CVE-2006-6213 in PEGames
Summary
by MITRE
index.php in PEGames uses the extract function to overwrite critical variables, which allows remote attackers to conduct PHP remote file inclusion attacks via the abs_url parameter, which is later extracted to overwrite a previously uncontrolled value.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/21/2024
The vulnerability described in CVE-2006-6213 represents a critical security flaw in the PEGames web application that stems from improper input validation and unsafe variable handling practices. This vulnerability specifically affects the index.php file where the extract function is employed without adequate sanitization measures, creating a pathway for remote attackers to manipulate critical application variables. The flaw exists within the application's parameter processing logic where user-supplied input from the abs_url parameter is directly processed through the extract function without proper validation or filtering.
The technical implementation of this vulnerability leverages the PHP extract function's behavior of creating variables from array elements or other data sources. When the abs_url parameter is passed to the application, it gets processed through extract() without proper input sanitization, allowing attackers to inject malicious values that overwrite existing variables within the application's scope. This creates a scenario where attackers can manipulate the application's execution flow by overwriting critical variables such as include paths, configuration settings, or other essential runtime parameters. The vulnerability essentially enables a form of variable injection that can be exploited to achieve remote code execution or arbitrary file inclusion.
The operational impact of this vulnerability is severe as it allows remote attackers to conduct PHP remote file inclusion attacks without requiring authentication or local access. Attackers can leverage this weakness to include and execute arbitrary PHP code from remote servers, potentially leading to complete system compromise. The vulnerability affects the application's integrity and confidentiality by enabling unauthorized access to sensitive data and system resources. This type of attack can result in data breaches, system infiltration, and the potential for establishing persistent backdoors within the affected environment. The remote nature of the exploit means that attackers can target the vulnerability from anywhere on the internet, making it particularly dangerous for publicly accessible web applications.
Security mitigation strategies for this vulnerability should focus on eliminating the unsafe use of the extract function and implementing proper input validation mechanisms. Organizations should avoid using extract() with untrusted input or ensure that all variables are properly sanitized before processing. The recommended approach involves implementing strict parameter validation, using allowlists for acceptable input values, and avoiding the direct extraction of user-supplied data into the application's variable scope. Additionally, implementing proper input sanitization techniques such as using filter_var() with appropriate filters, employing prepared statements for database operations, and following secure coding practices that align with the CWE-1074 standard for improper neutralization of special elements used in an OS command. The vulnerability also relates to ATT&CK technique T1190 which involves exploiting vulnerabilities in web applications to establish remote access, making proper patch management and secure coding practices essential for defense. Organizations should also implement network segmentation, web application firewalls, and regular security assessments to detect and prevent exploitation attempts. The vulnerability demonstrates the importance of following secure coding guidelines and avoiding deprecated or unsafe programming practices that can create attack vectors for remote exploitation.