by crafting malicious payloads through the diy\dayrui interface, potentially leading to complete system compromise and unauthorized access to sensitive data.
The technical nature of this vulnerability aligns with CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and falls under the broader category of injection flaws that allow attackers to execute arbitrary code on target systems. This weakness enables attackers to inject malicious PHP code that gets executed within the web server context, bypassing normal security controls and authentication mechanisms. The vulnerability's remote exploitability means that attackers do not require physical access or local system credentials to leverage this flaw, making it particularly dangerous for publicly accessible web applications. The attack vector likely involves submitting specially crafted parameters or data through the diy\dayrui functionality that gets processed without proper sanitization, leading to code execution on the server.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete control over the affected POSCMS installation. Once exploited, attackers can execute arbitrary commands, access sensitive files, modify content, steal user data, and potentially use the compromised system as a launch point for further attacks within the network infrastructure. The vulnerability affects the confidentiality, integrity, and availability of the web application and underlying systems, as attackers can manipulate the content management system to serve malicious payloads, delete important data, or disrupt normal operations. Organizations using POSCMS 3.2.18 are particularly at risk since this vulnerability can be exploited from external networks, making it a prime target for automated scanning and exploitation campaigns targeting known vulnerabilities in content management systems.
Mitigation strategies for CVE-2018-10236 should prioritize immediate patching of the affected POSCMS version to the latest available release that addresses this vulnerability. System administrators should also implement network-level controls including firewall rules that restrict access to the diy\dayrui functionality and monitor for suspicious traffic patterns that may indicate exploitation attempts. Input validation should be strengthened across all user-facing interfaces to prevent malicious code injection, while the principle of least privilege should be enforced to limit the damage that could occur even if exploitation succeeds. Organizations should conduct thorough security assessments of their web applications, implement proper logging and monitoring mechanisms, and consider deploying web application firewalls to detect and block malicious requests targeting this vulnerability. Additionally, regular security updates and vulnerability scanning should be maintained to identify and remediate similar weaknesses in other components of the system infrastructure.