CVE-2008-3595 in txtSQL
Summary
by MITRE
PHP remote file inclusion vulnerability in examples/txtSQLAdmin/startup.php in txtSQL 2.2 Final allows remote attackers to execute arbitrary PHP code via a URL in the CFG[txtsql][class] parameter.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability described in CVE-2008-3595 represents a critical remote file inclusion flaw in the txtSQL 2.2 Final web application that exposes the system to arbitrary code execution attacks. This issue specifically affects the examples/txtSQLAdmin/startup.php file where user input is improperly validated and directly incorporated into file inclusion operations without adequate sanitization measures. The vulnerability manifests when an attacker manipulates the CFG[txtsql][class] parameter with a malicious URL, enabling the application to fetch and execute remote PHP code on the target server. This type of vulnerability falls under the category of CWE-88, which describes improper neutralization of special elements used in an OS command, and more specifically aligns with CWE-94, which covers the execution of arbitrary code through the inclusion of untrusted data. The attack vector leverages the principle of insecure file inclusion where the application fails to validate the source and integrity of included files, creating a pathway for remote code execution that can compromise the entire web server infrastructure.
The technical exploitation of this vulnerability requires an attacker to craft a malicious payload that manipulates the CFG[txtsql][class] parameter to point to a remote server hosting malicious PHP code. When the vulnerable application processes this parameter, it performs a file inclusion operation that downloads and executes the remote code without proper validation. This flaw demonstrates a fundamental lack of input sanitization and proper access controls within the application's configuration handling mechanism. The vulnerability is particularly dangerous because it allows attackers to execute code with the privileges of the web server process, potentially leading to complete system compromise. The attack can be classified under the MITRE ATT&CK framework as a remote code execution technique that leverages web application vulnerabilities, specifically mapping to T1059.007 for the execution of code through PHP scripts. The impact extends beyond simple code execution to include potential data breaches, system reconnaissance, and the establishment of persistent backdoors that can be used for further attacks.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with unrestricted access to the affected web server and its underlying resources. Once exploited, an attacker can execute arbitrary commands on the server, potentially gaining access to sensitive data, modifying application files, or using the compromised server as a launchpad for attacks on other systems within the network. The vulnerability affects the confidentiality, integrity, and availability of the web application and the broader system infrastructure. Organizations running affected versions of txtSQL face significant risk of data compromise, service disruption, and potential regulatory violations if sensitive information is accessed or modified through this attack vector. The vulnerability also demonstrates the importance of proper parameter validation and input sanitization in web applications, as it represents a classic example of how insecure coding practices can lead to catastrophic security consequences. The flaw essentially removes the application's ability to properly validate user-supplied data, creating an attack surface that can be exploited without requiring authentication or specific system knowledge beyond the initial vulnerability identification.
Mitigation strategies for this vulnerability should focus on immediate patching and implementation of proper input validation controls. Organizations must update to a patched version of txtSQL that addresses the file inclusion flaw, while also implementing proper parameter sanitization and validation at all input points. The recommended approach includes disabling remote file inclusion features in PHP configuration, implementing strict input validation for all user-supplied parameters, and using whitelisting mechanisms to restrict file inclusion to trusted sources only. Network-level mitigations such as web application firewalls and intrusion prevention systems can provide additional layers of protection by monitoring for suspicious file inclusion patterns. Security best practices should include regular security audits, proper code review processes, and implementation of secure coding standards to prevent similar vulnerabilities from occurring in future development cycles. The vulnerability also underscores the importance of following secure development lifecycle practices and adhering to industry standards such as OWASP Top Ten and NIST cybersecurity frameworks to ensure robust protection against remote code execution threats. Organizations should also implement monitoring and logging mechanisms to detect potential exploitation attempts and establish incident response procedures to address successful attacks promptly.