CVE-2005-2412 in PHP FirstPost
Summary
by MITRE
PHP remote file inclusion vulnerability in block.php in PHP FirstPost allows remote attackers to execute arbitrary PHP code via the Include parameter.
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Analysis
by VulDB Data Team • 09/21/2025
The vulnerability identified as CVE-2005-2412 represents a critical remote file inclusion flaw in the PHP FirstPost application's block.php script. This vulnerability falls under the category of insecure direct object references and improper input validation, creating a pathway for malicious actors to execute arbitrary code on vulnerable systems. The flaw specifically manifests when the application fails to properly validate the Include parameter, allowing attackers to inject and execute malicious PHP code from remote locations. This type of vulnerability is classified as CWE-98 in the Common Weakness Enumeration catalog, which specifically addresses improper input validation leading to remote file inclusion attacks.
The technical implementation of this vulnerability stems from the application's reliance on user-supplied input without adequate sanitization or validation mechanisms. When the block.php script processes the Include parameter, it directly incorporates user-provided values into the file inclusion mechanism, bypassing proper security controls that should validate and sanitize all external inputs. This behavior creates an environment where attackers can manipulate the Include parameter to reference remote files hosted on attacker-controlled servers, effectively allowing them to execute malicious code within the context of the web application. The vulnerability operates at the application layer and requires no special privileges or access mechanisms, making it particularly dangerous for widespread exploitation.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to completely compromise the affected system. Successful exploitation can lead to full system control, data theft, and the ability to establish persistent backdoors within the target environment. The vulnerability affects web applications running PHP FirstPost versions prior to the patch release, creating a significant risk for organizations that have not updated their systems. The remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target network, making it an attractive target for automated scanning and exploitation tools. According to the MITRE ATT&CK framework, this vulnerability maps to the T1190 technique for exploitation of remote services and T1059 for execution of malicious code through command and scripting interpreter.
Organizations affected by this vulnerability should implement immediate mitigations including the application of vendor patches, input validation controls, and the implementation of web application firewalls to detect and block malicious requests. The recommended approach involves sanitizing all user inputs, particularly those used in file inclusion operations, and implementing proper access controls to prevent unauthorized file access. Additionally, organizations should consider implementing network segmentation and monitoring solutions to detect suspicious file inclusion patterns. The vulnerability demonstrates the critical importance of proper input validation and the principle of least privilege in web application security, as the flaw could have been prevented through basic security practices such as validating and sanitizing all external inputs before processing them within the application context.