CVE-2006-6830 in b2 Blog
Summary
by MITRE
PHP remote file inclusion vulnerability in b2verifauth.php in b2 Blog 0.5 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the index parameter.
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Analysis
by VulDB Data Team • 07/27/2025
The vulnerability identified as CVE-2006-6830 represents a critical remote file inclusion flaw in the b2 Blog 0.5 content management system that exposes systems to arbitrary code execution attacks. This vulnerability specifically affects the b2verifauth.php script where the index parameter is processed without proper input validation, creating an exploitable condition that allows malicious actors to inject and execute remote PHP code. The flaw stems from improper sanitization of user-supplied input, enabling attackers to manipulate the application's behavior through crafted URLs.
This vulnerability maps directly to CWE-88, which describes the weakness of allowing command injection through improper input validation, and aligns with ATT&CK technique T1190 for exploitation of remote services. The technical implementation involves the application's failure to validate or sanitize the index parameter before using it in file inclusion operations, creating a path where attacker-controlled content can be executed within the application context. The vulnerability exists at the application logic level where user input is directly incorporated into file path resolution without adequate security controls.
The operational impact of this vulnerability is severe as it provides remote attackers with complete system compromise capabilities. An attacker can leverage this flaw to execute arbitrary PHP code on the target server, potentially leading to full system takeover, data exfiltration, and persistence mechanisms. The vulnerability affects all versions of b2 Blog 0.5 and earlier, making it particularly dangerous for systems that have not been updated to patched versions. The attack surface is broad since the flaw occurs in a core authentication verification script that handles user access control.
Mitigation strategies for this vulnerability include immediate patching of the b2 Blog application to version 0.6 or later where the vulnerability has been addressed through proper input validation. System administrators should implement input sanitization measures to validate all user-supplied parameters before processing, particularly those used in file inclusion operations. Network-level protections such as web application firewalls can provide additional defense-in-depth by monitoring for suspicious URL patterns and blocking requests containing potentially malicious file inclusion attempts. Additionally, the principle of least privilege should be enforced by limiting the web server's file access permissions and ensuring that the application operates with minimal required privileges to reduce the potential impact of successful exploitation.