CVE-2017-6070 in CMS Made Simple
Summary
by MITRE
CMS Made Simple version 1.x Form Builder before version 0.8.1.6 allows remote attackers to execute PHP code via the cntnt01fbrp_forma_form_template parameter in admin_store_form.
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Analysis
by VulDB Data Team • 08/16/2020
The vulnerability identified as CVE-2017-6070 represents a critical remote code execution flaw within CMS Made Simple's Form Builder module. This issue affects versions 1.x of the CMS platform prior to 0.8.1.6 and specifically targets the admin_store_form endpoint where user input is processed without adequate sanitization. The vulnerability stems from improper handling of the cntnt01fbrp_forma_form_template parameter, which allows malicious actors to inject and execute arbitrary PHP code on the affected server. This type of vulnerability falls under CWE-94, which describes improper validation of a control flow modification, and aligns with ATT&CK technique T1190 for exploitation of remote services.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious payload containing PHP code within the cntnt01fbrp_forma_form_template parameter and submits it through the admin_store_form endpoint. Due to insufficient input validation and sanitization mechanisms, the application processes this parameter directly without proper escaping or encoding, allowing the injected PHP code to execute within the context of the web server. This creates a persistent backdoor or allows attackers to gain full control over the web application and underlying server infrastructure. The vulnerability is particularly dangerous because it operates at the application level and can be exploited by unauthenticated users, making it highly accessible to attackers.
The operational impact of CVE-2017-6070 extends beyond immediate code execution capabilities to encompass complete system compromise and data breaches. Once exploited, attackers can establish persistent access, escalate privileges, and potentially move laterally within network environments. The vulnerability affects organizations using outdated CMS Made Simple installations, creating a significant risk for web applications that have not implemented proper patch management procedures. This type of vulnerability directly impacts the confidentiality, integrity, and availability of affected systems, as attackers can modify web content, steal sensitive data, or disrupt services entirely. Organizations may face regulatory compliance violations and reputational damage when such vulnerabilities are exploited.
Mitigation strategies for CVE-2017-6070 must focus on immediate patching and implementation of additional security controls. The primary remediation involves upgrading to CMS Made Simple Form Builder version 0.8.1.6 or later, which includes proper input validation and sanitization mechanisms. Organizations should also implement web application firewalls to monitor and filter malicious requests targeting the affected endpoint. Input validation should be strengthened at multiple layers, including application-level filtering, parameterized queries, and proper output encoding. Security monitoring should include detection of unusual parameter patterns and anomalous code execution attempts. Additionally, implementing principle of least privilege access controls and regular security audits can help prevent exploitation and detect potential compromise. The vulnerability demonstrates the critical importance of maintaining up-to-date software versions and implementing comprehensive security practices to protect against remote code execution threats.