CVE-2006-6633 in yapbb
Summary
by MITRE
PHP remote file inclusion vulnerability in include/yapbb_session.php in YapBB 1.2 Beta2 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the GLOBALS[include_Bit] parameter.
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Analysis
by VulDB Data Team • 07/30/2024
The vulnerability identified as CVE-2006-6633 represents a critical remote file inclusion flaw within the YapBB 1.2 Beta2 bulletin board system and earlier versions. This vulnerability exists in the include/yapbb_session.php file where the application fails to properly validate user input before incorporating it into the execution flow. The flaw specifically manifests when the GLOBALS[include_Bit] parameter is manipulated by an attacker, allowing malicious code execution through remote file inclusion techniques.
This vulnerability falls under the Common Weakness Enumeration category CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of command and buffer injection. The technical implementation of this flaw occurs because the application directly uses user-supplied input without adequate sanitization or validation, creating an environment where remote attackers can inject malicious URLs that get executed as PHP code. The vulnerability is particularly dangerous because it allows attackers to include arbitrary files from remote servers, effectively bypassing local security controls.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with full control over the affected system. An attacker can leverage this flaw to upload and execute malicious PHP scripts, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability affects web applications running YapBB 1.2 Beta2 and earlier versions, making it particularly concerning given that this was a widely used bulletin board system during the mid-2000s. The attack vector requires minimal privileges and can be executed remotely, making it highly exploitable in automated attack scenarios.
Mitigation strategies for CVE-2006-6633 should focus on immediate patching of the affected software to the latest available version where the vulnerability has been addressed. System administrators should implement proper input validation and sanitization mechanisms, ensuring that all user-supplied parameters are rigorously checked before being used in file inclusion operations. The principle of least privilege should be enforced, with web applications running with minimal required permissions. Additionally, network segmentation and firewall rules should be implemented to restrict access to vulnerable applications. According to ATT&CK framework, this vulnerability aligns with T1190 - Exploit Public-Facing Application, which emphasizes the importance of securing web applications against remote code execution attacks. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability class.