CVE-2019-7692 in CIM
Summary
by MITRE
install/install.php in CIM 0.9.3 allows remote attackers to execute arbitrary PHP code via a crafted prefix value because of configuration file mishandling in the N=83 case, as demonstrated by a call to the PHP fputs function that creates a .php file in the public folder.
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Analysis
by VulDB Data Team • 07/09/2023
The vulnerability identified as CVE-2019-7692 resides within the installation component of CIM version 0.9.3, specifically in the install.php file. This represents a critical security flaw that enables remote attackers to achieve arbitrary code execution on affected systems. The vulnerability stems from improper handling of configuration parameters during the installation process, creating a pathway for malicious actors to inject and execute PHP code remotely without authentication. The flaw manifests when a crafted prefix value is provided during installation, which bypasses normal input validation mechanisms and allows attackers to manipulate the system's file creation processes.
The technical implementation of this vulnerability occurs through a specific code path where the system processes the prefix parameter in what is termed the N=83 case. This particular handling mechanism fails to properly sanitize or validate the input before using it to construct file paths or execute system calls. The exploitation involves a call to the PHP fputs function which creates a .php file in the public folder of the web server. This file creation represents a critical escalation point because it allows attackers to place executable PHP code within the web root directory, effectively enabling them to run arbitrary commands on the server. The vulnerability is particularly dangerous because it leverages legitimate system functions while bypassing normal security controls that would typically prevent such file creation operations.
The operational impact of CVE-2019-7692 extends far beyond simple code execution, as it provides attackers with complete control over the affected system. Once successful, the vulnerability allows for full system compromise including data theft, persistent backdoor installation, and potential lateral movement within network environments. The attack surface is significant since the vulnerability exists during the installation phase, meaning it can be exploited before the system is fully configured or secured. This makes it particularly dangerous for organizations deploying the software, as the window of opportunity for exploitation exists during the most vulnerable phase of system setup. The vulnerability affects any system running CIM 0.9.3 where the installation process is accessible to remote attackers, potentially compromising entire web applications and their underlying infrastructure.
From a cybersecurity framework perspective, this vulnerability maps directly to CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PHP." The flaw represents a classic example of insecure input handling and improper validation of user-supplied data in web applications. Organizations should implement immediate mitigations including patching to the latest version of CIM, disabling the installation script after initial setup, and implementing network segmentation to prevent unauthorized access to installation endpoints. Additionally, input validation should be strengthened at all levels, particularly during configuration and installation phases, to prevent similar vulnerabilities from being exploited in other components of the system. The vulnerability highlights the critical importance of validating all user inputs and ensuring that configuration processes do not create executable files in publicly accessible directories.