CVE-2017-11585 in FineCMS
Summary
by MITRE
dayrui FineCms 5.0.9 has remote PHP code execution via the param parameter in an action=cache request to libraries/Template.php, aka Eval Injection.
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Analysis
by VulDB Data Team • 10/31/2019
The vulnerability identified as CVE-2017-11585 represents a critical remote code execution flaw within the dayrui FineCms 5.0.9 content management system. This vulnerability exists in the libraries/Template.php file where the param parameter is processed without adequate sanitization or validation, creating a dangerous attack vector that allows remote adversaries to inject and execute arbitrary PHP code on the target system. The flaw specifically manifests when an attacker crafts a malicious request to the action=cache endpoint, leveraging the param parameter to bypass normal input validation mechanisms and directly inject malicious code into the application's execution flow.
The technical nature of this vulnerability aligns with CWE-94, which describes the improper execution of code due to the injection of untrusted data into a code execution context. This represents a classic eval injection vulnerability where user-controllable input is passed directly to the eval() function or similar code execution mechanisms within the application's template processing logic. The attack exploits the lack of proper input validation and sanitization, allowing attackers to execute arbitrary PHP commands with the privileges of the web application process. This creates a severe risk as the attacker can potentially gain full control over the web server, access sensitive data, or use the compromised system as a pivot point for further attacks within the network infrastructure.
The operational impact of this vulnerability extends far beyond simple code execution, as it fundamentally compromises the integrity and confidentiality of the affected system. An attacker who successfully exploits this vulnerability can perform a wide range of malicious activities including data exfiltration, privilege escalation, persistence establishment, and lateral movement within the network. The vulnerability affects the application's template processing functionality, which is typically a core component responsible for rendering dynamic content, making it a high-value target for exploitation. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the internet without requiring local access or prior authentication, significantly increasing the attack surface and potential impact. This vulnerability also aligns with ATT&CK technique T1059.007 for Windows command and scripting interpreter, as the exploitation involves PHP code execution that can be leveraged to establish command and control capabilities.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements. The most effective immediate solution involves applying the vendor-supplied patch or upgrading to a non-vulnerable version of FineCms, which would fix the input validation and sanitization issues in the Template.php file. Organizations should implement proper input validation and sanitization measures, ensuring that all user-controllable parameters are thoroughly validated before processing. The implementation of a web application firewall (WAF) with rules specifically designed to detect and block malicious param parameter values can provide additional protection layers. Network segmentation and access control measures should be enforced to limit the potential impact of successful exploitation, while regular security audits and penetration testing can help identify similar vulnerabilities in other components of the application stack. Additionally, implementing proper logging and monitoring of cache-related activities can help detect exploitation attempts and provide forensic evidence for incident response activities.