CVE-2006-6883 in Phpirc Bot
Summary
by MITRE
** DISPUTED ** PHP remote file inclusion vulnerability in php4you.php in PHPIrc_bot 0.2 allows remote attackers to execute arbitrary PHP code via a URL in the dir parameter. NOTE: this issue is disputed by CVE, since the dir variable is declared before being used.
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Analysis
by VulDB Data Team • 08/08/2024
The vulnerability described in CVE-2006-6883 represents a potential remote file inclusion flaw within the PHPIrc_bot 0.2 web application, specifically affecting the php4you.php component. This issue falls under the category of insecure direct object references and remote code execution vulnerabilities that have historically plagued web applications. The vulnerability arises from improper input validation and sanitization within the application's parameter handling mechanisms, creating an attack surface where malicious actors can manipulate the dir parameter to inject arbitrary URLs. The disputed nature of this CVE stems from the observation that the dir variable appears to be declared before its usage, suggesting that the vulnerability may not exist as originally reported or that the exploitation conditions are more complex than initially stated.
The technical implementation of this vulnerability involves the manipulation of the dir parameter through HTTP requests to the affected php4you.php script. When an attacker supplies a malicious URL as the value for the dir parameter, the application processes this input without adequate validation, potentially leading to the inclusion of remote files containing malicious PHP code. This type of vulnerability directly maps to CWE-829, which describes insecure inclusion of dynamic code, and aligns with the broader category of CWE-94, representing execution of arbitrary code. The attack vector typically involves crafting a specially formatted URL that, when processed by the vulnerable application, results in the remote code execution. This represents a critical security risk as it allows attackers to execute arbitrary commands on the server hosting the vulnerable application.
From an operational perspective, the impact of this vulnerability extends beyond simple code execution to encompass potential complete system compromise. Attackers exploiting this flaw could gain unauthorized access to sensitive server resources, manipulate data, and potentially establish persistent backdoors within the compromised environment. The vulnerability's presence in PHPIrc_bot 0.2 indicates a broader class of issues affecting older web applications that may lack proper input validation mechanisms. The remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target system, making it particularly dangerous for publicly accessible web applications. Organizations running vulnerable versions of this software face significant risk of data breaches, service disruption, and regulatory compliance violations.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the affected application. The recommended approach involves eliminating the use of user-supplied input directly in file inclusion operations and implementing strict parameter validation before any processing occurs. Security measures should include disabling remote file inclusion features, implementing proper access controls, and ensuring that all input parameters are validated against a whitelist of acceptable values. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious activity patterns associated with remote file inclusion attacks. Additionally, regular security assessments and code reviews should be conducted to identify and remediate similar vulnerabilities throughout the application's codebase, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in web applications. The disputed nature of this CVE suggests that careful analysis of the actual code behavior is necessary to determine the true exploitability and remediation requirements.