CVE-2007-1372 in PostGuestbook
Summary
by MITRE
PHP remote file inclusion vulnerability in styles/internal/header.php in the PostGuestbook 0.6.1 module for PHP-Nuke allows remote attackers to execute arbitrary PHP code via a URL in the tpl_pgb_moddir parameter.
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Analysis
by VulDB Data Team • 08/26/2024
The vulnerability identified as CVE-2007-1372 represents a critical remote file inclusion flaw within the PostGuestbook 0.6.1 module for PHP-Nuke systems. This security weakness resides in the styles/internal/header.php file where the application fails to properly validate user input before incorporating it into file paths. The vulnerability specifically affects the tpl_pgb_moddir parameter which is used to determine the template directory for the guestbook module. Attackers can exploit this flaw by manipulating the parameter to include malicious URLs, thereby enabling remote code execution on the affected server. This type of vulnerability falls under the category of CWE-88, which describes improper neutralization of special elements used in an expression, and represents a classic example of a remote code execution vulnerability that can be exploited through parameter manipulation. The flaw demonstrates poor input validation practices and highlights the dangers of directly incorporating user-supplied data into server-side file operations without proper sanitization.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious request containing a URL in the tpl_pgb_moddir parameter that points to a remote server hosting malicious PHP code. When the vulnerable application processes this parameter, it attempts to include and execute the remote file, effectively allowing the attacker to run arbitrary PHP commands on the target system. The attack vector demonstrates the dangerous practice of concatenating user input directly into file inclusion functions without proper validation or sanitization. This vulnerability is particularly concerning because it can be exploited from any remote location without requiring authentication, making it a severe threat to web application security. The issue is further compounded by the fact that the PostGuestbook module was commonly installed in PHP-Nuke environments, increasing the potential attack surface.
The operational impact of this vulnerability extends beyond simple code execution to encompass full system compromise and data breach potential. Successful exploitation allows attackers to gain complete control over the affected web server, enabling them to install backdoors, steal sensitive data, modify existing files, or even use the compromised system as a launching point for attacks on other networked systems. The vulnerability can result in unauthorized access to database credentials, user information, and potentially sensitive business data stored within the web application. From an attacker's perspective, this represents a high-value target as it provides persistent access to the server environment. The vulnerability also demonstrates the importance of secure coding practices and proper input validation, as the flaw could have been easily prevented through proper parameter sanitization and validation mechanisms. Organizations using vulnerable versions of PHP-Nuke with the PostGuestbook module were exposed to significant risk of unauthorized access and system compromise.
Mitigation strategies for this vulnerability require immediate patching of the affected software components and implementation of proper input validation measures. System administrators should upgrade to patched versions of PHP-Nuke and the PostGuestbook module to address the vulnerability. Additionally, implementing proper parameter validation and sanitization techniques can prevent similar issues in other applications. The recommended security controls include disabling remote file inclusion functionality where possible, implementing strict input validation for all user-supplied parameters, and using allowlists for acceptable file paths. Organizations should also consider implementing web application firewalls to detect and block malicious requests targeting known vulnerability patterns. From a compliance standpoint, this vulnerability highlights the importance of regular security assessments and patch management procedures. The ATT&CK framework categorizes this type of vulnerability under T1190 for Exploit Public-Facing Application, emphasizing the need for proper application hardening and input validation. Regular security audits and code reviews should be conducted to identify and remediate similar issues in other applications, ensuring that user input is never directly trusted in file inclusion operations.