CVE-2006-6841 in phpBB
Summary
by MITRE
Certain forms in phpBB before 2.0.22 lack session checks, which has unknown impact and remote attack vectors.
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Analysis
by VulDB Data Team • 07/13/2019
The vulnerability identified as CVE-2006-6841 affects phpBB versions prior to 2.0.22 and represents a critical session management flaw that undermines the application's security posture. This issue specifically targets certain forms within the phpBB forum software where session validation mechanisms are absent or insufficient, creating a pathway for unauthorized users to manipulate the application's behavior. The vulnerability is classified under CWE-613, which deals with insufficient session expiration, and represents a fundamental breakdown in the authentication and authorization controls that should protect forum operations from unauthorized access. The absence of session checks on specific forms means that any attacker who can access these particular pages can potentially perform actions as if they were authenticated users, regardless of their actual authentication status.
The technical exploitation of this vulnerability occurs through the manipulation of web forms that should require valid session tokens to process user requests. When phpBB fails to validate session integrity on certain forms, it allows attackers to submit requests without proper authentication verification, potentially enabling actions such as posting messages, modifying user settings, or accessing restricted administrative functions. This flaw operates at the application layer and can be leveraged through various attack vectors including cross-site request forgery techniques, where an attacker might craft malicious requests that exploit the missing session validation. The vulnerability's impact extends beyond simple unauthorized access as it can potentially allow for privilege escalation, data manipulation, and unauthorized modifications to forum content. According to ATT&CK framework, this vulnerability maps to T1078 - Valid Accounts and T1566 - Phishing, as it can be exploited through session hijacking or by leveraging stolen session tokens to perform unauthorized actions within the application.
The operational impact of CVE-2006-6841 is significant for organizations relying on phpBB forums, as it creates a persistent security risk that can remain undetected for extended periods. The vulnerability's remote attack vector means that exploitation does not require local system access, making it particularly dangerous as attackers can target vulnerable installations from anywhere on the internet. This flaw essentially creates a backdoor for malicious actors to manipulate forum content, potentially leading to reputation damage, information disclosure, or the compromise of user data. The unknown impact mentioned in the original description reflects the broad range of potential consequences that can occur when session validation is bypassed, including but not limited to data corruption, unauthorized user account modifications, and potential escalation to full administrative control of the forum. Organizations running vulnerable versions of phpBB face substantial risk of being exploited for malicious purposes, including the distribution of spam content, phishing attacks, or the establishment of persistent access points within their network infrastructure.
The recommended mitigation strategy involves immediate upgrading to phpBB version 2.0.22 or later, which contains the necessary patches to address the missing session validation checks. System administrators should also implement additional monitoring and logging controls to detect unusual activity patterns that might indicate exploitation attempts. Network security controls including web application firewalls and intrusion detection systems should be configured to monitor for suspicious form submissions and session-related anomalies. Organizations should also conduct regular security assessments of their phpBB installations to ensure that all security patches are properly applied and that no custom modifications have introduced similar vulnerabilities. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software and implementing robust session management practices. According to security best practices and industry standards, this type of vulnerability should be addressed immediately through patch management procedures, as the window for exploitation remains open until the software is properly updated. Regular security audits and vulnerability assessments should be conducted to identify similar session validation issues in other applications and ensure that proper authentication controls are maintained throughout the entire application stack.