CVE-2007-2664 in Yet Another Asterisk Panel
Summary
by MITRE
PHP remote file inclusion vulnerability in includes/common.php in Yaap 1.5 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the root_path parameter, possibly related to the __autoload function.
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Analysis
by VulDB Data Team • 09/15/2024
The vulnerability identified as CVE-2007-2664 represents a critical remote file inclusion flaw in the Yaap content management system version 1.5 and earlier. This vulnerability exists within the includes/common.php file and specifically targets the root_path parameter, creating an avenue for remote attackers to execute arbitrary PHP code on the affected system. The flaw stems from improper input validation and sanitization mechanisms that fail to properly restrict user-supplied data from being used in file inclusion operations. The vulnerability is particularly dangerous because it allows attackers to inject malicious URLs that are then processed by the application's file handling mechanisms, potentially leading to complete system compromise.
The technical implementation of this vulnerability leverages the PHP __autoload function, which is designed to automatically load classes when they are referenced. However, in this case, the application fails to validate or sanitize the root_path parameter before using it in file inclusion operations. When an attacker supplies a malicious URL as the root_path value, the __autoload function processes this input without proper validation, effectively allowing the execution of arbitrary PHP code from remote locations. This type of vulnerability falls under CWE-98, which describes improper restriction of operations within a single software component, and specifically relates to CWE-88, which addresses improper neutralization of special elements used in an expression. The vulnerability demonstrates a classic path traversal and remote code execution pattern where user input directly influences file system operations.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete control over the affected web server. Once exploited, attackers can execute arbitrary commands, access sensitive data, install backdoors, and potentially use the compromised system as a launch point for further attacks within the network. The vulnerability's remote nature means that exploitation can occur from anywhere on the internet without requiring local system access or authentication. Organizations running affected versions of Yaap are at significant risk of data breaches, service disruption, and potential regulatory compliance violations. The attack vector is particularly concerning because it can be exploited through simple HTTP requests, making it accessible to attackers with minimal technical expertise. According to ATT&CK framework, this vulnerability maps to T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter, as it allows for remote code execution through web application exploitation.
Mitigation strategies for CVE-2007-2664 require immediate action to address the root cause of the vulnerability. The primary recommendation involves upgrading to a patched version of Yaap that properly validates and sanitizes the root_path parameter before using it in file inclusion operations. Organizations should implement input validation controls that reject malicious URLs and ensure that all user-supplied input is properly escaped or encoded before being processed. Additionally, disabling the __autoload function or implementing strict whitelisting mechanisms for file paths can provide additional protection layers. Network-level defenses should include web application firewalls that can detect and block suspicious URL patterns targeting this vulnerability. Security administrators should also implement proper access controls and monitor web server logs for unusual file inclusion patterns. The vulnerability's exploitation can be prevented by ensuring that the PHP configuration does not allow remote file inclusion operations, and by implementing proper parameter validation throughout the application's codebase. Regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other applications and ensure that the mitigation measures remain effective over time.